[Tests] checks that connecting a signal to an entity raises an exception

For now, this test doesn't pass, as an exception is not properly fired,
but we get a segfault instead.

unitTesting/CMakeLists.txt

-# Test bindings
-ADD_PYTHON_UNIT_TEST("test-bindings" "unitTesting/test_bindings.py" src)
 
 # Test the interpreter
 SET(EXECUTABLE_NAME interpreter-test)
@@ -59,3 +57,6 @@ TARGET_LINK_LIBRARIES(${PYTHON_MODULE} ${PUBLIC_KEYWORD} ${LIBRARY_NAME} ${PYTHO
 
 ## Test it
 ADD_PYTHON_UNIT_TEST("test-custom-entity" "unitTesting/test_custom_entity.py" src unitTesting)
+
+# also test other bindings, using this custom entity
+ADD_PYTHON_UNIT_TEST("test-bindings" "unitTesting/test_bindings.py" src unitTesting)

unitTesting/test_bindings.py

 import unittest
 
-import dynamic_graph
+import dynamic_graph as dg
+from custom_entity import CustomEntity
 
 
 class BindingsTests(unittest.TestCase):
     def test_bindings(self):
         with self.assertRaises(Exception) as error:
-            dynamic_graph.error_out()
+            dg.error_out()
             self.assertEqual(str(error), "something bad happend")
 
+    def test_type_check(self):
+        first = CustomEntity('first_entity')
+        second = CustomEntity('second_entity')
+        # Check that we can connect first.out to second.in
+        dg.plug(first.signal('out_double'), second.signal('in_double'))
+        # Check that we can't connect first.out to second
+        with self.assertRaises(Exception):
+            dg.plug(first.signal('out_double'), second)
+
 
 if __name__ == '__main__':
     unittest.main()