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gh-128377: Fix test_cmd_line.test_non_interactive_output_buffering fail with PYTHONUNBUFFERED=1 #128378

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gh-128377: Fix test_cmd_line.test_non_interactive_output_buffering fail with PYTHONUNBUFFERED=1 #128378

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565f15c
Fix `test_cmd_line.test_non_interactive_output_buffering` fail with `…
WolframAlph Dec 31, 2024
7ff7de3
Use get if `PYTHONUNBUFFERED` is not defined`
WolframAlph Dec 31, 2024
a42798d
Use `EnvironmentVarGuard` to set `PYTHONUNBUFFERED`
WolframAlph Jan 1, 2025
6bc56b8
use unittest.skipIf
WolframAlph Jan 2, 2025
c13851c
fix spaces
WolframAlph Jan 2, 2025
db3031a
add line break
WolframAlph Jan 2, 2025
9aa5866
fix lint
WolframAlph Jan 2, 2025
cf6f0fc
fix alignment
WolframAlph Jan 11, 2025
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29 changes: 16 additions & 13 deletions Lib/test/test_cmd_line.py
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Original file line number Diff line number Diff line change
Expand Up @@ -337,19 +337,22 @@ def test_osx_android_utf8(self):
self.assertEqual(p.returncode, 0)

def test_non_interactive_output_buffering(self):
code = textwrap.dedent("""
import sys
out = sys.stdout
print(out.isatty(), out.write_through, out.line_buffering)
err = sys.stderr
print(err.isatty(), err.write_through, err.line_buffering)
""")
args = [sys.executable, '-c', code]
proc = subprocess.run(args, stdout=subprocess.PIPE,
stderr=subprocess.PIPE, text=True, check=True)
self.assertEqual(proc.stdout,
'False False False\n'
'False False True\n')
with os_helper.EnvironmentVarGuard() as environ:
# we expect buffered stdio
environ["PYTHONUNBUFFERED"] = "0"
code = textwrap.dedent("""
import sys
out = sys.stdout
print(out.isatty(), out.write_through, out.line_buffering)
err = sys.stderr
print(err.isatty(), err.write_through, err.line_buffering)
""")
args = [sys.executable, '-c', code]
proc = subprocess.run(args, stdout=subprocess.PIPE,
stderr=subprocess.PIPE, text=True, check=True)
self.assertEqual(proc.stdout,
'False False False\n'
'False False True\n')

def test_unbuffered_output(self):
# Test expected operation of the '-u' switch
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