test_autoflake.py

#!/usr/bin/env python
"""Test suite for autoflake."""
import contextlib
import functools
import io
import os
import re
import shutil
import subprocess
import sys
import tempfile
import unittest
from argparse import Namespace

import autoflake


ROOT_DIRECTORY = os.path.abspath(os.path.dirname(__file__))


AUTOFLAKE_COMMAND = [
    sys.executable,
    os.path.join(
        ROOT_DIRECTORY,
        "autoflake.py",
    ),
]


class UnitTests(unittest.TestCase):

    """Unit tests."""

    def test_imports(self):
        self.assertGreater(len(autoflake.SAFE_IMPORTS), 0)

    def test_unused_import_line_numbers(self):
        self.assertEqual(
            [1],
            list(
                autoflake.unused_import_line_numbers(
                    autoflake.check("import os\n"),
                ),
            ),
        )

    def test_unused_import_line_numbers_with_from(self):
        self.assertEqual(
            [1],
            list(
                autoflake.unused_import_line_numbers(
                    autoflake.check("from os import path\n"),
                ),
            ),
        )

    def test_unused_import_line_numbers_with_dot(self):
        self.assertEqual(
            [1],
            list(
                autoflake.unused_import_line_numbers(
                    autoflake.check("import os.path\n"),
                ),
            ),
        )

    def test_extract_package_name(self):
        self.assertEqual("os", autoflake.extract_package_name("import os"))
        self.assertEqual(
            "os",
            autoflake.extract_package_name("from os import path"),
        )
        self.assertEqual(
            "os",
            autoflake.extract_package_name("import os.path"),
        )

    def test_extract_package_name_should_ignore_doctest_for_now(self):
        self.assertFalse(autoflake.extract_package_name(">>> import os"))

    def test_standard_package_names(self):
        self.assertIn("os", list(autoflake.standard_package_names()))
        self.assertIn("subprocess", list(autoflake.standard_package_names()))
        self.assertIn("urllib", list(autoflake.standard_package_names()))

        self.assertNotIn("autoflake", list(autoflake.standard_package_names()))
        self.assertNotIn("pep8", list(autoflake.standard_package_names()))

    def test_get_line_ending(self):
        self.assertEqual("\n", autoflake.get_line_ending("\n"))
        self.assertEqual("\n", autoflake.get_line_ending("abc\n"))
        self.assertEqual("\t  \t\n", autoflake.get_line_ending("abc\t  \t\n"))

        self.assertEqual("", autoflake.get_line_ending("abc"))
        self.assertEqual("", autoflake.get_line_ending(""))

    def test_get_indentation(self):
        self.assertEqual("", autoflake.get_indentation(""))
        self.assertEqual("    ", autoflake.get_indentation("    abc"))
        self.assertEqual("    ", autoflake.get_indentation("    abc  \n\t"))
        self.assertEqual("\t", autoflake.get_indentation("\tabc  \n\t"))
        self.assertEqual(" \t ", autoflake.get_indentation(" \t abc  \n\t"))
        self.assertEqual("", autoflake.get_indentation("    "))

    def test_filter_star_import(self):
        self.assertEqual(
            "from math import cos",
            autoflake.filter_star_import(
                "from math import *",
                ["cos"],
            ),
        )

        self.assertEqual(
            "from math import cos, sin",
            autoflake.filter_star_import(
                "from math import *",
                ["sin", "cos"],
            ),
        )

    def test_filter_unused_variable(self):
        self.assertEqual(
            "foo()",
            autoflake.filter_unused_variable("x = foo()"),
        )

        self.assertEqual(
            "    foo()",
            autoflake.filter_unused_variable("    x = foo()"),
        )

    def test_filter_unused_variable_with_literal_or_name(self):
        self.assertEqual(
            "pass",
            autoflake.filter_unused_variable("x = 1"),
        )

        self.assertEqual(
            "pass",
            autoflake.filter_unused_variable("x = y"),
        )

        self.assertEqual(
            "pass",
            autoflake.filter_unused_variable("x = {}"),
        )

    def test_filter_unused_variable_with_basic_data_structures(self):
        self.assertEqual(
            "pass",
            autoflake.filter_unused_variable("x = dict()"),
        )

        self.assertEqual(
            "pass",
            autoflake.filter_unused_variable("x = list()"),
        )

        self.assertEqual(
            "pass",
            autoflake.filter_unused_variable("x = set()"),
        )

    def test_filter_unused_variable_should_ignore_multiline(self):
        self.assertEqual(
            "x = foo()\\",
            autoflake.filter_unused_variable("x = foo()\\"),
        )

    def test_filter_unused_variable_should_multiple_assignments(self):
        self.assertEqual(
            "x = y = foo()",
            autoflake.filter_unused_variable("x = y = foo()"),
        )

    def test_filter_unused_variable_with_exception(self):
        self.assertEqual(
            "except Exception:",
            autoflake.filter_unused_variable("except Exception as exception:"),
        )

        self.assertEqual(
            "except (ImportError, ValueError):",
            autoflake.filter_unused_variable(
                "except (ImportError, ValueError) as foo:",
            ),
        )

    def test_filter_unused_variable_drop_rhs(self):
        self.assertEqual(
            "",
            autoflake.filter_unused_variable(
                "x = foo()",
                drop_rhs=True,
            ),
        )

        self.assertEqual(
            "",
            autoflake.filter_unused_variable(
                "    x = foo()",
                drop_rhs=True,
            ),
        )

    def test_filter_unused_variable_with_literal_or_name_drop_rhs(self):
        self.assertEqual(
            "pass",
            autoflake.filter_unused_variable("x = 1", drop_rhs=True),
        )

        self.assertEqual(
            "pass",
            autoflake.filter_unused_variable("x = y", drop_rhs=True),
        )

        self.assertEqual(
            "pass",
            autoflake.filter_unused_variable("x = {}", drop_rhs=True),
        )

    def test_filter_unused_variable_with_basic_data_structures_drop_rhs(self):
        self.assertEqual(
            "pass",
            autoflake.filter_unused_variable("x = dict()", drop_rhs=True),
        )

        self.assertEqual(
            "pass",
            autoflake.filter_unused_variable("x = list()", drop_rhs=True),
        )

        self.assertEqual(
            "pass",
            autoflake.filter_unused_variable("x = set()", drop_rhs=True),
        )

    def test_filter_unused_variable_should_ignore_multiline_drop_rhs(self):
        self.assertEqual(
            "x = foo()\\",
            autoflake.filter_unused_variable("x = foo()\\", drop_rhs=True),
        )

    def test_filter_unused_variable_should_multiple_assignments_drop_rhs(self):
        self.assertEqual(
            "x = y = foo()",
            autoflake.filter_unused_variable("x = y = foo()", drop_rhs=True),
        )

    def test_filter_unused_variable_with_exception_drop_rhs(self):
        self.assertEqual(
            "except Exception:",
            autoflake.filter_unused_variable(
                "except Exception as exception:",
                drop_rhs=True,
            ),
        )

        self.assertEqual(
            "except (ImportError, ValueError):",
            autoflake.filter_unused_variable(
                "except (ImportError, ValueError) as foo:",
                drop_rhs=True,
            ),
        )

    def test_filter_code(self):
        self.assertEqual(
            """\
import os
pass
os.foo()
""",
            "".join(
                autoflake.filter_code(
                    """\
import os
import re
os.foo()
""",
                ),
            ),
        )

    def test_filter_code_with_indented_import(self):
        self.assertEqual(
            """\
import os
if True:
    pass
os.foo()
""",
            "".join(
                autoflake.filter_code(
                    """\
import os
if True:
    import re
os.foo()
""",
                ),
            ),
        )

    def test_filter_code_with_from(self):
        self.assertEqual(
            """\
pass
x = 1
""",
            "".join(
                autoflake.filter_code(
                    """\
from os import path
x = 1
""",
                ),
            ),
        )

    def test_filter_code_with_not_from(self):
        self.assertEqual(
            """\
pass
x = 1
""",
            "".join(
                autoflake.filter_code(
                    """\
import frommer
x = 1
""",
                    remove_all_unused_imports=True,
                ),
            ),
        )

    def test_filter_code_with_used_from(self):
        self.assertEqual(
            """\
import frommer
print(frommer)
""",
            "".join(
                autoflake.filter_code(
                    """\
import frommer
print(frommer)
""",
                    remove_all_unused_imports=True,
                ),
            ),
        )

    def test_filter_code_with_ambiguous_from(self):
        self.assertEqual(
            """\
pass
""",
            "".join(
                autoflake.filter_code(
                    """\
from frommer import abc, frommer, xyz
""",
                    remove_all_unused_imports=True,
                ),
            ),
        )

    def test_filter_code_should_avoid_inline_except(self):
        line = """\
try: from zap import foo
except: from zap import bar
"""
        self.assertEqual(
            line,
            "".join(
                autoflake.filter_code(
                    line,
                    remove_all_unused_imports=True,
                ),
            ),
        )

    def test_filter_code_should_avoid_escaped_newlines(self):
        line = """\
try:\\
from zap import foo
except:\\
from zap import bar
"""
        self.assertEqual(
            line,
            "".join(
                autoflake.filter_code(
                    line,
                    remove_all_unused_imports=True,
                ),
            ),
        )

    def test_filter_code_with_remove_all_unused_imports(self):
        self.assertEqual(
            """\
pass
pass
x = 1
""",
            "".join(
                autoflake.filter_code(
                    """\
import foo
import zap
x = 1
""",
                    remove_all_unused_imports=True,
                ),
            ),
        )

