Spring Boot testing with WireMock

DemoGatewayTest.java

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.web.client.TestRestTemplate;
import org.springframework.http.ResponseEntity;
import org.wiremock.spring.EnableWireMock;

import static com.github.tomakehurst.wiremock.client.WireMock.*;
import static org.junit.jupiter.api.Assertions.*;

@SpringBootTest(
        classes = DemoGatewayTest.AppConfiguration.class,
        webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@EnableWireMock
class DemoGatewayTest {
    @Value("${wiremock.server.baseUrl}")
    private String wireMockUrl;

    @Autowired
    private TestRestTemplate restTemplate;

    @Test
    @DisplayName("ทำการจำลอง GET /ping แล้ว return ค่า pong กลับมา")
    void case01() {
        // Arrange
        stubFor(get("/ping").willReturn(ok("pong")));
        // Act
        ResponseEntity<String> response = restTemplate.getForEntity(wireMockUrl + "/ping", String.class);
        // Assert
        assertEquals("pong", response.getBody());
    }

    @Test
    @DisplayName("ทำการจำลอง GET /ping แล้ว return status code = 404 กลับมา")
    void case02() {
        // Arrange
        stubFor(get("/ping").willReturn(notFound()));
        // Act
        ResponseEntity<String> response = restTemplate.getForEntity(wireMockUrl + "/ping", String.class);
        // Assert
        assertEquals(404, response.getStatusCode().value());
    }

    @Test
    @DisplayName("ทำการจำลอง GET /ping ให้ช้ากว่า โดย return ผลกลับมาภายในเวลา 5 วินาที")
    void case03() {
        // Arrange
        stubFor(get("/ping").willReturn(ok("pong").withFixedDelay(5000)));
        // Act
        ResponseEntity<String> response = restTemplate.getForEntity(wireMockUrl + "/ping", String.class);
        // Assert
        assertEquals("pong", response.getBody());

    }

    @SpringBootApplication
    static class AppConfiguration {
    }
}