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TST: Add test_factorize_mixed_values #50784

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Jan 17, 2023
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TST: Add test_factorize_mixed_values #50784

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26 changes: 26 additions & 0 deletions pandas/tests/test_algos.py
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Original file line number Diff line number Diff line change
Expand Up @@ -505,6 +505,32 @@ def test_int_factorize_use_na_sentinel_false(
tm.assert_numpy_array_equal(uniques, expected_uniques, strict_nan=True)
tm.assert_numpy_array_equal(codes, expected_codes, strict_nan=True)

@pytest.mark.parametrize(
"data, expected_codes, expected_uniques",
[
(
Index(Categorical(["a", "a", "b"])),
np.array([0, 0, 1], dtype=np.intp),
CategoricalIndex(["a", "b"], categories=["a", "b"], dtype="category"),
),
(
Series(Categorical(["a", "a", "b"])),
np.array([0, 0, 1], dtype=np.intp),
CategoricalIndex(["a", "b"], categories=["a", "b"], dtype="category"),
),
(
Series(DatetimeIndex(["2017", "2017"], tz="US/Eastern")),
np.array([0, 0], dtype=np.intp),
DatetimeIndex(["2017"], tz="US/Eastern"),
),
],
)
def test_factorize_mixed_values(self, data, expected_codes, expected_uniques):
# GH 19721
codes, uniques = algos.factorize(data)
tm.assert_numpy_array_equal(codes, expected_codes)
tm.assert_index_equal(uniques, expected_uniques)


class TestUnique:
def test_ints(self):
Expand Down