    def test_filter_code_with_additional_imports(self):
        self.assertEqual(
            """\
pass
import zap
x = 1
""",
            "".join(
                autoflake.filter_code(
                    """\
import foo
import zap
x = 1
""",
                    additional_imports=["foo", "bar"],
                ),
            ),
        )

    def test_filter_code_should_ignore_imports_with_inline_comment(self):
        self.assertEqual(
            """\
from os import path  # foo
pass
from fake_foo import z  # foo, foo, zap
x = 1
""",
            "".join(
                autoflake.filter_code(
                    """\
from os import path  # foo
from os import path
from fake_foo import z  # foo, foo, zap
x = 1
""",
                ),
            ),
        )

    def test_filter_code_should_respect_noqa(self):
        self.assertEqual(
            """\
pass
import re  # noqa
from subprocess import Popen  # NOQA
x = 1
""",
            "".join(
                autoflake.filter_code(
                    """\
from os import path
import re  # noqa
from subprocess import Popen  # NOQA
x = 1
""",
                ),
            ),
        )

    def test_filter_code_expand_star_imports(self):
        self.assertEqual(
            """\
from math import sin
sin(1)
""",
            "".join(
                autoflake.filter_code(
                    """\
from math import *
sin(1)
""",
                    expand_star_imports=True,
                ),
            ),
        )

        self.assertEqual(
            """\
from math import cos, sin
sin(1)
cos(1)
""",
            "".join(
                autoflake.filter_code(
                    """\
from math import *
sin(1)
cos(1)
""",
                    expand_star_imports=True,
                ),
            ),
        )

    def test_filter_code_ignore_multiple_star_import(self):
        self.assertEqual(
            """\
from math import *
from re import *
sin(1)
cos(1)
""",
            "".join(
                autoflake.filter_code(
                    """\
from math import *
from re import *
sin(1)
cos(1)
""",
                    expand_star_imports=True,
                ),
            ),
        )

    def test_filter_code_with_special_re_symbols_in_key(self):
        self.assertEqual(
            """\
a = {
  '????': 2,
}
print(a)
""",
            "".join(
                autoflake.filter_code(
                    """\
a = {
  '????': 3,
  '????': 2,
}
print(a)
""",
                    remove_duplicate_keys=True,
                ),
            ),
        )

    def test_multiline_import(self):
        self.assertTrue(
            autoflake.multiline_import(
                r"""\
import os, \
    math, subprocess
""",
            ),
        )

        self.assertFalse(
            autoflake.multiline_import(
                """\
import os, math, subprocess
""",
            ),
        )

        self.assertTrue(
            autoflake.multiline_import(
                """\
import os, math, subprocess
""",
                previous_line="if: \\\n",
            ),
        )

        self.assertTrue(
            autoflake.multiline_import("from os import (path, sep)"),
        )

    def test_multiline_statement(self):
        self.assertFalse(autoflake.multiline_statement("x = foo()"))

        self.assertTrue(autoflake.multiline_statement("x = 1;"))
        self.assertTrue(autoflake.multiline_statement("import os, \\"))
        self.assertTrue(autoflake.multiline_statement("foo("))
        self.assertTrue(
            autoflake.multiline_statement(
                "1",
                previous_line="x = \\",
            ),
        )

    def test_break_up_import(self):
        self.assertEqual(
            "import abc\nimport math\nimport subprocess\n",
            autoflake.break_up_import("import abc, subprocess, math\n"),
        )

    def test_break_up_import_with_indentation(self):
        self.assertEqual(
            "    import abc\n    import math\n    import subprocess\n",
            autoflake.break_up_import("    import abc, subprocess, math\n"),
        )

    def test_break_up_import_should_do_nothing_on_no_line_ending(self):
        self.assertEqual(
            "import abc, subprocess, math",
            autoflake.break_up_import("import abc, subprocess, math"),
        )

    def test_filter_from_import_no_remove(self):
        self.assertEqual(
            """\
    from foo import abc, math, subprocess\n""",
            autoflake.filter_from_import(
                "    from foo import abc, subprocess, math\n",
                unused_module=[],
            ),
        )

    def test_filter_from_import_remove_module(self):
        self.assertEqual(
            """\
    from foo import math, subprocess\n""",
            autoflake.filter_from_import(
                "    from foo import abc, subprocess, math\n",
                unused_module=["foo.abc"],
            ),
        )

    def test_filter_from_import_remove_all(self):
        self.assertEqual(
            "    pass\n",
            autoflake.filter_from_import(
                "    from foo import abc, subprocess, math\n",
                unused_module=[
                    "foo.abc",
                    "foo.subprocess",
                    "foo.math",
                ],
            ),
        )

    def test_filter_code_multiline_imports(self):
        self.assertEqual(
            r"""\
import os
pass
import os
os.foo()
""",
            "".join(
                autoflake.filter_code(
                    r"""\
import os
import re
import os, \
    math, subprocess
os.foo()
""",
                ),
            ),
        )

    def test_filter_code_multiline_from_imports(self):
        self.assertEqual(
            r"""\
import os
pass
from os.path import (
    join,
)
join('a', 'b')
pass
os.foo()
from os.path import \
    isdir
isdir('42')
""",
            "".join(
                autoflake.filter_code(
                    r"""\
import os
import re
from os.path import (
    exists,
    join,
)
join('a', 'b')
from os.path import \
    abspath, basename, \
    commonpath
os.foo()
from os.path import \
    isfile \
    , isdir
isdir('42')
""",
                ),
            ),
        )

    def test_filter_code_should_ignore_semicolons(self):
        self.assertEqual(
            r"""\
import os
pass
import os; import math, subprocess
os.foo()
""",
            "".join(
                autoflake.filter_code(
                    r"""\
import os
import re
import os; import math, subprocess
os.foo()
""",
                ),
            ),
        )

    def test_filter_code_should_ignore_non_standard_library(self):
        self.assertEqual(
            """\
import os
import my_own_module
pass
from my_package import another_module
from my_package import subprocess
from my_blah.my_blah_blah import blah
os.foo()
""",
            "".join(
                autoflake.filter_code(
                    """\
import os
import my_own_module
import re
from my_package import another_module
from my_package import subprocess
from my_blah.my_blah_blah import blah
os.foo()
""",
                ),
            ),
        )

    def test_filter_code_should_ignore_unsafe_imports(self):
        self.assertEqual(
            """\
import rlcompleter
pass
pass
pass
print(1)
""",
            "".join(
                autoflake.filter_code(
                    """\
import rlcompleter
import sys
import io
import os
print(1)
""",
                ),
            ),
        )

    def test_filter_code_should_ignore_docstring(self):
        line = """
def foo():
    '''
    >>> import math
    '''
"""
        self.assertEqual(line, "".join(autoflake.filter_code(line)))

    def test_with_ignore_init_module_imports_flag(self):
        # Need a temp directory in order to specify file name as __init__.py
        temp_directory = tempfile.mkdtemp(dir=".")
        temp_file = os.path.join(temp_directory, "__init__.py")
        try:
            with open(temp_file, "w") as output:
                output.write("import re\n")

            p = subprocess.Popen(
                list(AUTOFLAKE_COMMAND) + ["--ignore-init-module-imports", temp_file],
                stdout=subprocess.PIPE,
            )
            result = p.communicate()[0].decode("utf-8")

            self.assertNotIn("import re", result)
        finally:
            shutil.rmtree(temp_directory)

    def test_without_ignore_init_module_imports_flag(self):
        # Need a temp directory in order to specify file name as __init__.py
        temp_directory = tempfile.mkdtemp(dir=".")
        temp_file = os.path.join(temp_directory, "__init__.py")
        try:
            with open(temp_file, "w") as output:
                output.write("import re\n")

            p = subprocess.Popen(
                list(AUTOFLAKE_COMMAND) + [temp_file],
                stdout=subprocess.PIPE,
            )
            result = p.communicate()[0].decode("utf-8")

            self.assertIn("import re", result)
        finally:
            shutil.rmtree(temp_directory)

    def test_fix_code(self):
        self.assertEqual(
            """\
import os
import math
from sys import version
os.foo()
math.pi
x = version
""",
            autoflake.fix_code(
                """\
import os
import re
import abc, math, subprocess
from sys import exit, version
os.foo()
math.pi
x = version
""",
            ),
        )

    def test_fix_code_with_from_and_as(self):
        self.assertEqual(
            """\
from collections import namedtuple as xyz
xyz
""",
            autoflake.fix_code(
                """\
from collections import defaultdict, namedtuple as xyz
xyz
""",
            ),
        )

        self.assertEqual(
            """\
from collections import namedtuple as xyz
xyz
""",
            autoflake.fix_code(
                """\
from collections import defaultdict as abc, namedtuple as xyz
xyz
""",
            ),
        )

        self.assertEqual(
            """\
from collections import namedtuple
namedtuple
""",
            autoflake.fix_code(
                """\
from collections import defaultdict as abc, namedtuple
namedtuple
""",
            ),
        )

        self.assertEqual(
            """\
""",
            autoflake.fix_code(
                """\
from collections import defaultdict as abc, namedtuple as xyz
""",
            ),
        )

    def test_fix_code_with_from_with_and_without_remove_all(self):
        code = """\
from x import a as b, c as d
"""

        self.assertEqual(
            """\
""",
            autoflake.fix_code(code, remove_all_unused_imports=True),
        )

        self.assertEqual(
            code,
            autoflake.fix_code(code, remove_all_unused_imports=False),
        )

