Extensions: Fix ViewProvider python interface

src/Mod/Test/Document.py

@@ -234,7 +234,26 @@ class DocumentBasicCases(unittest.TestCase):
         self.Doc.removeObject(obj.Name)
         del obj
     
+  def testExtensionBugViewProvider(self):
 
+    class Layer():
+        def __init__(self, obj):
+            ''' Add the properties '''
+            obj.addExtension("App::GroupExtensionPython", self)
+            
+    class LayerViewProvider():
+      def __init__(self, obj):
+        ''' Add the properties '''
+        obj.addExtension("Gui::ViewProviderGroupExtensionPython", self)
+        obj.Proxy = self
+    
+    obj = FreeCAD.ActiveDocument.addObject("App::FeaturePython","Layer")
+    Layer(obj)
+    LayerViewProvider(obj.ViewObject)
+    self.failUnless(obj.hasExtension("App::GroupExtension"))
+    self.failUnless(obj.ViewObject.hasExtension("Gui::ViewProviderGroupExtension"))
+    self.failUnless(obj.ViewObject.hasExtension("Gui::ViewProviderGroupExtensionPython"))
+     
   def tearDown(self):
     #closing doc
     FreeCAD.closeDocument("CreateTest")