[ci][TestNodeExecution] add a case to manage Node from script name which contains a run function.

Add also some documentation

pypushflow/test/test_representation.py

@@ -75,23 +75,33 @@ class TestScheme(unittest.TestCase):
 class TestNodeExecution(unittest.TestCase):
     """Insure Node.execute works"""
     def testCase1(self):
+        'test that a specific function from her name can be executed'
         node = Node(processing_pt='pypushflow.test.utils.test_function')
         res = node.execute(node.process_pt, properties={}, input_name='data',
                            input_data={'data': 0})
         self.assertEqual(res, {'data': 2})
 
     def testCase2(self):
+        'test that an callable class can be executed from her name'
         node = Node(processing_pt='pypushflow.test.utils.ProcessingClass1')
         res = node.execute(node.process_pt, properties={}, input_name='data',
                            input_data={'data': 0})
         self.assertEqual(res, {'data': 4})
 
     def testCase3(self):
+        """Test that a class with handler can be executed"""
         node = Node(processing_pt='pypushflow.test.utils.ProcessingClass2')
         res = node.execute(node.process_pt, properties={}, input_name='data',
                            input_data={'data': 0})
         self.assertEqual(res, {'data': 1})
 
+    def testCase4(self):
+        script = 'pypushflow.test.pythonActorTest.run'
+        node = Node(processing_pt=script)
+        res = node.execute(node.process_pt, properties={}, input_name='data',
+                           input_data='pythonActorTest')
+        self.assertEqual(res, {'reply': 'Hello pythonActorTest!'})
+
 
 def suite():
     test_suite = unittest.TestSuite()