    def test_fix_code_with_from_and_depth_module(self):
        self.assertEqual(
            """\
from distutils.version import StrictVersion
StrictVersion('1.0.0')
""",
            autoflake.fix_code(
                """\
from distutils.version import LooseVersion, StrictVersion
StrictVersion('1.0.0')
""",
            ),
        )

        self.assertEqual(
            """\
from distutils.version import StrictVersion as version
version('1.0.0')
""",
            autoflake.fix_code(
                """\
from distutils.version import LooseVersion, StrictVersion as version
version('1.0.0')
""",
            ),
        )

    def test_fix_code_with_indented_from(self):
        self.assertEqual(
            """\
def z():
    from ctypes import POINTER, byref
    POINTER, byref
    """,
            autoflake.fix_code(
                """\
def z():
    from ctypes import c_short, c_uint, c_int, c_long, pointer, POINTER, byref
    POINTER, byref
    """,
            ),
        )

        self.assertEqual(
            """\
def z():
    pass
""",
            autoflake.fix_code(
                """\
def z():
    from ctypes import c_short, c_uint, c_int, c_long, pointer, POINTER, byref
""",
            ),
        )

    def test_fix_code_with_empty_string(self):
        self.assertEqual(
            "",
            autoflake.fix_code(""),
        )

    def test_fix_code_with_from_and_as_and_escaped_newline(self):
        """Make sure stuff after escaped newline is not lost."""
        result = autoflake.fix_code(
            """\
from collections import defaultdict, namedtuple \\
    as xyz
xyz
""",
        )
        # We currently leave lines with escaped newlines as is. But in the
        # future this we may parse them and remove unused import accordingly.
        # For now, we'll work around it here.
        result = re.sub(r" *\\\n *as ", " as ", result)

        self.assertEqual(
            """\
from collections import namedtuple as xyz
xyz
""",
            autoflake.fix_code(result),
        )

    def test_fix_code_with_unused_variables(self):
        self.assertEqual(
            """\
def main():
    y = 11
    print(y)
""",
            autoflake.fix_code(
                """\
def main():
    x = 10
    y = 11
    print(y)
""",
                remove_unused_variables=True,
            ),
        )

    def test_fix_code_with_unused_variables_drop_rhs(self):
        self.assertEqual(
            """\
def main():
    y = 11
    print(y)
""",
            autoflake.fix_code(
                """\
def main():
    x = 10
    y = 11
    print(y)
""",
                remove_unused_variables=True,
                remove_rhs_for_unused_variables=True,
            ),
        )

    def test_fix_code_with_unused_variables_should_skip_nonlocal(self):
        """pyflakes does not handle nonlocal correctly."""
        code = """\
def bar():
    x = 1

    def foo():
        nonlocal x
        x = 2
"""
        self.assertEqual(
            code,
            autoflake.fix_code(
                code,
                remove_unused_variables=True,
            ),
        )

    def test_fix_code_with_unused_variables_should_skip_nonlocal_drop_rhs(
        self,
    ):
        """pyflakes does not handle nonlocal correctly."""
        code = """\
def bar():
    x = 1

    def foo():
        nonlocal x
        x = 2
"""
        self.assertEqual(
            code,
            autoflake.fix_code(
                code,
                remove_unused_variables=True,
                remove_rhs_for_unused_variables=True,
            ),
        )

    def test_detect_encoding_with_bad_encoding(self):
        with temporary_file("# -*- coding: blah -*-\n") as filename:
            self.assertEqual(
                "latin-1",
                autoflake.detect_encoding(filename),
            )

    def test_fix_code_with_comma_on_right(self):
        """pyflakes does not handle nonlocal correctly."""
        self.assertEqual(
            """\
def main():
    pass
""",
            autoflake.fix_code(
                """\
def main():
    x = (1, 2, 3)
""",
                remove_unused_variables=True,
            ),
        )

    def test_fix_code_with_comma_on_right_drop_rhs(self):
        """pyflakes does not handle nonlocal correctly."""
        self.assertEqual(
            """\
def main():
    pass
""",
            autoflake.fix_code(
                """\
def main():
    x = (1, 2, 3)
""",
                remove_unused_variables=True,
                remove_rhs_for_unused_variables=True,
            ),
        )

    def test_fix_code_with_unused_variables_should_skip_multiple(self):
        code = """\
def main():
    (x, y, z) = (1, 2, 3)
    print(z)
"""
        self.assertEqual(
            code,
            autoflake.fix_code(
                code,
                remove_unused_variables=True,
            ),
        )

    def test_fix_code_with_unused_variables_should_skip_multiple_drop_rhs(
        self,
    ):
        code = """\
def main():
    (x, y, z) = (1, 2, 3)
    print(z)
"""
        self.assertEqual(
            code,
            autoflake.fix_code(
                code,
                remove_unused_variables=True,
                remove_rhs_for_unused_variables=True,
            ),
        )

    def test_fix_code_should_handle_pyflakes_recursion_error_gracefully(self):
        code = "x = [{}]".format("+".join(["abc" for _ in range(2000)]))
        self.assertEqual(
            code,
            autoflake.fix_code(code),
        )

    def test_fix_code_with_duplicate_key(self):
        self.assertEqual(
            """\
a = {
  (0,1): 3,
}
print(a)
""",
            "".join(
                autoflake.fix_code(
                    """\
a = {
  (0,1): 1,
  (0, 1): 'two',
  (0,1): 3,
}
print(a)
""",
                    remove_duplicate_keys=True,
                ),
            ),
        )

    def test_fix_code_with_duplicate_key_longer(self):
        self.assertEqual(
            """\
{
    'a': 0,
    'c': 2,
    'd': 3,
    'e': 4,
    'f': 5,
    'b': 6,
}
""",
            "".join(
                autoflake.fix_code(
                    """\
{
    'a': 0,
    'b': 1,
    'c': 2,
    'd': 3,
    'e': 4,
    'f': 5,
    'b': 6,
}
""",
                    remove_duplicate_keys=True,
                ),
            ),
        )

    def test_fix_code_with_duplicate_key_with_many_braces(self):
        self.assertEqual(
            """\
a = None

{None: {None: None},
 }

{
    None: a.b,
}
""",
            "".join(
                autoflake.fix_code(
                    """\
a = None

{None: {None: None},
 }

{
    None: a.a,
    None: a.b,
}
""",
                    remove_duplicate_keys=True,
                ),
            ),
        )

    def test_fix_code_should_ignore_complex_case_of_duplicate_key(self):
        """We only handle simple cases."""
        code = """\
a = {(0,1): 1, (0, 1): 'two',
  (0,1): 3,
}
print(a)
"""

        self.assertEqual(
            code,
            "".join(
                autoflake.fix_code(
                    code,
                    remove_duplicate_keys=True,
                ),
            ),
        )

    def test_fix_code_should_ignore_complex_case_of_duplicate_key_comma(self):
        """We only handle simple cases."""
        code = """\
{
    1: {0,
    },
    1: {2,
    },
}
"""

        self.assertEqual(
            code,
            "".join(
                autoflake.fix_code(
                    code,
                    remove_duplicate_keys=True,
                ),
            ),
        )

    def test_fix_code_should_ignore_complex_case_of_duplicate_key_partially(
        self,
    ):
        """We only handle simple cases."""
        code = """\
a = {(0,1): 1, (0, 1): 'two',
  (0,1): 3,
  (2,3): 4,
  (2,3): 4,
  (2,3): 5,
}
print(a)
"""

        self.assertEqual(
            """\
a = {(0,1): 1, (0, 1): 'two',
  (0,1): 3,
  (2,3): 5,
}
print(a)
""",
            "".join(
                autoflake.fix_code(
                    code,
                    remove_duplicate_keys=True,
                ),
            ),
        )

    def test_fix_code_should_ignore_more_cases_of_duplicate_key(self):
        """We only handle simple cases."""
        code = """\
a = {
    (0,1):
    1,
    (0, 1): 'two',
  (0,1): 3,
}
print(a)
"""

        self.assertEqual(
            code,
            "".join(
                autoflake.fix_code(
                    code,
                    remove_duplicate_keys=True,
                ),
            ),
        )

    def test_fix_code_should_ignore_duplicate_key_with_comments(self):
        """We only handle simple cases."""
        code = """\
a = {
    (0,1)  # : f
    :
    1,
    (0, 1): 'two',
  (0,1): 3,
}
print(a)
"""

        self.assertEqual(
            code,
            "".join(
                autoflake.fix_code(
                    code,
                    remove_duplicate_keys=True,
                ),
            ),
        )

        code = """\
{
    1: {0,
    },
    1: #{2,
    #},
    0
}
"""

        self.assertEqual(
            code,
            "".join(
                autoflake.fix_code(
                    code,
                    remove_duplicate_keys=True,
                ),
            ),
        )

    def test_fix_code_should_ignore_duplicate_key_with_multiline_key(self):
        """We only handle simple cases."""
        code = """\
a = {
    (0,1
    ): 1,
    (0, 1): 'two',
  (0,1): 3,
}
print(a)
"""

        self.assertEqual(
            code,
            "".join(
                autoflake.fix_code(
                    code,
                    remove_duplicate_keys=True,
                ),
            ),
        )

    def test_fix_code_should_ignore_duplicate_key_with_no_comma(self):
        """We don't want to delete the line and leave a lone comma."""
        code = """\
a = {
    (0,1) : 1
    ,
    (0, 1): 'two',
  (0,1): 3,
}
print(a)
"""

        self.assertEqual(
            code,
            "".join(
                autoflake.fix_code(
                    code,
                    remove_duplicate_keys=True,
                ),
            ),
        )

