TST: add test on checking objects to concatenate #40822
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lgtm |
jbrockmendel
reviewed
Apr 7, 2021
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| def test_concat_no_items_raises(): | ||
| with pytest.raises(ValueError, match="No objects to concatenate"): |
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is there a reference somewhere of discussion on why this should raise rather than return an empty Series/DataFrame?
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we don't have any other tests for this?
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def test_concat_exclude_none(self):
df = DataFrame(np.random.randn(10, 4))
pieces = [df[:5], None, None, df[5:]]
result = concat(pieces)
tm.assert_frame_equal(result, df)
with pytest.raises(ValueError, match="All objects passed were None"):
concat([None, None])
put near this one
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we don't have any other tests for this?
By grepping I did not find that concat is anywhere invoked on an empty list, besides this new test.
$ grep -oPrn 'concat\(\[\]\)' pandas/tests
pandas/tests/reshape/concat/test_concat.py:606:concat([])
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can you put it next to the test as i indicated above
jreback
requested changes
Apr 7, 2021
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| def test_concat_no_items_raises(): | ||
| with pytest.raises(ValueError, match="No objects to concatenate"): |
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we don't have any other tests for this?
jreback
added
Reshaping
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@jreback I moved the test just above |
jreback
approved these changes
Apr 8, 2021
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thanks @ivanovmg |
JulianWgs
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to JulianWgs/pandas
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Jul 3, 2021
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When looking through the enhancement xref #40820,
I noticed that there was no test checking that the ValueError is raised when concatenating an empty sequence.
Added this test.