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TST: Add test for set_index not mutating index when parent is mutated #51324

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Feb 14, 2023
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TST: Add test for set_index not mutating index when parent is mutated #51324

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9 changes: 9 additions & 0 deletions pandas/tests/copy_view/test_methods.py
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Original file line number Diff line number Diff line change
Expand Up @@ -648,6 +648,15 @@ def test_set_index(using_copy_on_write):
tm.assert_frame_equal(df, df_orig)


def test_set_index_mutating_parent_does_not_mutate_index():
df = DataFrame({"a": [1, 2, 3], "b": 1})
result = df.set_index("a")
expected = result.copy()

df.iloc[0, 0] = 100
tm.assert_frame_equal(result, expected)


def test_add_prefix(using_copy_on_write):
# GH 49473
df = DataFrame({"a": [1, 2, 3], "b": [4, 5, 6], "c": [0.1, 0.2, 0.3]})
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