    def test_fix_code_keeps_pass_statements(self):
        code = """\
    if True:
        pass
    else:
        def foo():
            \"\"\" A docstring. \"\"\"
            pass
        def bar():
            # abc
            pass
        def blah():
            123
            pass
            pass  # Nope.
            pass
    """

        self.assertEqual(
            code,
            "".join(
                autoflake.fix_code(
                    code,
                    ignore_pass_statements=True,
                ),
            ),
        )

    def test_fix_code_keeps_passes_after_docstrings(self):
        actual = autoflake.fix_code(
            """\
    if True:
        pass
    else:
        def foo():
            \"\"\" A docstring. \"\"\"
            pass
        def bar():
            # abc
            pass
        def blah():
            123
            pass
            pass  # Nope.
            pass
    """,
            ignore_pass_after_docstring=True,
        )

        expected = """\
    if True:
        pass
    else:
        def foo():
            \"\"\" A docstring. \"\"\"
            pass
        def bar():
            # abc
            pass
        def blah():
            123
            pass  # Nope.
    """

        self.assertEqual(actual, expected)

    def test_useless_pass_line_numbers(self):
        self.assertEqual(
            [1],
            list(
                autoflake.useless_pass_line_numbers(
                    "pass\n",
                ),
            ),
        )

        self.assertEqual(
            [],
            list(
                autoflake.useless_pass_line_numbers(
                    "if True:\n    pass\n",
                ),
            ),
        )

    def test_useless_pass_line_numbers_with_escaped_newline(self):
        self.assertEqual(
            [],
            list(
                autoflake.useless_pass_line_numbers(
                    "if True:\\\n    pass\n",
                ),
            ),
        )

    def test_useless_pass_line_numbers_with_more_complex(self):
        self.assertEqual(
            [6],
            list(
                autoflake.useless_pass_line_numbers(
                    """\
if True:
    pass
else:
    True
    x = 1
    pass
""",
                ),
            ),
        )

    def test_useless_pass_line_numbers_after_docstring(self):
        actual_pass_line_numbers = list(
            autoflake.useless_pass_line_numbers(
                """\
    @abc.abstractmethod
    def some_abstract_method():
        \"\"\"Some docstring.\"\"\"
        pass
    """,
            ),
        )

        expected_pass_line_numbers = [4]
        self.assertEqual(expected_pass_line_numbers, actual_pass_line_numbers)

    def test_useless_pass_line_numbers_keep_pass_after_docstring(self):
        actual_pass_line_numbers = list(
            autoflake.useless_pass_line_numbers(
                """\
    @abc.abstractmethod
    def some_abstract_method():
        \"\"\"Some docstring.\"\"\"
        pass
    """,
                ignore_pass_after_docstring=True,
            ),
        )

        expected_pass_line_numbers = []
        self.assertEqual(expected_pass_line_numbers, actual_pass_line_numbers)

    def test_filter_useless_pass(self):
        self.assertEqual(
            """\
if True:
    pass
else:
    True
    x = 1
""",
            "".join(
                autoflake.filter_useless_pass(
                    """\
if True:
    pass
else:
    True
    x = 1
    pass
""",
                ),
            ),
        )

    def test_filter_useless_pass_with_syntax_error(self):
        source = """\
if True:
if True:
            if True:
    if True:

if True:
    pass
else:
    True
    pass
    pass
    x = 1
"""

        self.assertEqual(
            source,
            "".join(autoflake.filter_useless_pass(source)),
        )

    def test_filter_useless_pass_more_complex(self):
        self.assertEqual(
            """\
if True:
    pass
else:
    def foo():
        pass
        # abc
    def bar():
        # abc
        pass
    def blah():
        123
        pass  # Nope.
    True
    x = 1
""",
            "".join(
                autoflake.filter_useless_pass(
                    """\
if True:
    pass
else:
    def foo():
        pass
        # abc
    def bar():
        # abc
        pass
    def blah():
        123
        pass
        pass  # Nope.
        pass
    True
    x = 1
    pass
""",
                ),
            ),
        )

    def test_filter_useless_pass_keep_pass_after_docstring(self):
        source = """\
    def foo():
        \"\"\" This is not a useless 'pass'. \"\"\"
        pass

    @abc.abstractmethod
    def bar():
        \"\"\"
            Also this is not a useless 'pass'.
        \"\"\"
        pass
    """
        self.assertEqual(
            source,
            "".join(
                autoflake.filter_useless_pass(
                    source,
                    ignore_pass_after_docstring=True,
                ),
            ),
        )

    def test_filter_useless_pass_keeps_pass_statements(self):
        source = """\
    if True:
        pass
        pass
        pass
        pass
    else:
        pass
        True
        x = 1
        pass
    """

        self.assertEqual(
            source,
            "".join(
                autoflake.filter_useless_pass(
                    source,
                    ignore_pass_statements=True,
                ),
            ),
        )

    def test_filter_useless_paspasss_with_try(self):
        self.assertEqual(
            """\
import os
os.foo()
try:
    pass
except ImportError:
    pass
""",
            "".join(
                autoflake.filter_useless_pass(
                    """\
import os
os.foo()
try:
    pass
    pass
except ImportError:
    pass
""",
                ),
            ),
        )

    def test_filter_useless_pass_leading_pass(self):
        self.assertEqual(
            """\
if True:
    pass
else:
    True
    x = 1
""",
            "".join(
                autoflake.filter_useless_pass(
                    """\
if True:
    pass
    pass
    pass
    pass
else:
    pass
    True
    x = 1
    pass
""",
                ),
            ),
        )

    def test_filter_useless_pass_leading_pass_with_number(self):
        self.assertEqual(
            """\
def func11():
    0, 11 / 2
    return 1
""",
            "".join(
                autoflake.filter_useless_pass(
                    """\
def func11():
    pass
    0, 11 / 2
    return 1
""",
                ),
            ),
        )

    def test_filter_useless_pass_leading_pass_with_string(self):
        self.assertEqual(
            """\
def func11():
    'hello'
    return 1
""",
            "".join(
                autoflake.filter_useless_pass(
                    """\
def func11():
    pass
    'hello'
    return 1
""",
                ),
            ),
        )

    def test_check(self):
        self.assertTrue(autoflake.check("import os"))

    def test_check_with_bad_syntax(self):
        self.assertFalse(autoflake.check("foo("))

    def test_check_with_unicode(self):
        self.assertFalse(autoflake.check('print("∑")'))

        self.assertTrue(autoflake.check("import os  # ∑"))

    def test_get_diff_text(self):
        # We ignore the first two lines since it differs on Python 2.6.
        self.assertEqual(
            """\
-foo
+bar
""",
            "\n".join(
                autoflake.get_diff_text(["foo\n"], ["bar\n"], "").split(
                    "\n",
                )[3:],
            ),
        )

    def test_get_diff_text_without_newline(self):
        # We ignore the first two lines since it differs on Python 2.6.
        self.assertEqual(
            """\
-foo
\\ No newline at end of file
+foo
""",
            "\n".join(
                autoflake.get_diff_text(["foo"], ["foo\n"], "").split(
                    "\n",
                )[3:],
            ),
        )

    def test_is_literal_or_name(self):
        self.assertTrue(autoflake.is_literal_or_name("123"))
        self.assertTrue(autoflake.is_literal_or_name("[1, 2, 3]"))
        self.assertTrue(autoflake.is_literal_or_name("xyz"))

        self.assertFalse(autoflake.is_literal_or_name("xyz.prop"))
        self.assertFalse(autoflake.is_literal_or_name(" "))

    def test_is_python_file(self):
        self.assertTrue(
            autoflake.is_python_file(
                os.path.join(ROOT_DIRECTORY, "autoflake.py"),
            ),
        )

        with temporary_file("#!/usr/bin/env python", suffix="") as filename:
            self.assertTrue(autoflake.is_python_file(filename))

        with temporary_file("#!/usr/bin/python", suffix="") as filename:
            self.assertTrue(autoflake.is_python_file(filename))

        with temporary_file("#!/usr/bin/python3", suffix="") as filename:
            self.assertTrue(autoflake.is_python_file(filename))

        with temporary_file("#!/usr/bin/pythonic", suffix="") as filename:
            self.assertFalse(autoflake.is_python_file(filename))

        with temporary_file("###!/usr/bin/python", suffix="") as filename:
            self.assertFalse(autoflake.is_python_file(filename))

        self.assertFalse(autoflake.is_python_file(os.devnull))
        self.assertFalse(autoflake.is_python_file("/bin/bash"))

    def test_is_exclude_file(self):
        self.assertTrue(
            autoflake.is_exclude_file(
                "1.py",
                ["test*", "1*"],
            ),
        )

        self.assertFalse(
            autoflake.is_exclude_file(
                "2.py",
                ["test*", "1*"],
            ),
        )

        # folder glob
        self.assertTrue(
            autoflake.is_exclude_file(
                "test/test.py",
                ["test/**.py"],
            ),
        )

        self.assertTrue(
            autoflake.is_exclude_file(
                "test/auto_test.py",
                ["test/*_test.py"],
            ),
        )

        self.assertFalse(
            autoflake.is_exclude_file(
                "test/auto_auto.py",
                ["test/*_test.py"],
            ),
        )

    def test_match_file(self):
        with temporary_file("", suffix=".py", prefix=".") as filename:
            self.assertFalse(
                autoflake.match_file(filename, exclude=[]),
                msg=filename,
            )

        self.assertFalse(autoflake.match_file(os.devnull, exclude=[]))

        with temporary_file("", suffix=".py", prefix="") as filename:
            self.assertTrue(
                autoflake.match_file(filename, exclude=[]),
                msg=filename,
            )

    def test_find_files(self):
        temp_directory = tempfile.mkdtemp()
        try:
            target = os.path.join(temp_directory, "dir")
            os.mkdir(target)
            with open(os.path.join(target, "a.py"), "w"):
                pass

            exclude = os.path.join(target, "ex")
            os.mkdir(exclude)
            with open(os.path.join(exclude, "b.py"), "w"):
                pass

            sub = os.path.join(exclude, "sub")
            os.mkdir(sub)
            with open(os.path.join(sub, "c.py"), "w"):
                pass

