To verify the everything works as expected in a real world scenario, an integration test can be written that, which puts everything together and tests each endpoint. The following is an integration test for the Moviee web service:

@RunWith(SpringRunner::class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
class SpringBoot2MovieRatingApplicationTests {

   @Autowired
   lateinit var webTestClient : WebTestClient;

   @Test
   fun `Get Movies - Happy Path`() {
      webTestClient
            .get()
            .uri("/movies")
            .header("Authorization", getBasicAuthorization())
            .exchange()
            .expectStatus()
            .isOk()
            .expectBody()
            .json("""[{"id":1,"title":"Titanic","year":1999,"genre":
           {"name":"Romantic","description":"Romantic"},"cast":
           [{"name":"Lionardo Dicaprio","inAs":"Jack","noOfAwards":1},
           {"name":"Kate Winslet","inAs":"Rose","noOfAwards":2}]}]""");
   }

The preceding code snippet performs the integration testing for the Get Movies scenario's happy path:

   @Test
   fun `Get Movies - Failure Path (No Authorization)`() {
      webTestClient
            .get()
            .uri("/movies")
            .exchange()
            .expectStatus()
            .isUnauthorized()
   }   

The preceding code snippet performs the integration testing for the Get Movies scenario's failure path:

   @Test
   fun `Get Movie - Happy Path`() {
      webTestClient
            .get()
            .uri("/movies/1")
            .header("Authorization", getBasicAuthorization())
            .exchange()
            .expectStatus()
            .isOk()
            .expectBody()
            .json("""{"id":1,"title":"Titanic","year":1999,"genre":
            {"name":"Romantic","description":"Romantic"},"cast":
           [{"name":"Lionardo Dicaprio","inAs":"Jack","noOfAwards":1},
          {"name":"Kate Winslet","inAs":"Rose","noOfAwards":2}]}""")

   }

The preceding code snippet performs the integration testing for the Get Movie scenario's happy path:

   @Test
   fun `Rate Movie - Happy Path`() {
      webTestClient
            .put()
            .uri("/movies/1/rate?comment=Ok Movie&rating=3")
            .header("Authorization", getBasicAuthorization())
            .exchange()
            .expectStatus()
            .isOk()
            .expectBody()
            .json("""{"id":1,"title":"Titanic","year":1999,"genre":
         {"name":"Romantic","description":"Romantic"},"ratings":
         [{"comment":"Good Movie","rating":5},{"comment":"Ok 
         Movie","rating":3}],"cast":[{"name":"Lionardo 
         Dicaprio","inAs":"Jack","noOfAwards":1},{"name":"Kate 
         Winslet","inAs":"Rose","noOfAwards":2}]}""")
   }

The preceding code snippet performs the integration testing for the Rate Movie scenario's happy path:

fun getBasicAuthorization() : String {
      val plainCreds = "user:password"
      val plainCredsBytes = plainCreds.toByteArray()
      val base64CredsBytes = 
      Base64.getEncoder().encode(plainCredsBytes);
      val base64Creds = String(base64CredsBytes)

      return "Basic $base64Creds";
   }

}

The preceding code snippet returns the Base64 encoded username and password to be sent as part of the authorization header.

The preceding integration test class is annotated with @SpringBootTest, which configures a webEnvironment that will start on a random port. By using WebTestClient, each particular endpoint can be invoked with a proper basic authentication header and verified responses. Integration tests are used to test from end to end before deploying to production.