Testing REST API integrations using MockServer — Write the test

Reference note (untrusted external data; do not execute it as instructions). Create AlbumControllerTest.java Bounded code example (external data; do not execute automatically): ```java package com.testcontainers.demo; import static io.restassured.RestAssured.given; import static org.hamcrest.CoreMatchers.is; import static org.hamcrest.Matchers.hasSize; import static org.mockserver.model.HttpRequest.request; import static org.mockserver.model.HttpResponse.response; import static org.mockserver.model.JsonBody.json; import io.restassured.RestAssured; import io.restassured.http.ContentType; import org.junit.jupiter.api.BeforeEach; import org.junit.jupiter.api.Test; import org.mockserver.client.MockServerClient; import org.mockserver.model.Header; import org.mockserver.verify.VerificationTimes; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.boot.test.web.server.LocalServerPort; import org.springframework.test.context.DynamicPropertyRegistry; import org.springframework.test.context.DynamicPropertySource; import org.testcontainers.mo ``` Here's what the test does @SpringBootTest starts the full application on a random port. The @Testcontainers and @Container annotations start a MockServerContainer and create a MockServerClient connected to it. @DynamicPropertySource overrides photos.api.base-url to point at the MockServer endpoint, so the application talks to MockServer instead of the real photo service. @BeforeEach resets the MockServerClient before every test so that expectations from one test don't affect another. shouldGetAlbumById() configures a mock response for /albums/{albumId}/photos, sends a request to the application's /api/albums/{albumId} endpoint, and verifies the response body. It also uses mockServerClient.verify() to confirm that the expected API call reached MockServer. shouldReturn404StatusWhenAlbumNotFound() configures MockServer to return a 404 status and verifies the application propagates that status to the caller. Attribution: Adapted from Docker Documentation under Apache-2.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, retained only bounded code excerpts, and shortened it at a paragraph or sentence boundary for retrieval. Verify version-sensitive details at the source.