            # FIXME: Avoid changing directory. This may interfere with parallel
            # test runs.
            cwd = os.getcwd()
            os.chdir(temp_directory)
            try:
                files = list(
                    autoflake.find_files(
                        ["dir"],
                        True,
                        [os.path.join("dir", "ex")],
                    ),
                )
            finally:
                os.chdir(cwd)

            file_names = [os.path.basename(f) for f in files]
            self.assertIn("a.py", file_names)
            self.assertNotIn("b.py", file_names)
            self.assertNotIn("c.py", file_names)
        finally:
            shutil.rmtree(temp_directory)

    def test_exclude(self):
        temp_directory = tempfile.mkdtemp(dir=".")
        try:
            with open(os.path.join(temp_directory, "a.py"), "w") as output:
                output.write("import re\n")

            os.mkdir(os.path.join(temp_directory, "d"))
            with open(
                os.path.join(temp_directory, "d", "b.py"),
                "w",
            ) as output:
                output.write("import os\n")

            p = subprocess.Popen(
                list(AUTOFLAKE_COMMAND)
                + [temp_directory, "--recursive", "--exclude=a*"],
                stdout=subprocess.PIPE,
            )
            result = p.communicate()[0].decode("utf-8")

            self.assertNotIn("import re", result)
            self.assertIn("import os", result)
        finally:
            shutil.rmtree(temp_directory)


class SystemTests(unittest.TestCase):

    """System tests."""

    def test_diff(self):
        with temporary_file(
            """\
import re
import os
import my_own_module
x = 1
""",
        ) as filename:
            output_file = io.StringIO()
            autoflake._main(
                argv=["my_fake_program", filename],
                standard_out=output_file,
                standard_error=None,
            )
            self.assertEqual(
                """\
-import re
-import os
 import my_own_module
 x = 1
""",
                "\n".join(output_file.getvalue().split("\n")[3:]),
            )

    def test_diff_with_nonexistent_file(self):
        output_file = io.StringIO()
        autoflake._main(
            argv=["my_fake_program", "nonexistent_file"],
            standard_out=output_file,
            standard_error=output_file,
        )
        self.assertIn("no such file", output_file.getvalue().lower())

    def test_diff_with_encoding_declaration(self):
        with temporary_file(
            """\
# coding: iso-8859-1
import re
import os
import my_own_module
x = 1
""",
        ) as filename:
            output_file = io.StringIO()
            autoflake._main(
                argv=["my_fake_program", filename],
                standard_out=output_file,
                standard_error=None,
            )
            self.assertEqual(
                """\
 # coding: iso-8859-1
-import re
-import os
 import my_own_module
 x = 1
""",
                "\n".join(output_file.getvalue().split("\n")[3:]),
            )

    def test_in_place(self):
        with temporary_file(
            """\
import foo
x = foo
import subprocess
x()

try:
    import os
except ImportError:
    import os
""",
        ) as filename:
            output_file = io.StringIO()
            autoflake._main(
                argv=["my_fake_program", "--in-place", filename],
                standard_out=output_file,
                standard_error=None,
            )
            with open(filename) as f:
                self.assertEqual(
                    """\
import foo
x = foo
x()

try:
    pass
except ImportError:
    pass
""",
                    f.read(),
                )

    def test_check_with_empty_file(self):
        line = ""

        with temporary_file(line) as filename:
            output_file = io.StringIO()
            autoflake._main(
                argv=["my_fake_program", "--check", filename],
                standard_out=output_file,
                standard_error=None,
            )
            self.assertEqual(
                f"{filename}: No issues detected!{os.linesep}",
                output_file.getvalue(),
            )

    def test_check_correct_file(self):
        with temporary_file(
            """\
import foo
x = foo.bar
print(x)
""",
        ) as filename:
            output_file = io.StringIO()
            autoflake._main(
                argv=["my_fake_program", "--check", filename],
                standard_out=output_file,
                standard_error=None,
            )
            self.assertEqual(
                f"{filename}: No issues detected!{os.linesep}",
                output_file.getvalue(),
            )

    def test_check_correct_file_with_quiet(self):
        with temporary_file(
            """\
import foo
x = foo.bar
print(x)
""",
        ) as filename:
            output_file = io.StringIO()
            autoflake._main(
                argv=[
                    "my_fake_program",
                    "--check",
                    "--quiet",
                    filename,
                ],
                standard_out=output_file,
                standard_error=None,
            )
            self.assertEqual("", output_file.getvalue())

    def test_check_useless_pass(self):
        with temporary_file(
            """\
import foo
x = foo
import subprocess
x()

try:
    pass
    import os
except ImportError:
    pass
    import os
    import sys
""",
        ) as filename:
            output_file = io.StringIO()
            exit_status = autoflake._main(
                argv=["my_fake_program", "--check", filename],
                standard_out=output_file,
                standard_error=None,
            )
            self.assertEqual(exit_status, 1)
            self.assertEqual(
                f"{filename}: Unused imports/variables detected{os.linesep}",
                output_file.getvalue(),
            )

    def test_check_with_multiple_files(self):
        with temporary_file("import sys") as file1:
            with temporary_file("import sys") as file2:
                output_file = io.StringIO()
                exit_status = autoflake._main(
                    argv=["my_fake_program", "--check", file1, file2],
                    standard_out=output_file,
                    standard_error=None,
                )
                self.assertEqual(exit_status, 1)
                self.assertEqual(
                    {
                        f"{file1}: Unused imports/variables detected",
                        f"{file2}: Unused imports/variables detected",
                    },
                    set(output_file.getvalue().strip().split(os.linesep)),
                )

    def test_in_place_with_empty_file(self):
        line = ""

        with temporary_file(line) as filename:
            output_file = io.StringIO()
            autoflake._main(
                argv=["my_fake_program", "--in-place", filename],
                standard_out=output_file,
                standard_error=None,
            )
            with open(filename) as f:
                self.assertEqual(line, f.read())

    def test_in_place_with_with_useless_pass(self):
        with temporary_file(
            """\
import foo
x = foo
import subprocess
x()

try:
    pass
    import os
except ImportError:
    pass
    import os
    import sys
""",
        ) as filename:
            output_file = io.StringIO()
            autoflake._main(
                argv=["my_fake_program", "--in-place", filename],
                standard_out=output_file,
                standard_error=None,
            )
            with open(filename) as f:
                self.assertEqual(
                    """\
import foo
x = foo
x()

try:
    pass
except ImportError:
    pass
""",
                    f.read(),
                )

    def test_with_missing_file(self):
        output_file = io.StringIO()
        ignore = StubFile()
        autoflake._main(
            argv=["my_fake_program", "--in-place", ".fake"],
            standard_out=output_file,
            standard_error=ignore,
        )
        self.assertFalse(output_file.getvalue())

    def test_ignore_hidden_directories(self):
        with temporary_directory() as directory:
            with temporary_directory(
                prefix=".",
                directory=directory,
            ) as inner_directory:

                with temporary_file(
                    """\
import re
import os
""",
                    directory=inner_directory,
                ):

                    output_file = io.StringIO()
                    autoflake._main(
                        argv=[
                            "my_fake_program",
                            "--recursive",
                            directory,
                        ],
                        standard_out=output_file,
                        standard_error=None,
                    )
                    self.assertEqual(
                        "",
                        output_file.getvalue().strip(),
                    )

    def test_redundant_options(self):
        output_file = io.StringIO()
        autoflake._main(
            argv=[
                "my_fake_program",
                "--remove-all",
                "--imports=blah",
                __file__,
            ],
            standard_out=output_file,
            standard_error=output_file,
        )

        self.assertIn("redundant", output_file.getvalue())

    def test_in_place_and_stdout(self):
        output_file = io.StringIO()
        self.assertRaises(
            SystemExit,
            autoflake._main,
            argv=["my_fake_program", "--in-place", "--stdout", __file__],
            standard_out=output_file,
            standard_error=output_file,
        )

    def test_end_to_end(self):
        with temporary_file(
            """\
import fake_fake, fake_foo, fake_bar, fake_zoo
import re, os
x = os.sep
print(x)
""",
        ) as filename:
            process = subprocess.Popen(
                AUTOFLAKE_COMMAND
                + [
                    "--imports=fake_foo,fake_bar",
                    filename,
                ],
                stdout=subprocess.PIPE,
            )
            self.assertEqual(
                """\
-import fake_fake, fake_foo, fake_bar, fake_zoo
-import re, os
+import fake_fake
+import fake_zoo
+import os
 x = os.sep
 print(x)
""",
                "\n".join(process.communicate()[0].decode().split(os.linesep)[3:]),
            )

    def test_end_to_end_with_remove_all_unused_imports(self):
        with temporary_file(
            """\
import fake_fake, fake_foo, fake_bar, fake_zoo
import re, os
x = os.sep
print(x)
""",
        ) as filename:
            process = subprocess.Popen(
                AUTOFLAKE_COMMAND
                + [
                    "--remove-all",
                    filename,
                ],
                stdout=subprocess.PIPE,
            )
            self.assertEqual(
                """\
-import fake_fake, fake_foo, fake_bar, fake_zoo
-import re, os
+import os
 x = os.sep
 print(x)
""",
                "\n".join(process.communicate()[0].decode().split(os.linesep)[3:]),
            )

