setattr(Test_graphers_analyzers, test_func_name, test_func)
 
 list_graphers = timeside.core.processor.processors(timeside.core.api.IGrapher)
-module = 'timeside.plugins.grapher.render_analyzers'
+from timeside.core.grapher import DisplayAnalyzer
 grapher_analyzers = [grapher for grapher in list_graphers
-                     if grapher.__module__ == module]
+                     if grapher.__base__ == DisplayAnalyzer]
+
 _tests_factory(grapher_analyzers)
 
 if __name__ == '__main__':
 
                grapher_id=None, grapher_name=None,
                background=None, staging=False):
 
+        if analyzer_parameters is None:
+            analyzer_parameters = {}
+
         class NewGrapher(cls):
 
             _id = grapher_id
 
             __doc__ = """Image representing """ + grapher_name
 
-        NewGrapher.__name__ = 'Display' + '.' + result_id
+        NewGrapher.__name__ = grapher_name
 
         return NewGrapher