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Merged
merged 6 commits into from
Jun 20, 2020
Merged

TST: Ensure dtypes are set correctly for empty integer columns #24386 #34886

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66433d5
TST: Ensure dtypes are set correctly for empty integer columns #24386
avinashpancham Jun 20, 2020
feb7680
Add comment to refer to GH issue tracker
avinashpancham Jun 20, 2020
3c2f72b
Refactor check, use == instead of is
avinashpancham Jun 20, 2020
8c68294
Moved file to test_constructors.py and added test for other dtypes
avinashpancham Jun 20, 2020
9a41ab8
Add support for more dtypes
avinashpancham Jun 20, 2020
d2dfa8b
Refactor testing for data types using containers in _testing.py
avinashpancham Jun 20, 2020
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27 changes: 27 additions & 0 deletions pandas/tests/frame/test_constructors.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2245,6 +2245,33 @@ def test_from_records_empty_with_nonempty_fields_gh3682(self):
tm.assert_index_equal(df.index, Index([], name="id"))
assert df.index.name == "id"

@pytest.mark.parametrize(
"dtype",
tm.ALL_INT_DTYPES
+ tm.ALL_EA_INT_DTYPES
+ tm.FLOAT_DTYPES
+ tm.COMPLEX_DTYPES
+ tm.DATETIME64_DTYPES
+ tm.TIMEDELTA64_DTYPES
+ tm.BOOL_DTYPES,
)
def test_check_dtype_empty_numeric_column(self, dtype):
# GH24386: Ensure dtypes are set correctly for an empty DataFrame.
# Empty DataFrame is generated via dictionary data with non-overlapping columns.
data = pd.DataFrame({"a": [1, 2]}, columns=["b"], dtype=dtype)

assert data.b.dtype == dtype

@pytest.mark.parametrize(
"dtype", tm.STRING_DTYPES + tm.BYTES_DTYPES + tm.OBJECT_DTYPES
)
def test_check_dtype_empty_string_column(self, dtype):
# GH24386: Ensure dtypes are set correctly for an empty DataFrame.
# Empty DataFrame is generated via dictionary data with non-overlapping columns.
data = pd.DataFrame({"a": [1, 2]}, columns=["b"], dtype=dtype)

assert data.b.dtype.name == "object"

def test_from_records_with_datetimes(self):

# this may fail on certain platforms because of a numpy issue
Expand Down