    def test_end_to_end_with_remove_duplicate_keys_multiple_lines(self):
        with temporary_file(
            """\
a = {
    'b': 456,
    'a': 123,
    'b': 7834,
    'a': 'wow',
    'b': 456,
    'c': 'hello',
    'c': 'hello2',
    'b': 'hiya',
}
print(a)
""",
        ) as filename:
            process = subprocess.Popen(
                AUTOFLAKE_COMMAND
                + [
                    "--remove-duplicate-keys",
                    filename,
                ],
                stdout=subprocess.PIPE,
            )
            self.assertEqual(
                """\
 a = {
-    'b': 456,
-    'a': 123,
-    'b': 7834,
     'a': 'wow',
-    'b': 456,
-    'c': 'hello',
     'c': 'hello2',
     'b': 'hiya',
 }
""",
                "\n".join(process.communicate()[0].decode().split(os.linesep)[3:]),
            )

    def test_end_to_end_with_remove_duplicate_keys_and_other_errors(self):
        with temporary_file(
            """\
from math import *
print(sin(4))
a = { # Hello
    'b': 456,
    'a': 123,
    'b': 7834,
    'a': 'wow',
    'b': 456,
    'c': 'hello',
    'c': 'hello2',
    'b': 'hiya',
}
print(a)
""",
        ) as filename:
            process = subprocess.Popen(
                AUTOFLAKE_COMMAND
                + [
                    "--remove-duplicate-keys",
                    filename,
                ],
                stdout=subprocess.PIPE,
            )
            self.assertEqual(
                """\
 from math import *
 print(sin(4))
 a = { # Hello
-    'b': 456,
-    'a': 123,
-    'b': 7834,
     'a': 'wow',
-    'b': 456,
-    'c': 'hello',
     'c': 'hello2',
     'b': 'hiya',
 }
""",
                "\n".join(process.communicate()[0].decode().split(os.linesep)[3:]),
            )

    def test_end_to_end_with_remove_duplicate_keys_tuple(self):
        with temporary_file(
            """\
a = {
  (0,1): 1,
  (0, 1): 'two',
  (0,1): 3,
}
print(a)
""",
        ) as filename:
            process = subprocess.Popen(
                AUTOFLAKE_COMMAND
                + [
                    "--remove-duplicate-keys",
                    filename,
                ],
                stdout=subprocess.PIPE,
            )
            self.assertEqual(
                """\
 a = {
-  (0,1): 1,
-  (0, 1): 'two',
   (0,1): 3,
 }
 print(a)
""",
                "\n".join(process.communicate()[0].decode().split(os.linesep)[3:]),
            )

    def test_end_to_end_with_error(self):
        with temporary_file(
            """\
import fake_fake, fake_foo, fake_bar, fake_zoo
import re, os
x = os.sep
print(x)
""",
        ) as filename:
            process = subprocess.Popen(
                AUTOFLAKE_COMMAND
                + [
                    "--imports=fake_foo,fake_bar",
                    "--remove-all",
                    filename,
                ],
                stderr=subprocess.PIPE,
            )
            self.assertIn(
                "redundant",
                process.communicate()[1].decode(),
            )

    def test_end_to_end_from_stdin(self):
        stdin_data = b"""\
import fake_fake, fake_foo, fake_bar, fake_zoo
import re, os
x = os.sep
print(x)
"""
        process = subprocess.Popen(
            AUTOFLAKE_COMMAND + ["--remove-all", "-"],
            stdout=subprocess.PIPE,
            stdin=subprocess.PIPE,
        )
        stdout, _ = process.communicate(stdin_data)
        self.assertEqual(
            """\
import os
x = os.sep
print(x)
""",
            "\n".join(stdout.decode().split(os.linesep)),
        )

    def test_end_to_end_from_stdin_with_in_place(self):
        stdin_data = b"""\
import fake_fake, fake_foo, fake_bar, fake_zoo
import re, os, sys
x = os.sep
print(x)
"""
        process = subprocess.Popen(
            AUTOFLAKE_COMMAND + ["--remove-all", "--in-place", "-"],
            stdout=subprocess.PIPE,
            stdin=subprocess.PIPE,
        )
        stdout, _ = process.communicate(stdin_data)
        self.assertEqual(
            """\
import os
x = os.sep
print(x)
""",
            "\n".join(stdout.decode().split(os.linesep)),
        )


class MultilineFromImportTests(unittest.TestCase):
    def test_is_over(self):
        filt = autoflake.FilterMultilineImport("from . import (\n")
        self.assertTrue(filt.is_over("module)\n"))
        self.assertTrue(filt.is_over("  )\n"))
        self.assertTrue(filt.is_over("  )  # comment\n"))
        self.assertTrue(filt.is_over("from module import (a, b)\n"))
        self.assertFalse(filt.is_over("#  )"))
        self.assertFalse(filt.is_over("module\n"))
        self.assertFalse(filt.is_over("module, \\\n"))
        self.assertFalse(filt.is_over("\n"))

        filt = autoflake.FilterMultilineImport("from . import module, \\\n")
        self.assertTrue(filt.is_over("module\n"))
        self.assertTrue(filt.is_over("\n"))
        self.assertTrue(filt.is_over("m1, m2  # comment with \\\n"))
        self.assertFalse(filt.is_over("m1, m2 \\\n"))
        self.assertFalse(filt.is_over("m1, m2 \\  #\n"))
        self.assertFalse(filt.is_over("m1, m2 \\  # comment with \\\n"))
        self.assertFalse(filt.is_over("\\\n"))

        # "Multiline" imports that are not really multiline
        filt = autoflake.FilterMultilineImport(
            "import os; " "import math, subprocess",
        )
        self.assertTrue(filt.is_over())

    unused = ()

    def assert_fix(self, lines, result, remove_all=True):
        fixer = autoflake.FilterMultilineImport(
            lines[0],
            remove_all_unused_imports=remove_all,
            unused_module=self.unused,
        )
        fixed = functools.reduce(lambda acc, x: acc(x), lines[1:], fixer())
        self.assertEqual(fixed, result)

    def test_fix(self):
        self.unused = ["third_party.lib" + str(x) for x in (1, 3, 4)]

        # Example m0 (isort)
        self.assert_fix(
            [
                "from third_party import (lib1, lib2, lib3,\n",
                "                         lib4, lib5, lib6)\n",
            ],
            "from third_party import (lib2, lib5, lib6)\n",
        )

        # Example m1(isort)
        self.assert_fix(
            [
                "from third_party import (lib1,\n",
                "                         lib2,\n",
                "                         lib3,\n",
                "                         lib4,\n",
                "                         lib5,\n",
                "                         lib6)\n",
            ],
            "from third_party import (lib2,\n"
            "                         lib5,\n"
            "                         lib6)\n",
        )

        # Variation m1(isort)
        self.assert_fix(
            [
                "from third_party import (lib1\n",
                "                        ,lib2\n",
                "                        ,lib3\n",
                "                        ,lib4\n",
                "                        ,lib5\n",
                "                        ,lib6)\n",
            ],
            "from third_party import (lib2\n"
            "                        ,lib5\n"
            "                        ,lib6)\n",
        )

        # Example m2 (isort)
        self.assert_fix(
            [
                "from third_party import \\\n",
                "    lib1, lib2, lib3, \\\n",
                "    lib4, lib5, lib6\n",
            ],
            "from third_party import \\\n" "    lib2, lib5, lib6\n",
        )

        # Example m3 (isort)
        self.assert_fix(
            [
                "from third_party import (\n",
                "    lib1,\n",
                "    lib2,\n",
                "    lib3,\n",
                "    lib4,\n",
                "    lib5\n",
                ")\n",
            ],
            "from third_party import (\n" "    lib2,\n" "    lib5\n" ")\n",
        )

        # Example m4 (isort)
        self.assert_fix(
            [
                "from third_party import (\n",
                "    lib1, lib2, lib3, lib4,\n",
                "    lib5, lib6)\n",
            ],
            "from third_party import (\n" "    lib2, lib5, lib6)\n",
        )

        # Example m5 (isort)
        self.assert_fix(
            [
                "from third_party import (\n",
                "    lib1, lib2, lib3, lib4,\n",
                "    lib5, lib6\n",
                ")\n",
            ],
            "from third_party import (\n" "    lib2, lib5, lib6\n" ")\n",
        )

