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TST: added test_join_multiindex_dates #44200

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zMendes wants to merge 2 commits into from
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TST: added test_join_multiindex_dates #44200

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TST: test_join_multiindex_dates
zMendes Oct 27, 2021
f8fd4e4
Removed unecessary methods from test
zMendes Oct 27, 2021
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23 changes: 23 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 +323,29 @@ 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):
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@jbrockmendel jbrockmendel Oct 27, 2021

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if 'join' is whats being tested here, can you avoid using groupby and first?

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@zMendes zMendes Oct 27, 2021

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Yes, I will change the test

# GH 33692
date = pd.Timestamp(2000, 1, 1).date()

# creates dataframes
df1 = DataFrame({"index_0": 0, "date": date, "col1": [0]})
df2 = DataFrame({"index_0": 0, "date": date, "col2": [0]})
df1 = df1.groupby(by=["index_0", "date"]).first()
df2 = df2.groupby(by=["index_0", "date"]).first()

multi_index = MultiIndex.from_tuples([(0, date)], names=["index_0", "date"])
df3 = DataFrame(index=multi_index, columns=["col3"], data=[0])

expected = (
DataFrame(
{"index_0": 0, "date": date, "col1": [0], "col2": [0], "col3": [0]}
)
.groupby(by=["index_0", "date"])
.first()
)
result = df1.join([df2, df3])
tm.assert_equal(result, expected)

def test_merge_join_different_levels(self):
# GH#9455

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