junit-5

1. @ExtendWith

   It is similar to Runners in Junit 5 , Extensions Receives
   the  callback notifications to manage our application context

2. @SpringBootTest

   It is  used to test any testClass to integrate in
    spring boot application, It Searches the class path
    to find the spring annotated beans including configuration
    classes

3. @AutoConfigureMockMvc

   It enables the automatic configurations of a new MockMvc
   Instance
   

4. @MockBean

    It is defined in the spring boot test classes, and creates
    the mock implementation of product service
    using ** MOCKITO **