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TST: Add test for missing fillvalue in categorical dtype #37720

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Nov 9, 2020
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TST: Add test for missing fillvalue in categorical dtype #37720

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10 changes: 9 additions & 1 deletion pandas/tests/indexes/categorical/test_reindex.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
import numpy as np
import pytest

from pandas import Categorical, CategoricalIndex, Index
from pandas import Categorical, CategoricalIndex, Index, Series
import pandas._testing as tm


Expand Down Expand Up @@ -51,3 +52,10 @@ def test_reindex_empty_index(self):
res, indexer = c.reindex(["a", "b"])
tm.assert_index_equal(res, Index(["a", "b"]), exact=True)
tm.assert_numpy_array_equal(indexer, np.array([-1, -1], dtype=np.intp))

def test_reindex_missing_category(self):
# GH: 18185
ser = Series([1, 2, 3, 1], dtype="category")
msg = "'fill_value=-1' is not present in this Categorical's categories"
with pytest.raises(ValueError, match=msg):
ser.reindex([1, 2, 3, 4, 5], fill_value=-1)