def test_add_request_handler_chain_throw_error_for_null_chain(self):
test_exception_mapper = GenericExceptionMapper(exception_handlers=None)
with self.assertRaises(DispatchException) as exc:
test_exception_mapper.add_exception_handler(None)
assert "Input is not an AbstractExceptionHandler instance" in str(
exc.exception
), ("Exception Mapper didn't throw error during add_exception_handler "
"method call when "
"an invalid Exception Handler is passed")
def test_add_exception_handler_for_valid_handler_type(self):
test_exception_handler = mock.MagicMock(spec=AbstractExceptionHandler)
test_exception_mapper = GenericExceptionMapper(exception_handlers=None)
test_exception_mapper.add_exception_handler(test_exception_handler)
assert test_exception_mapper.exception_handlers == [
test_exception_handler
], ("Exception Mapper throws exception when a valid Exception Handler "
"is provided in the "
"add_handler method")
def test_dispatch_raise_low_level_exception_when_no_suitable_exception_handler_registered(
self):
test_request_handler = mock.MagicMock(spec=AbstractRequestHandler)
test_request_handler.can_handle.return_value = True
test_request_handler.handle.return_value = "Test Response"
test_request_handler_chain = GenericRequestHandlerChain(
request_handler=test_request_handler)
test_request_mapper = GenericRequestMapper(
request_handler_chains=[test_request_handler_chain])
test_adapter = mock.MagicMock(spec=GenericHandlerAdapter)
test_adapter.supports.return_value = True
test_adapter.execute.side_effect = Exception(
"Test low level Exception")
test_exception_handler = mock.MagicMock(spec=AbstractExceptionHandler)
test_exception_handler.can_handle.return_value = False
test_exception_mapper = GenericExceptionMapper(
exception_handlers=[test_exception_handler])
self.test_dispatcher.request_mappers = [test_request_mapper]
self.test_dispatcher.handler_adapters = [test_adapter]
self.test_dispatcher.exception_mapper = test_exception_mapper
with self.assertRaises(Exception) as exc:
self.test_dispatcher.dispatch(
handler_input=self.valid_handler_input)
assert "Test low level Exception" in str(exc.exception), (
"Dispatcher didn't throw low level exception when request "
"dispatch throws exception and "
"no suitable exception handler is registered")
def test_no_handler_registered_for_custom_exception(self):
test_handler_input = TestDispatchInput(request="test_input")
test_exception_handler = mock.MagicMock(spec=AbstractExceptionHandler)
test_exception_handler.can_handle.return_value = False
test_exception_mapper = GenericExceptionMapper(
exception_handlers=[test_exception_handler])
test_custom_exception = DispatchException("Test Custom Exception")
assert test_exception_mapper.get_handler(
handler_input=test_handler_input,
exception=test_custom_exception) is None, (
"get_handler in Generic Exception Mapper found an unsupported "
"exception handler for "
"handler input and custom exception")
def test_exception_mapper_initialization_with_handler_list_containing_null_throw_error(
self):
with self.assertRaises(DispatchException) as exc:
test_exception_mapper = GenericExceptionMapper(
exception_handlers=[None])
assert "Input is not an AbstractExceptionHandler instance" in str(
exc.exception
), ("Exception Mapper didn't throw error during initialization when a "
"Null handler is passed")
def test_get_handler_registered_for_custom_exception(self):
test_handler_input = TestDispatchInput(request="test_input")
test_exception_handler_1 = mock.MagicMock(
spec=AbstractExceptionHandler)
test_exception_handler_1.can_handle.return_value = False
test_exception_handler_2 = mock.MagicMock(
spec=AbstractExceptionHandler)
test_exception_handler_2.can_handle.return_value = True
test_exception_mapper = GenericExceptionMapper(exception_handlers=[
test_exception_handler_1, test_exception_handler_2
])
test_custom_exception = DispatchException("Test Custom Exception")
assert test_exception_mapper.get_handler(
handler_input=test_handler_input, exception=test_custom_exception
) == test_exception_handler_2, (
"get_handler in Generic Exception Mapper found incorrect request "
"exception handler for "
"input and custom exception")
def test_exception_mapper_initialization_with_handler_list_containing_valid_handler(
self):
test_exception_handler = mock.MagicMock(spec=AbstractExceptionHandler)
test_exception_mapper = GenericExceptionMapper(
exception_handlers=[test_exception_handler])
assert test_exception_mapper.exception_handlers == [
test_exception_handler
], ("Exception Mapper initialization throws exception when a valid "
"Handler is provided in the "
"exception handlers list")
def test_exception_mapper_initialization_with_handler_list_containing_invalid_handler_throw_error(
self):
test_invalid_handler = mock.Mock()
with self.assertRaises(DispatchException) as exc:
test_exception_mapper = GenericExceptionMapper(
exception_handlers=[test_invalid_handler])
assert "Input is not an AbstractExceptionHandler instance" in str(
exc.exception
), ("Exception Mapper didn't throw error during initialization when "
"an invalid handler is passed")
def test_dispatch_process_handled_exception_when_suitable_exception_handler_registered(
self):
test_request_handler = mock.MagicMock(spec=AbstractRequestHandler)
test_request_handler.can_handle.return_value = True
test_request_handler.handle.return_value = "Test Response"
test_request_handler_chain = GenericRequestHandlerChain(
request_handler=test_request_handler)
test_request_mapper = GenericRequestMapper(
request_handler_chains=[test_request_handler_chain])
test_adapter = mock.MagicMock(spec=GenericHandlerAdapter)
test_adapter.supports.return_value = True
test_adapter.execute.side_effect = DispatchException(
"Custom dispatch exception")
test_exception_handler_1 = mock.MagicMock(
spec=AbstractExceptionHandler)
test_exception_handler_1.can_handle.return_value = False
test_exception_handler_2 = mock.MagicMock(
spec=AbstractExceptionHandler)
test_exception_handler_2.can_handle.return_value = True
test_exception_handler_2.handle.return_value = "Custom exception " \
"handler response"
options = RuntimeConfiguration(
request_mappers=[test_request_mapper],
handler_adapters=[test_adapter],
exception_mapper=GenericExceptionMapper(exception_handlers=[
test_exception_handler_1, test_exception_handler_2
]))
self.test_dispatcher = GenericRequestDispatcher(options=options)
assert self.test_dispatcher.dispatch(
handler_input=self.valid_handler_input
) == "Custom exception handler response", (
"Dispatcher didn't handle exception when a suitable exception handler is registered"
)
test_exception_handler_1.handle.assert_not_called(), (
"Incorrect Exception Handler called when handling custom "
"exception")
test_exception_handler_2.handle.assert_called_once(), (
"Suitable exception handler didn't handle custom exception")
def test_exception_mapper_with_null_input(self):
test_exception_mapper = GenericExceptionMapper(exception_handlers=None)
assert test_exception_mapper.exception_handlers == [], (
"Exception Mapper instantiated empty list of exceptions handlers "
"when no input provided")