Unittests: Make sure layer tests pass with or without workspace

tests/python/render_layer/test_operator_context.py

@@ -88,6 +88,10 @@ class UnitTesting(RenderLayerTesting):
         layer.collections.active_index = 3
         self.assertEqual(layer.collections.active.name, 'scorpion')
 
+        # Change active scene layer (do it for workspace too just to don't get mangled in workspace bugs)
+        scene = bpy.context.scene
+        scene.render_layers.active_index = len(scene.render_layers) - 2
+        self.assertEqual(scene.render_layers.active.name, "Viewport")
         bpy.context.workspace.render_layer = bpy.context.scene.render_layers['Viewport']
 
         # old layer