Add regression test.

Author: tsalo

src/smriprep/utils/tests/test_bids.py

@@ -1,14 +1,20 @@
+import pytest
 from niworkflows.utils.testing import generate_bids_skeleton
 
 from ..bids import collect_derivatives
 from . import DERIV_SKELETON
 
 
-def test_collect_derivatives(tmp_path):
+@pytest.fixture
+def deriv_dset(tmp_path):
     deriv_dir = tmp_path / 'derivatives'
     generate_bids_skeleton(deriv_dir, str(DERIV_SKELETON))
+    return deriv_dir
+
+
+def test_collect_derivatives(deriv_dset):
     output_spaces = ['MNI152NLin2009cAsym', 'MNIPediatricAsym:cohort-3']
-    collected = collect_derivatives(deriv_dir, '01', output_spaces)
+    collected = collect_derivatives(deriv_dset, '01', output_spaces)
     for suffix in ('preproc', 'mask', 'dseg'):
         assert collected[f't1w_{suffix}']
     assert len(collected['t1w_tpms']) == 3
@@ -28,3 +34,13 @@ def test_collect_derivatives(tmp_path):
         'sphere_reg_msm',
     ):
         assert len(collected[surface]) == 2
+
+
+def test_collect_derivatives_transforms(deriv_dset):
+    output_spaces = ['MNI152NLin2009cAsym', 'MNIPediatricAsym:cohort-3']
+    collected = collect_derivatives(deriv_dset, '01', output_spaces)
+    xfms = collected['transforms']
+    for space in output_spaces:
+        template = space.split(':')[0]
+        assert template in xfms[space]['reverse']
+        assert template in xfms[space]['forward']