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zipper_test.py
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zipper_test.py
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# These tests are auto-generated with test data from:
# https://github.com/exercism/problem-specifications/tree/main/exercises/zipper/canonical-data.json
# File last updated on 2023-07-19
import unittest
from zipper import (
Zipper,
)
class ZipperTest(unittest.TestCase):
def test_data_is_retained(self):
initial = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
expected = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
zipper = Zipper.from_tree(initial)
result = zipper.to_tree()
self.assertEqual(result, expected)
def test_left_right_and_value(self):
initial = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
zipper = Zipper.from_tree(initial)
result = zipper.left().right().value()
self.assertEqual(result, 3)
def test_dead_end(self):
initial = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
zipper = Zipper.from_tree(initial)
result = zipper.left().left()
self.assertIsNone(result)
def test_tree_from_deep_focus(self):
initial = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
expected = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
zipper = Zipper.from_tree(initial)
result = zipper.left().right().to_tree()
self.assertEqual(result, expected)
def test_traversing_up_from_top(self):
initial = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
zipper = Zipper.from_tree(initial)
result = zipper.up()
self.assertIsNone(result)
def test_left_right_and_up(self):
initial = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
zipper = Zipper.from_tree(initial)
result = zipper.left().up().right().up().left().right().value()
self.assertEqual(result, 3)
def test_test_ability_to_descend_multiple_levels_and_return(self):
initial = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
zipper = Zipper.from_tree(initial)
result = zipper.left().right().up().up().value()
self.assertEqual(result, 1)
def test_set_value(self):
initial = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
expected = {
"value": 1,
"left": {
"value": 5,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
zipper = Zipper.from_tree(initial)
result = zipper.left().set_value(5).to_tree()
self.assertEqual(result, expected)
def test_set_value_after_traversing_up(self):
initial = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
expected = {
"value": 1,
"left": {
"value": 5,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
zipper = Zipper.from_tree(initial)
result = zipper.left().right().up().set_value(5).to_tree()
self.assertEqual(result, expected)
def test_set_left_with_leaf(self):
initial = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
expected = {
"value": 1,
"left": {
"value": 2,
"left": {"value": 5, "left": None, "right": None},
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
zipper = Zipper.from_tree(initial)
result = (
zipper.left().set_left({"value": 5, "left": None, "right": None}).to_tree()
)
self.assertEqual(result, expected)
def test_set_right_with_null(self):
initial = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
expected = {
"value": 1,
"left": {"value": 2, "left": None, "right": None},
"right": {"value": 4, "left": None, "right": None},
}
zipper = Zipper.from_tree(initial)
result = zipper.left().set_right(None).to_tree()
self.assertEqual(result, expected)
def test_set_right_with_subtree(self):
initial = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
expected = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {
"value": 6,
"left": {"value": 7, "left": None, "right": None},
"right": {"value": 8, "left": None, "right": None},
},
}
zipper = Zipper.from_tree(initial)
result = zipper.set_right(
{
"value": 6,
"left": {"value": 7, "left": None, "right": None},
"right": {"value": 8, "left": None, "right": None},
}
).to_tree()
self.assertEqual(result, expected)
def test_set_value_on_deep_focus(self):
initial = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
expected = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 5, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
zipper = Zipper.from_tree(initial)
result = zipper.left().right().set_value(5).to_tree()
self.assertEqual(result, expected)
def test_different_paths_to_same_zipper(self):
initial = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
result = Zipper.from_tree(initial).left().up().right().to_tree()
final = {
"value": 1,
"left": {
"value": 2,
"left": None,
"right": {"value": 3, "left": None, "right": None},
},
"right": {"value": 4, "left": None, "right": None},
}
expected = Zipper.from_tree(final).right().to_tree()
self.assertEqual(result, expected)