[Tests] test error_out & dgpyError

unitTesting/CMakeLists.txt

+# Test bindings
+ADD_PYTHON_UNIT_TEST("test-bindings" "unitTesting/test_bindings.py" src)
+
 # Test the interpreter
 SET(EXECUTABLE_NAME interpreter-test)
 ADD_EXECUTABLE(${EXECUTABLE_NAME} interpreter-test.cc)

unitTesting/test_bindings.py

+import unittest
+
+import dynamic_graph
+
+
+class BindingsTests(unittest.TestCase):
+    def test_bindings(self):
+        with self.assertRaises(Exception) as error:
+            dynamic_graph.error_out()
+            self.assertEqual(str(error), "something bad happend")
+
+
+if __name__ == '__main__':
+    unittest.main()