TestRestTemplate for full integration in Spring Boot - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is TestRestTemplate used for in Spring Boot testing?

<p><code>TestRestTemplate</code> is a helper class in Spring Boot used to perform full integration tests by sending HTTP requests to a running server and receiving responses. It simulates real client calls to your REST API.</p>

beginner

How do you inject TestRestTemplate in a Spring Boot test?

<p>You can inject <code>TestRestTemplate</code> by adding it as a field with <code>@Autowired</code> in a test class annotated with <code>@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)</code>.</p>

intermediate

What does SpringBootTest.WebEnvironment.RANDOM_PORT do?

This setting starts the Spring Boot application on a random free port during tests. It allows TestRestTemplate to send real HTTP requests to the running server without port conflicts.

beginner

How do you send a GET request using TestRestTemplate?

<p>Use the method <code>getForEntity(url, responseType)</code> where <code>url</code> is the endpoint and <code>responseType</code> is the expected class of the response body.</p>

intermediate

Why is TestRestTemplate preferred over RestTemplate in Spring Boot integration tests?

TestRestTemplate is configured automatically for tests, supports authentication, and integrates with Spring Boot's test environment, making it easier and safer to use in integration tests than the standard RestTemplate.

Which annotation is required to start a Spring Boot app on a random port for TestRestTemplate?

A @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)

B @WebMvcTest

C @DataJpaTest

D @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.MOCK)

Only @SpringBootTest with RANDOM_PORT starts the full app on a random port for real HTTP calls.

How do you perform a POST request with TestRestTemplate?

A postForEntity(url, requestBody, responseType)

B getForEntity(url, responseType)

C exchange(url, HttpMethod.GET, null, responseType)

D delete(url)

Use postForEntity to send POST requests with a body.

What does getForEntity return?

A A raw HTTP connection

B ResponseEntity with status, headers, and body

C Only the HTTP status code

D Only the response body

getForEntity returns a ResponseEntity that contains status, headers, and body.

Which of these is NOT a benefit of using TestRestTemplate?

A Automatic integration with Spring Boot test context

B Supports authentication easily

C Runs tests without starting the server

D Sends real HTTP requests to the app

TestRestTemplate requires the server to be running; it does not mock or skip server startup.

How do you inject TestRestTemplate in your test class?

A Using <code>@MockBean</code>

B Using <code>@Value</code> annotation

C Manually creating new instance

D Using <code>@Autowired</code> annotation

@Autowired injects the configured TestRestTemplate bean automatically.

Explain how TestRestTemplate helps in full integration testing of a Spring Boot REST API.

Think about how a real client talks to your app during tests.

Describe the steps to set up and use TestRestTemplate in a Spring Boot integration test.

Focus on annotations, injection, and usage.