Spring MVC mocking

Question

I am trying to use Spring MVC mock module to unit test my controllers. I have added this:

    @Before
    public void beforeTest() {
        MockitoAnnotations.initMocks(this);
        standaloneSetup(new CarController());
    }

which works fine. However I have created a controller advice that have a method annotated with @ExceptionHandler. I want to test that it works during unit testing. I saw that I can build a MockMvc object and pass that to standaloneSetup(..):

MockMvcBuilders.standaloneSetup(
    new CarController()).setHandlerExceptionResolvers(...).build();

However when I do this the test that checks that the exception handler works passes but all the other tests that access the response with jsonpath fails with this error:

java.lang.IllegalStateException: Expected response body to be verified as JSON,
    HTML or XML but content-type 'null' is not supported out of the box.
Try registering a custom parser using:
   RestAssured.registerParser("null", <parser type>);
Content was:

How do I fix this? What is wrong?

Bottom line is that I want to unit test my rest api. How should I do this when I have added a exception handler for instance?

Answer 1

Bottom line is that I want to unit test my rest api. How should I do this when I have added a exception handler for instance?

For one I would use the built in spring mock framework, available from version 3.2, and not rest assured (it might be good, but can;t imagine it is integrated as well). This might cover the basics of getting started.

Secondly, you can just try and catch in your test method, then assert on a boolean as to whether a exception was thrown. Or test for whether an exception message was returned from controller doing an expect on status code 500, for example. This will depend on your api.