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TST: add test for pd.melt category preservation #29510

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Nov 9, 2019
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TST: add test for pd.melt category preservation #29510

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10 changes: 10 additions & 0 deletions pandas/tests/reshape/test_melt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -270,6 +270,16 @@ def test_pandas_dtypes(self, col):
expected.columns = ["klass", "col", "attribute", "value"]
tm.assert_frame_equal(result, expected)

def test_preserve_category(self):
# GH 15853
data = DataFrame({"A": [1, 2], "B": pd.Categorical(["X", "Y"])})
result = pd.melt(data, ["B"], ["A"])
expected = DataFrame(
{"B": pd.Categorical(["X", "Y"]), "variable": ["A", "A"], "value": [1, 2]}
)

tm.assert_frame_equal(result, expected)

def test_melt_missing_columns_raises(self):
# GH-23575
# This test is to ensure that pandas raises an error if melting is
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