The controller we want to test is BasicController. The convention to create a unit test is a class name with the Test suffix . We will create a test class named BasicControllerTest.

The basic setup is shown as follows:

   public class BasicControllerTest { 

      private MockMvc mockMvc; 

      @Before 
      public void setup() { 
         this.mockMvc = MockMvcBuilders.standaloneSetup(new BasicController()).build(); 
      } 
   
}

The following definitions explain the workings of the preceding code block:

• mockMvc: This variable can be used across different tests. So, we define an instance variable of the MockMvc class.
• @Before setup: This method is run before every test in order to initialize MockMvc.
• MockMvcBuilders.standaloneSetup(new BasicController()).build(): This line of code builds a MockMvc instance. It initializes DispatcherServlet to serve requests to the controller(s) configured, BasicController, in this instance.