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TST: Added test for upcasting to object when concatinating on categorical indexes with non-identical categories #42278

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Merged
merged 10 commits into from
Jul 1, 2021
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TST: Added test for upcasting to object when concatinating on categorical indexes with non-identical categories #42278

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cd35777
Merge pull request #1 from pandas-dev/master
Jul 27, 2017
7ef9e30
Merge remote-tracking branch 'upstream/master'
Apr 18, 2019
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Merge remote-tracking branch 'upstream/master'
Apr 23, 2019
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Merge remote-tracking branch 'upstream/master'
Apr 23, 2019
fba7775
Merge branch 'master' of github.com:P-Tillmann/pandas
Oct 23, 2020
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Merge remote-tracking branch 'upstream/master'
Oct 23, 2020
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Merge remote-tracking branch 'upstream/master'
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Merge branch 'pandas-dev:master' into master
Jun 28, 2021
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test upcasting to object when concatinating on categorical indexes wi…
Jun 28, 2021
ed47241
fixed flake8 issue
Jun 28, 2021
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21 changes: 21 additions & 0 deletions pandas/tests/reshape/concat/test_categorical.py
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Original file line number Diff line number Diff line change
Expand Up @@ -202,3 +202,24 @@ def test_categorical_concat_gh7864(self):

dfa = df1.append(df2)
tm.assert_index_equal(df["grade"].cat.categories, dfa["grade"].cat.categories)

def test_categorical_index_upcast(self):
# GH 17629
# test upcasting to object when concatinating on categorical indexes
# with non-identical categories

a = DataFrame({"foo": [1, 2]}, index=Categorical(["foo", "bar"]))
b = DataFrame({"foo": [4, 3]}, index=Categorical(["baz", "bar"]))

res = pd.concat([a, b])
exp = DataFrame({"foo": [1, 2, 4, 3]}, index=["foo", "bar", "baz", "bar"])

tm.assert_equal(res, exp)

a = Series([1, 2], index=Categorical(["foo", "bar"]))
b = Series([4, 3], index=Categorical(["baz", "bar"]))

res = pd.concat([a, b])
exp = Series([1, 2, 4, 3], index=["foo", "bar", "baz", "bar"])

tm.assert_equal(res, exp)