How to make a JUnit test for a handler

[Fernando Jordán Silva]

Just a simple question: how can I make a unit test (not integration) of a Handler class ?

Example code: 

public void handle(final HttpServerRequest request) {

    request.bodyHandler(new Handler<Buffer>() {

        @Override

        public void handle(Buffer buffer) {

            // Code to test
        }
    });
}

[Joern Bernhardt]

Create a class for the Handler:

class HttpServerRequestBodyHandler extends Handler<Buffer> {

  @Override
  public void handle(Buffer buffer) {

    ...
  }
}

... and test it by calling theHandler.handle(yourUnitTestBuffer); ?

[Fernando Jordán Silva]

Yes, that's right for simple objects like Buffer but if the handler is this:

@Override

public void handle(final HttpServerRequest request) {

    // code to test
}

How can I test it ? 

[Joern Bernhardt]

If you really don't want to do integration tests for things like that, I guess you need to mock the HttpServerRequest with something like Mockito. I'm not aware of a better way right now, because of that we're testing our modules mostly via integration tests.

[Stream Liu]

Yes, you may need a mock, but you can use vert.x API directly,
such as create http server in your test.
you could learn more from test case of Vert.x

--
Stream Liu

Blog: www.streamis.me

[松节油]

I use Mockito. use a mocked HttpServerRequest,  custom Answer for bodyHandler to save the handler object, then call it.

like this:

mockRequst = mock(HttpServerRequest.class);

doAnswer(new Answer() {
    public Object answer(InvocationOnMock invocation) {
        Object[] args = invocation.getArguments();

        parentClass.this.saveHandler(args[0]);    //save handler
        Mock mock = invocation.getMock();
        return null;
    }
}).when(mockRequst).bodyHandler(any(Handler.class));

handle(mockRequest);

//test
this.getHandler().handle(mockBuffer);

在 2013年11月22日星期五UTC+8下午8时52分28秒，Fernando Jordán Silva写道：