TEST: Validate expected ndim behavior

Author: effigies

nibabel/tests/test_image_api.py

@@ -202,6 +202,7 @@ def validate_data_interface(self, imaker, params):
         # Check get data returns array, and caches
         img = imaker()
         assert_equal(img.shape, img.dataobj.shape)
+        assert_equal(len(img.shape), img.dataobj.ndim)
         assert_data_similar(img.dataobj, params)
         for meth_name in self.meth_names:
             if params['is_proxy']:

nibabel/tests/test_proxy_api.py

@@ -108,6 +108,14 @@ def validate_shape(self, pmaker, params):
         # Read only
         assert_raises(AttributeError, setattr, prox, 'shape', params['shape'])
 
+    def validate_ndim(self, pmaker, params):
+        # Check shape
+        prox, fio, hdr = pmaker()
+        assert_equal(prox.ndim, len(params['shape']))
+        # Read only
+        assert_raises(AttributeError, setattr, prox,
+                      'ndim', len(params['shape']))
+
     def validate_is_proxy(self, pmaker, params):
         # Check shape
         prox, fio, hdr = pmaker()