TestRestTemplate for API testing in JUnit - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a TestRestTemplate instance.

JUnit

TestRestTemplate restTemplate = new [1]();

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ATestRestTemplate

BRestTemplate

CHttpClient

DWebClient

Attempts:

3 left

💡 Hint

Common Mistakes

Using RestTemplate instead of TestRestTemplate.

Using HttpClient or WebClient which are not part of Spring Boot test utilities.

The TestRestTemplate class is used to create a test client for API testing in Spring Boot.

2fill in blank

medium

Complete the code to send a GET request to '/api/users' and get the response as a String.

JUnit

ResponseEntity<String> response = restTemplate.[1]("/api/users", String.class);

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ApostForEntity

Bexchange

Cdelete

DgetForEntity

Attempts:

3 left

💡 Hint

Common Mistakes

Using postForEntity which sends a POST request.

Using delete which sends a DELETE request.

Using exchange without specifying HTTP method.

The getForEntity method sends a GET request and returns the response wrapped in a ResponseEntity.

3fill in blank

hard

Fix the error in the assertion to check if the response status code is 200 OK.

JUnit

assertEquals(HttpStatus.[1], response.getStatusCode());

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AOK

BNOT_FOUND

CBAD_REQUEST

DCREATED

Attempts:

3 left

💡 Hint

Common Mistakes

Using NOT_FOUND (404) or BAD_REQUEST (400) which indicate errors.

Using CREATED (201) which is for resource creation.

The status code HttpStatus.OK corresponds to HTTP 200, which means the request was successful.

4fill in blank

hard

Fill both blanks to send a POST request with a User object and receive a User response.

JUnit

ResponseEntity<User> response = restTemplate.[1]("/api/users", [2], User.class);

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ApostForEntity

BgetForEntity

Cnew User("John", "[e-mail]")

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using getForEntity for POST requests.

Passing null instead of a User object.

The postForEntity method sends a POST request. The second argument is the User object to send in the request body.

5fill in blank

hard

Fill all three blanks to assert the response body has the expected user's email.

JUnit

assertTrue(response.getBody().[1]().[2]("[3]"));

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AgetEmail

Bequals

[e-mail]

DtoString

Attempts:

3 left

💡 Hint

Common Mistakes

Using toString instead of getEmail.

Using '==' instead of equals for string comparison.

Using wrong field name.

We call getEmail() on the User object, then check if it equals the expected email string.