        # Some Deviations
        self.assert_fix(
            [
                "from third_party import (\n",
                "    lib1\\\n",  # only unused + line continuation
                "    ,lib2, \n",
                "    libA\n",  # used import with no commas
                "    ,lib3, \n",  # leading and trailing commas + unused import
                "    libB, \n",
                "    \\\n",  # empty line with continuation
                "    lib4,\n",  # unused import with comment
                ")\n",
            ],
            "from third_party import (\n"
            "    lib2\\\n"
            "    ,libA, \n"
            "    libB,\n"
            ")\n",
        )

        self.assert_fix(
            [
                "from third_party import (\n",
                "    lib1\n",
                ",\n",
                "    lib2\n",
                ",\n",
                "    lib3\n",
                ",\n",
                "    lib4\n",
                ",\n",
                "    lib5\n",
                ")\n",
            ],
            "from third_party import (\n" "    lib2\n" ",\n" "    lib5\n" ")\n",
        )

        self.assert_fix(
            [
                "from third_party import (\n",
                "    lib1 \\\n",
                ", \\\n",
                "    lib2 \\\n",
                ",\\\n",
                "    lib3\n",
                ",\n",
                "    lib4\n",
                ",\n",
                "    lib5 \\\n",
                ")\n",
            ],
            "from third_party import (\n"
            "    lib2 \\\n"
            ", \\\n"
            "    lib5 \\\n"
            ")\n",
        )

    def test_indentation(self):
        # Some weird indentation examples
        self.unused = ["third_party.lib" + str(x) for x in (1, 3, 4)]
        self.assert_fix(
            [
                "    from third_party import (\n",
                "            lib1, lib2, lib3, lib4,\n",
                "    lib5, lib6\n",
                ")\n",
            ],
            "    from third_party import (\n" "            lib2, lib5, lib6\n" ")\n",
        )
        self.assert_fix(
            [
                "\tfrom third_party import \\\n",
                "\t\tlib1, lib2, lib3, \\\n",
                "\t\tlib4, lib5, lib6\n",
            ],
            "\tfrom third_party import \\\n" "\t\tlib2, lib5, lib6\n",
        )

    def test_fix_relative(self):
        # Example m0 (isort)
        self.unused = [".lib" + str(x) for x in (1, 3, 4)]
        self.assert_fix(
            [
                "from . import (lib1, lib2, lib3,\n",
                "               lib4, lib5, lib6)\n",
            ],
            "from . import (lib2, lib5, lib6)\n",
        )

        # Example m1(isort)
        self.unused = ["..lib" + str(x) for x in (1, 3, 4)]
        self.assert_fix(
            [
                "from .. import (lib1,\n",
                "                lib2,\n",
                "                lib3,\n",
                "                lib4,\n",
                "                lib5,\n",
                "                lib6)\n",
            ],
            "from .. import (lib2,\n"
            "                lib5,\n"
            "                lib6)\n",
        )

        # Example m2 (isort)
        self.unused = ["...lib" + str(x) for x in (1, 3, 4)]
        self.assert_fix(
            [
                "from ... import \\\n",
                "    lib1, lib2, lib3, \\\n",
                "    lib4, lib5, lib6\n",
            ],
            "from ... import \\\n" "    lib2, lib5, lib6\n",
        )

        # Example m3 (isort)
        self.unused = [".parent.lib" + str(x) for x in (1, 3, 4)]
        self.assert_fix(
            [
                "from .parent import (\n",
                "    lib1,\n",
                "    lib2,\n",
                "    lib3,\n",
                "    lib4,\n",
                "    lib5\n",
                ")\n",
            ],
            "from .parent import (\n" "    lib2,\n" "    lib5\n" ")\n",
        )

    def test_fix_without_from(self):
        self.unused = ["lib" + str(x) for x in (1, 3, 4)]

        # Multiline but not "from"
        self.assert_fix(
            [
                "import \\\n",
                "    lib1, lib2, lib3 \\\n",
                "    ,lib4, lib5, lib6\n",
            ],
            "import \\\n" "    lib2, lib5, lib6\n",
        )
        self.assert_fix(
            [
                "import lib1, lib2, lib3, \\\n",
                "       lib4, lib5, lib6\n",
            ],
            "import lib2, lib5, lib6\n",
        )

        # Problematic example without "from"
        self.assert_fix(
            [
                "import \\\n",
                "    lib1,\\\n",
                "    lib2, \\\n",
                "    libA\\\n",  # used import with no commas
                "    ,lib3, \\\n",  # leading and trailing commas with unused
                "    libB, \\\n",
                "    \\  \n",  # empty line with continuation
                "    lib4\\\n",  # unused import with comment
                "\n",
            ],
            "import \\\n" "    lib2,\\\n" "    libA, \\\n" "    libB\\\n" "\n",
        )

        self.unused = [f"lib{x}.x.y.z" for x in (1, 3, 4)]
        self.assert_fix(
            [
                "import \\\n",
                "    lib1.x.y.z \\",
                "    , \\\n",
                "    lib2.x.y.z \\\n",
                "    , \\\n",
                "    lib3.x.y.z \\\n",
                "    , \\\n",
                "    lib4.x.y.z \\\n",
                "    , \\\n",
                "    lib5.x.y.z\n",
            ],
            "import \\\n" "    lib2.x.y.z \\" "    , \\\n" "    lib5.x.y.z\n",
        )

    def test_give_up(self):
        # Semicolon
        self.unused = ["lib" + str(x) for x in (1, 3, 4)]
        self.assert_fix(
            [
                "import \\\n",
                "    lib1, lib2, lib3, \\\n",
                "    lib4, lib5; import lib6\n",
            ],
            "import \\\n" "    lib1, lib2, lib3, \\\n" "    lib4, lib5; import lib6\n",
        )
        # Comments
        self.unused = [".lib" + str(x) for x in (1, 3, 4)]
        self.assert_fix(
            [
                "from . import ( # comment\n",
                "    lib1,\\\n",  # only unused + line continuation
                "    lib2, \n",
                "    libA\n",  # used import with no commas
                "    ,lib3, \n",  # leading and trailing commas + unused import
                "    libB, \n",
                "    \\  \n",  # empty line with continuation
                "    lib4,  # noqa \n",  # unused import with comment
                ") ; import sys\n",
            ],
            "from . import ( # comment\n"
            "    lib1,\\\n"
            "    lib2, \n"
            "    libA\n"
            "    ,lib3, \n"
            "    libB, \n"
            "    \\  \n"
            "    lib4,  # noqa \n"
            ") ; import sys\n",
        )

    def test_just_one_import_used(self):
        self.unused = ["lib2"]
        self.assert_fix(
            [
                "import \\\n",
                "    lib1\n",
            ],
            "import \\\n" "    lib1\n",
        )
        self.assert_fix(
            [
                "import \\\n",
                "    lib2\n",
            ],
            "pass\n",
        )
        # Example from issue #8
        self.unused = ["re.subn"]
        self.assert_fix(
            [
                "\tfrom re import (subn)\n",
            ],
            "\tpass\n",
        )

    def test_just_one_import_left(self):
        # Examples from issue #8
        self.unused = ["math.sqrt"]
        self.assert_fix(
            [
                "from math import (\n",
                "        sqrt,\n",
                "        log\n",
                "    )\n",
            ],
            "from math import (\n" "        log\n" "    )\n",
        )
        self.unused = ["module.b"]
        self.assert_fix(
            [
                "from module import (a, b)\n",
            ],
            "from module import a\n",
        )
        self.assert_fix(
            [
                "from module import (a,\n",
                "                    b)\n",
            ],
            "from module import a\n",
        )
        self.unused = []
        self.assert_fix(
            [
                "from re import (subn)\n",
            ],
            "from re import (subn)\n",
        )

    def test_no_empty_imports(self):
        self.unused = ["lib" + str(x) for x in (1, 3, 4)]
        self.assert_fix(
            [
                "import \\\n",
                "    lib1, lib3, \\\n",
                "    lib4 \n",
            ],
            "pass \n",
        )

        # Indented parenthesized block
        self.unused = [".parent.lib" + str(x) for x in (1, 3, 4)]
        self.assert_fix(
            [
                "\t\tfrom .parent import (\n",
                "    lib1,\n",
                "    lib3,\n",
                "    lib4,\n",
                ")\n",
            ],
            "\t\tpass\n",
        )

    def test_without_remove_all(self):
        self.unused = ["lib" + str(x) for x in (1, 3, 4)]
        self.assert_fix(
            [
                "import \\\n",
                "    lib1,\\\n",
                "    lib3,\\\n",
                "    lib4\n",
            ],
            "import \\\n" "    lib1,\\\n" "    lib3,\\\n" "    lib4\n",
            remove_all=False,
        )

        self.unused += ["os.path." + x for x in ("dirname", "isdir", "join")]
        self.assert_fix(
            [
                "from os.path import (\n",
                "    dirname,\n",
                "    isdir,\n",
                "    join,\n",
                ")\n",
            ],
            "pass\n",
            remove_all=False,
        )
        self.assert_fix(
            [
                "import \\\n",
                "    os.path.dirname, \\\n",
                "    lib1, \\\n",
                "    lib3\n",
            ],
            "import \\\n" "    lib1, \\\n" "    lib3\n",
            remove_all=False,
        )


class ConfigFileTest(unittest.TestCase):
    def setUp(self):
        self.tmpdir = tempfile.mkdtemp(prefix="autoflake.")

