test: Skip plotting tests without data

Author: effigies

niworkflows/interfaces/tests/test_plotting.py

@@ -28,9 +28,14 @@
 
 from niworkflows import viz
 from niworkflows.interfaces.plotting import _get_tr
-from niworkflows.tests.data import load_test_data
 from niworkflows.utils.timeseries import _cifti_timeseries, _nifti_timeseries
 
+try:
+    from niworkflows.tests.data import load_test_data
+except ImportError:
+    import pytest
+    pytest.skip('niworkflows installed as wheel, data excluded')
+
 
 def test_cifti_carpetplot():
     """Exercise extraction of timeseries from CIFTI2."""