Unit tests for web layers involve testing the Controllers--REST and otherwise.

We recommend the following:

• Using Mock MVC for web layers built on Spring MVC
• Jersey Test Framework is a good choice for REST Services built using Jersey and JAX-RS

A quick example of setting up the Mock MVC framework is shown as follows:

    @RunWith(SpringRunner.class)
    @WebMvcTest(TodoController.class)
    public class TodoControllerTest {
      @Autowired
      private MockMvc mvc;
      @MockBean
      private TodoService service;
      //Tests
    }

Using @WebMvcTest will allow us to use autowire MockMvc and execute web requests. A great feature of @WebMVCTest is that it only instantiates the controller components. All other Spring components are expected to be mocked and can be autowired using @MockBean.