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@SpringBootTest
class TestcontainersDemoApplicationTests {

    public static final String DATABASE_NAME = "/demo-application";
	
    @Autowired
    private UserRepository userRepository;

    private static final MongoDBContainer mongoDBContainer = new MongoDBContainer(DockerImageName.parse("mongo:4.0.10"));

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@DynamicPropertySource
static void registerMongoProperties(DynamicPropertyRegistry registry) {
    registry.add("spring.data.mongodb.uri", () -> mongoDBContainer.getConnectionString() + DATABASE_NAME);
}

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MongoDBContainer mongoDBContainer = new MongoDBContainer(DockerImageName.parse("mongo:4.0.10"));
mongoDBContainer.start();

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public class User {
    @Id
    private String id;
    private String name;
    private int age;

    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }

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public interface UserRepository extends MongoRepository<User, String> {
}

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<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>

<!-- Needed to start the test container-->
<dependency>
    <groupId>org.testcontainers</groupId>
    <artifactId>mongodb</artifactId>
    <version>1.17.6</version>

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...
"response": {
    "status": 200,
    "bodyFileName": "firstResponse.json",
    "headers": {
      "Content-Type": "application/json"
    }
}
...

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{
"request": {
    "method": "GET",
    "url": "/api/first"
  },
  "response": {
    "status": 200,
    "body": "Hello, Sourcelabs!"
  }
}

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WireMockServer wireMockServer = new WireMockServer(wireMockConfig().port(8089));
wireMockServer.start();

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<dependency>
	<groupId>com.github.tomakehurst</groupId>
	<artifactId>wiremock</artifactId>
	<version>2.17.0</version>
	<scope>test</scope>
</dependency>