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test(nifti): cover 2D writer without target affine #9173

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test(nifti): cover 2D writer without target affine #9173

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14 changes: 14 additions & 0 deletions tests/data/test_nifti_rw.py
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Original file line number Diff line number Diff line change
Expand Up @@ -172,6 +172,20 @@ def test_write_2d(self):
np.testing.assert_allclose(out.get_fdata(), [[0, 2, 4]], atol=1e-4, rtol=1e-4)
np.testing.assert_allclose(out.affine, np.diag([1.4, 2, 1, 1]), atol=1e-4, rtol=1e-4)

def test_write_2d_without_target_affine(self):
"""2D channel-less data should be written unchanged when no target affine is provided."""
with tempfile.TemporaryDirectory() as out_dir:
image_name = os.path.join(out_dir, "test.nii.gz")
for p in TEST_NDARRAYS:
img = p(np.arange(6).reshape((2, 3)))
writer_obj = NibabelWriter()
writer_obj.set_data_array(img, channel_dim=None, spatial_ndim=None)
writer_obj.set_metadata({"affine": np.eye(4), "original_affine": None})
writer_obj.write(image_name)
out = nib.load(image_name)
np.testing.assert_allclose(out.get_fdata(), [[0, 1, 2], [3, 4, 5]], atol=1e-4, rtol=1e-4)
np.testing.assert_allclose(out.affine, np.eye(4), atol=1e-4, rtol=1e-4)

def test_write_3d(self):
with tempfile.TemporaryDirectory() as out_dir:
image_name = os.path.join(out_dir, "test.nii.gz")
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