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Test for preserved dtype during datetime roundtrip #10159

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13 changes: 13 additions & 0 deletions xarray/tests/test_coding_times.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1304,6 +1304,19 @@
np.testing.assert_equal(actual, expected)


def test_roundtrip_float32_datetime():
expected = np.array([1867128, 1867134, 1867140], dtype="float32")
units = "hours since 1800-01-01"
calendar = "standard"

arr = decode_cf_datetime(expected, units=units, calendar=calendar, use_cftime=False)
actual, _, _ = encode_cf_datetime(
arr, units=units, calendar=calendar, dtype=expected.dtype
)
np.testing.assert_equal(actual, expected)
assert actual.dtype == expected.dtype

Check failure on line 1317 in xarray/tests/test_coding_times.py

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GitHub Actions / ubuntu-latest py3.10 bare-minimum 

test_roundtrip_float32_datetime

AssertionError: assert dtype('float64') == dtype('float32')
 +  where dtype('float64') = array([1867128., 1867134., 1867140.]).dtype
 +  and   dtype('float32') = array([1867128., 1867134., 1867140.], dtype=float32).dtype

Check failure on line 1317 in xarray/tests/test_coding_times.py

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GitHub Actions / ubuntu-latest py3.12 all-but-dask 

test_roundtrip_float32_datetime

AssertionError: assert dtype('float64') == dtype('float32')
 +  where dtype('float64') = array([1867128., 1867134., 1867140.]).dtype
 +  and   dtype('float32') = array([1867128., 1867134., 1867140.], dtype=float32).dtype

Check failure on line 1317 in xarray/tests/test_coding_times.py

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GitHub Actions / macos-latest py3.13 

test_roundtrip_float32_datetime

AssertionError: assert dtype('float64') == dtype('float32')
 +  where dtype('float64') = array([1867128., 1867134., 1867140.]).dtype
 +  and   dtype('float32') = array([1867128., 1867134., 1867140.], dtype=float32).dtype

Check failure on line 1317 in xarray/tests/test_coding_times.py

View workflow job for this annotation

GitHub Actions / ubuntu-latest py3.13 all-but-numba 

test_roundtrip_float32_datetime

AssertionError: assert dtype('float64') == dtype('float32')
 +  where dtype('float64') = array([1867128., 1867134., 1867140.]).dtype
 +  and   dtype('float32') = array([1867128., 1867134., 1867140.], dtype=float32).dtype

Check failure on line 1317 in xarray/tests/test_coding_times.py

View workflow job for this annotation

GitHub Actions / ubuntu-latest py3.10 

test_roundtrip_float32_datetime

AssertionError: assert dtype('float64') == dtype('float32')
 +  where dtype('float64') = array([1867128., 1867134., 1867140.]).dtype
 +  and   dtype('float32') = array([1867128., 1867134., 1867140.], dtype=float32).dtype

Check failure on line 1317 in xarray/tests/test_coding_times.py

View workflow job for this annotation

GitHub Actions / ubuntu-latest py3.10 min-all-deps 

test_roundtrip_float32_datetime

AssertionError: assert dtype('float64') == dtype('float32')
 +  where dtype('float64') = array([1867128., 1867134., 1867140.]).dtype
 +  and   dtype('float32') = array([1867128., 1867134., 1867140.], dtype=float32).dtype

Check failure on line 1317 in xarray/tests/test_coding_times.py

View workflow job for this annotation

GitHub Actions / macos-latest py3.10 

test_roundtrip_float32_datetime

AssertionError: assert dtype('float64') == dtype('float32')
 +  where dtype('float64') = array([1867128., 1867134., 1867140.]).dtype
 +  and   dtype('float32') = array([1867128., 1867134., 1867140.], dtype=float32).dtype

Check failure on line 1317 in xarray/tests/test_coding_times.py

View workflow job for this annotation

GitHub Actions / ubuntu-latest py3.13 

test_roundtrip_float32_datetime

AssertionError: assert dtype('float64') == dtype('float32')
 +  where dtype('float64') = array([1867128., 1867134., 1867140.]).dtype
 +  and   dtype('float32') = array([1867128., 1867134., 1867140.], dtype=float32).dtype


@pytest.mark.parametrize("time_unit", ["ms", "us", "ns"])
def test_decode_float_datetime_with_decimals(
time_unit: PDDatetimeUnitOptions,
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