    def tearDown(self):
        shutil.rmtree(self.tmpdir)
        self.tmpdir = None

    def effective_path(self, path, is_file=True):
        path = os.path.normpath(path)
        if os.path.isabs(path):
            raise ValueError("Should not create an absolute test path")
        effective_path = os.path.sep.join([self.tmpdir, path])
        if not effective_path.startswith(
            f"{self.tmpdir}{os.path.sep}",
        ) and (effective_path != self.tmpdir or is_file):
            raise ValueError("Should create a path within the tmp dir only")
        return effective_path

    def create_dir(self, path):
        effective_path = self.effective_path(path, False)
        if sys.version_info >= (3, 2, 0):
            os.makedirs(effective_path, exist_ok=True)
        else:
            if os.path.exists(effective_path):
                return
            try:
                os.mkdir(effective_path)
            except OSError:
                parent = os.path.split(path)[0]
                if not parent:
                    raise
                self.create_dir(parent)
                os.mkdir(effective_path)

    def create_file(self, path, contents=""):
        effective_path = self.effective_path(path)
        self.create_dir(os.path.split(path)[0])
        with open(effective_path, "wt") as f:
            f.write(contents)

    def assert_namespace(self, namespace, expected_props):
        keys = (prop for prop in dir(namespace) if not prop.startswith("_"))
        actual_props = {key: getattr(namespace, key) for key in keys}
        assert actual_props == expected_props

    def test_no_config_file(self):
        self.create_file("test_me.py")
        original_args = {"files": [self.effective_path("test_me.py")]}
        args = Namespace(**original_args)
        assert autoflake.merge_configuration_file(args)
        self.assert_namespace(args, original_args)

    def test_non_nested_pyproject_toml_empty(self):
        self.create_file("test_me.py")
        self.create_file("pyproject.toml", '[tool.other]\nprop="value"\n')
        files = [self.effective_path("test_me.py")]
        args = Namespace(files=files)
        assert autoflake.merge_configuration_file(args)
        self.assert_namespace(args, {"files": files})

    def test_non_nested_pyproject_toml_non_empty(self):
        self.create_file("test_me.py")
        self.create_file(
            "pyproject.toml",
            "[tool.autoflake]\nexpand-star-imports=true\n",
        )
        files = [self.effective_path("test_me.py")]
        args = Namespace(files=files)
        assert autoflake.merge_configuration_file(args)
        self.assert_namespace(
            args,
            {"files": files, "expand_star_imports": True},
        )

    def test_non_nested_setup_cfg_non_empty(self):
        self.create_file("test_me.py")
        self.create_file(
            "setup.cfg",
            "[other]\nexpand-star-imports = yes\n",
        )
        files = [self.effective_path("test_me.py")]
        args = Namespace(files=files)
        assert autoflake.merge_configuration_file(args)
        self.assert_namespace(
            args,
            {"files": files},
        )

    def test_non_nested_setup_cfg_empty(self):
        self.create_file("test_me.py")
        self.create_file(
            "setup.cfg",
            "[autoflake]\nexpand-star-imports = yes\n",
        )
        files = [self.effective_path("test_me.py")]
        args = Namespace(files=files)
        assert autoflake.merge_configuration_file(args)
        self.assert_namespace(
            args,
            {"files": files, "expand_star_imports": True},
        )

    def test_nested_file(self):
        self.create_file("nested/file/test_me.py")
        self.create_file(
            "pyproject.toml",
            "[tool.autoflake]\nexpand-star-imports=true\n",
        )
        files = [self.effective_path("nested/file/test_me.py")]
        args = Namespace(files=files)
        assert autoflake.merge_configuration_file(args)
        self.assert_namespace(
            args,
            {"files": files, "expand_star_imports": True},
        )

    def test_common_path_nested_file_do_not_load(self):
        self.create_file("nested/file/test_me.py")
        self.create_file("nested/other/test_me.py")
        self.create_file(
            "nested/file/pyproject.toml",
            "[tool.autoflake]\nexpand-star-imports=true\n",
        )
        files = [
            self.effective_path("nested/file/test_me.py"),
            self.effective_path("nested/other/test_me.py"),
        ]
        args = Namespace(files=files)
        assert autoflake.merge_configuration_file(args)
        self.assert_namespace(
            args,
            {"files": files},
        )

    def test_common_path_nested_file_do_load(self):
        self.create_file("nested/file/test_me.py")
        self.create_file("nested/other/test_me.py")
        self.create_file(
            "nested/pyproject.toml",
            "[tool.autoflake]\nexpand-star-imports=true\n",
        )
        files = [
            self.effective_path("nested/file/test_me.py"),
            self.effective_path("nested/other/test_me.py"),
        ]
        args = Namespace(files=files)
        assert autoflake.merge_configuration_file(args)
        self.assert_namespace(
            args,
            {"files": files, "expand_star_imports": True},
        )

    def test_common_path_instead_of_common_prefix(self):
        """Using common prefix would result in a failure."""
        self.create_file("nested/file-foo/test_me.py")
        self.create_file("nested/file-bar/test_me.py")
        self.create_file(
            "nested/file/pyproject.toml",
            "[tool.autoflake]\nexpand-star-imports=true\n",
        )
        files = [
            self.effective_path("nested/file-foo/test_me.py"),
            self.effective_path("nested/file-bar/test_me.py"),
        ]
        args = Namespace(files=files)
        assert autoflake.merge_configuration_file(args)
        self.assert_namespace(
            args,
            {"files": files},
        )

    def test_continue_search_if_no_config_found(self):
        self.create_file("nested/test_me.py")
        self.create_file(
            "nested/pyproject.toml",
            '[tool.other]\nprop = "value"\n',
        )
        self.create_file(
            "pyproject.toml",
            "[tool.autoflake]\nexpand-star-imports = true\n",
        )
        files = [self.effective_path("nested/test_me.py")]
        args = Namespace(files=files)
        assert autoflake.merge_configuration_file(args)
        self.assert_namespace(
            args,
            {"files": files, "expand_star_imports": True},
        )

    def test_stop_search_if_config_found(self):
        self.create_file("nested/test_me.py")
        self.create_file(
            "nested/pyproject.toml",
            "[tool.autoflake]\n",
        )
        self.create_file(
            "pyproject.toml",
            "[tool.autoflake]\nexpand-star-imports = true\n",
        )
        files = [self.effective_path("nested/test_me.py")]
        args = Namespace(files=files)
        assert autoflake.merge_configuration_file(args)
        self.assert_namespace(
            args,
            {"files": files},
        )

    def test_dont_load_false(self):
        self.create_file("test_me.py")
        self.create_file(
            "setup.cfg",
            "[autoflake]\nexpand-star-imports = no\n",
        )
        files = [self.effective_path("test_me.py")]
        args = Namespace(files=files)
        assert autoflake.merge_configuration_file(args)
        self.assert_namespace(
            args,
            {"files": files},
        )

    def test_list_value_pyproject_toml(self):
        self.create_file("test_me.py")
        self.create_file(
            "pyproject.toml",
            '[tool.autoflake]\nimports=["my_lib", "other_lib"]\n',
        )
        files = [self.effective_path("test_me.py")]
        args = Namespace(files=files)
        assert autoflake.merge_configuration_file(args)
        self.assert_namespace(
            args,
            {"files": files, "imports": "my_lib,other_lib"},
        )

    def test_list_value_comma_sep_string_pyproject_toml(self):
        self.create_file("test_me.py")
        self.create_file(
            "pyproject.toml",
            '[tool.autoflake]\nimports="my_lib,other_lib"\n',
        )
        files = [self.effective_path("test_me.py")]
        args = Namespace(files=files)
        assert autoflake.merge_configuration_file(args)
        self.assert_namespace(
            args,
            {"files": files, "imports": "my_lib,other_lib"},
        )

    def test_list_value_setup_cfg(self):
        self.create_file("test_me.py")
        self.create_file(
            "setup.cfg",
            "[autoflake]\nimports=my_lib,other_lib\n",
        )
        files = [self.effective_path("test_me.py")]
        args = Namespace(files=files)
        assert autoflake.merge_configuration_file(args)
        self.assert_namespace(
            args,
            {"files": files, "imports": "my_lib,other_lib"},
        )

    def test_unknown_property(self):
        self.create_file("test_me.py")
        self.create_file(
            "pyproject.toml",
            "[tool.autoflake]\nunknown_prop=true\n",
        )
        files = [self.effective_path("test_me.py")]
        args = Namespace(files=files)
        assert not autoflake.merge_configuration_file(args)

    def test_non_bool_value_for_bool_property(self):
        self.create_file("test_me.py")
        self.create_file(
            "pyproject.toml",
            '[tool.autoflake]\nexpand-star-imports="invalid"\n',
        )
        files = [self.effective_path("test_me.py")]
        args = Namespace(files=files)
        assert not autoflake.merge_configuration_file(args)

    def test_non_bool_value_for_bool_property_in_setup_cfg(self):
        self.create_file("test_me.py")
        self.create_file(
            "setup.cfg",
            "[autoflake]\nexpand-star-imports=ok\n",
        )
        files = [self.effective_path("test_me.py")]
        args = Namespace(files=files)
        assert not autoflake.merge_configuration_file(args)

    def test_non_list_value_for_list_property(self):
        self.create_file("test_me.py")
        self.create_file(
            "pyproject.toml",
            "[tool.autoflake]\nexclude=true\n",
        )
        files = [self.effective_path("test_me.py")]
        args = Namespace(files=files)
        assert not autoflake.merge_configuration_file(args)

    def test_merge_with_cli_set_list_property(self):
        self.create_file("test_me.py")
        self.create_file(
            "pyproject.toml",
            '[tool.autoflake]\nimports=["my_lib"]\n',
        )
        files = [self.effective_path("test_me.py")]
        args = Namespace(files=files, imports="other_lib")
        assert autoflake.merge_configuration_file(args)
        self.assert_namespace(
            args,
            {"files": files, "imports": "my_lib,other_lib"},
        )


@contextlib.contextmanager
def temporary_file(contents, directory=".", suffix=".py", prefix=""):
    """Write contents to temporary file and yield it."""
    f = tempfile.NamedTemporaryFile(
        suffix=suffix,
        prefix=prefix,
        delete=False,
        dir=directory,
    )
    try:
        f.write(contents.encode())
        f.close()
        yield f.name
    finally:
        os.remove(f.name)


@contextlib.contextmanager
def temporary_directory(directory=".", prefix="tmp."):
    """Create temporary directory and yield its path."""
    temp_directory = tempfile.mkdtemp(prefix=prefix, dir=directory)
    try:
        yield temp_directory
    finally:
        shutil.rmtree(temp_directory)


class StubFile:

    """Fake file that ignores everything."""

    def write(*_):
        """Ignore."""


if __name__ == "__main__":
    unittest.main()