Question 1

How to send a POST request with JSON body using REST Assured?

Accepted Answer

Use `given().contentType(ContentType.JSON).body(jsonString).when().post(url)`. REST Assured can serialize Java objects automatically if Jackson is available, and you can validate responses with `then().body(...)` for assertions.

Question 2

REST Assured or Postman – which is better for API testing?

Accepted Answer

REST Assured excels in automated, code-based tests integrated into CI/CD pipelines for Java projects, while Postman is better for manual exploration and team collaboration. Choose based on automation needs versus interactive testing.

Question 3

How to test OAuth2 secured endpoints with REST Assured?

Accepted Answer

Use `auth().oauth2(accessToken)` for bearer token authentication. For full OAuth2 flows, you may need to obtain the token separately first, as REST Assured focuses on request-level auth rather than token generation.

Question 4

Can I use REST Assured with JUnit 5?

Accepted Answer

Yes, REST Assured works seamlessly with JUnit 5. You can use it in `@Test` methods and set up base configurations in `@BeforeEach` methods, such as base URIs or authentication, for reusable test setups.

Question 5

How to mock responses with REST Assured for unit testing?

Accepted Answer

REST Assured itself doesn't mock responses; it's for real HTTP calls. For mocking, integrate with tools like WireMock or use the Spring MockMvc integration to test controllers without a live server, as mentioned in the documentation.

Question 6

What are the performance implications of using REST Assured in large test suites?

Accepted Answer

REST Assured adds some overhead due to its DSL and Groovy dependency. To optimize performance, minimize unnecessary assertions, reuse request configurations, and consider parallel test execution to reduce suite run times.

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