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TST: added test for joining dataframes with MultiIndex containing dates #46660

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Merged
merged 3 commits into from
Apr 7, 2022
Merged

TST: added test for joining dataframes with MultiIndex containing dates #46660

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b113758
TST: add test_join_multiindex_dates
dospix Apr 6, 2022
3c054ad
update branch with changes from upstream
dospix Apr 6, 2022
eef3078
Merge branch 'main' into add-join-test
dospix Apr 6, 2022
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20 changes: 20 additions & 0 deletions pandas/tests/frame/methods/test_join.py
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Original file line number Diff line number Diff line change
Expand Up @@ -323,6 +323,26 @@ def test_join_multiindex_leftright(self):
tm.assert_frame_equal(df1.join(df2, how="right"), exp)
tm.assert_frame_equal(df2.join(df1, how="left"), exp[["value2", "value1"]])

def test_join_multiindex_dates(self):
# GH 33692
date = pd.Timestamp(2000, 1, 1).date()

df1_index = MultiIndex.from_tuples([(0, date)], names=["index_0", "date"])
df1 = DataFrame({"col1": [0]}, index=df1_index)
df2_index = MultiIndex.from_tuples([(0, date)], names=["index_0", "date"])
df2 = DataFrame({"col2": [0]}, index=df2_index)
df3_index = MultiIndex.from_tuples([(0, date)], names=["index_0", "date"])
df3 = DataFrame({"col3": [0]}, index=df3_index)

result = df1.join([df2, df3])

expected_index = MultiIndex.from_tuples([(0, date)], names=["index_0", "date"])
expected = DataFrame(
{"col1": [0], "col2": [0], "col3": [0]}, index=expected_index
)

tm.assert_equal(result, expected)

def test_merge_join_different_levels(self):
# GH#9455

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