On macOS, mlab.view(figure=_f) returns None under testing backend

surfer/viz.py

@@ -522,22 +522,21 @@ def _toggle_render(self, state, views=None):
         if views is None:
             views = [None] * len(figs)
         for vi, (_f, view) in enumerate(zip(figs, views)):
+            # Testing backend doesn't have these options
+            if mlab.options.backend == 'test':
+                continue
+
             if state is False and view is None:
                 views[vi] = (mlab.view(figure=_f),
-                             # scene is None in testing backend
-                             1 if _f.scene is None else
                              _f.scene.camera.parallel_scale)
 
-            # Testing backend doesn't have this option
-            if mlab.options.backend != 'test':
-                _f.scene.disable_render = not state
+            _f.scene.disable_render = not state
 
             if state is True and view is not None:
                 mlab.draw(figure=_f)
                 with warnings.catch_warnings(record=True):  # traits focalpoint
                     mlab.view(*view[0], figure=_f)
-                if _f.scene is not None:
-                    _f.scene.camera.parallel_scale = view[1]
+                _f.scene.camera.parallel_scale = view[1]
         # let's do the ugly force draw
         if state is True:
             _force_render(self._figures, self._window_backend)