API test tools overview in Testing Fundamentals - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to send a GET request using Postman.

Testing Fundamentals

pm.sendRequest({ method: '[1]', url: 'https://api.example.com/data' }, function (err, res) { console.log(res.json()); });

Drag options to blanks, or click blank then click option'

APUT

BPOST

CGET

DDELETE

Attempts:

3 left

💡 Hint

Common Mistakes

Using POST instead of GET for fetching data.

The GET method is used to retrieve data from the API. Postman uses this method to send a request and get a response.

2fill in blank

medium

Complete the code to check the status code in a response using REST-assured (Java).

Testing Fundamentals

given().when().get("/users").then().statusCode([1]);

Drag options to blanks, or click blank then click option'

A200

B404

C500

D302

Attempts:

3 left

💡 Hint

Common Mistakes

Using 404 which means not found.

Status code 200 means the request was successful. REST-assured uses statusCode() to verify this.

3fill in blank

hard

Fix the error in the Postman test script to assert the response status is 200.

Testing Fundamentals

pm.test("Status code is 200", function () { pm.response.to.have.status([1]); });

Drag options to blanks, or click blank then click option'

A200

B201

C404

D"OK"

Attempts:

3 left

💡 Hint

Common Mistakes

Using string "OK" instead of number 200.

The status method expects the numeric status code 200 to check for success.

4fill in blank

hard

Fill both blanks to create a JSON body and send it with a POST request using REST-assured.

Testing Fundamentals

given().contentType("application/json").body([1]).when().post("/create").then().statusCode([2]);

Drag options to blanks, or click blank then click option'

A{"name":"John"}

B201

C200

D{"id":1}

Attempts:

3 left

💡 Hint

Common Mistakes

Using 200 instead of 201 for creation.

The JSON body must be a string with the data. Status code 201 means resource created successfully.

5fill in blank

hard

Fill all three blanks to extract a JSON field and assert its value in a Postman test script.

Testing Fundamentals

pm.test("Check user name", function () { let jsonData = pm.response.json(); pm.expect(jsonData.[1]).to.eql([2]); pm.expect(pm.response.code).to.equal([3]); });

Drag options to blanks, or click blank then click option'

Auser.name

B"John"

C200

Dusername

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong JSON path or missing quotes around string.

jsonData.user.name accesses the name field. The expected value is "John". The status code should be 200 for success.

Practice

1. Which of the following is a popular tool used for manual API testing with a user-friendly interface?

easy

A. Selenium

B. JUnit

C. Postman

D. JMeter

Solution

1. Step 1: Identify tools for API testing

   Postman is widely known as a manual API testing tool with a graphical interface.

2. Step 2: Differentiate from other tools

   JUnit is for unit testing, Selenium for UI testing, and JMeter for performance testing, not primarily manual API testing.

3. Final Answer:

   Postman -> Option C

4. Quick Check:

   Manual API testing tool = Postman [OK]

Hint: Postman = manual API testing with GUI [OK]

Common Mistakes:

• Confusing JUnit as an API testing tool
• Thinking Selenium is for API testing
• Assuming JMeter is mainly for API functional testing

2. Which command-line tool is commonly used to send HTTP requests for API testing?

easy

A. docker

B. npm

C. git

D. curl

Solution

1. Step 1: Identify command-line tools related to HTTP requests

   curl is a command-line tool designed to send HTTP requests and test APIs.

2. Step 2: Exclude unrelated tools

   npm manages Node.js packages, git manages source code, and docker manages containers, none are for HTTP requests.

3. Final Answer:

   curl -> Option D

4. Quick Check:

   Command-line HTTP tool = curl [OK]

Hint: curl sends HTTP requests from terminal [OK]

Common Mistakes:

• Confusing npm with API testing
• Thinking git can send HTTP requests
• Assuming docker is for API calls

3. Consider this REST-assured Java code snippet for API testing:

given().when().get("https://api.example.com/users/1").then().statusCode(200);

What does this test check?

medium

A. The API returns status code 200 for user with ID 1

B. The API returns a list of all users

C. The API creates a new user

D. The API returns status code 404 for user with ID 1

Solution

1. Step 1: Analyze the HTTP method and URL

   The code uses GET on endpoint /users/1, which typically fetches user with ID 1.

2. Step 2: Check the assertion on status code

   The test expects the response status code to be 200, meaning success.

3. Final Answer:

   The API returns status code 200 for user with ID 1 -> Option A

4. Quick Check:

   GET /users/1 expects 200 = The API returns status code 200 for user with ID 1 [OK]

Hint: GET + statusCode(200) means successful fetch [OK]

Common Mistakes:

• Thinking it creates a user (POST needed)
• Assuming it fetches all users (no list endpoint)
• Confusing 404 with 200 status code

4. You wrote this curl command to test an API:

curl -X GET https://api.example.com/data -d '{"id":5}'

What is wrong with this command?

medium

A. GET requests should not have a request body (-d option)

B. The URL is missing the protocol

C. The HTTP method should be POST, not GET

D. The JSON data is missing a closing brace

Solution

1. Step 1: Understand HTTP GET request rules

   GET requests usually do not have a body; sending data with -d is ignored or causes errors.

2. Step 2: Check other parts of the command

   The URL includes protocol https://, JSON is properly closed, and GET is valid method for fetching data.

3. Final Answer:

   GET requests should not have a request body (-d option) -> Option A

4. Quick Check:

   GET with body (-d) is invalid [OK]

Hint: GET requests don't send data in body (-d) [OK]

Common Mistakes:

• Thinking URL lacks protocol
• Assuming POST is required here
• Missing JSON brace (actually present)

5. You want to automate API tests that check multiple endpoints with different HTTP methods and validate JSON responses. Which tool is best suited for this task?

hard

A. Postman manual runner

B. REST-assured

C. curl command line only

D. Browser developer tools

Solution

1. Step 1: Identify automation needs

   Testing multiple endpoints with various HTTP methods and validating JSON requires scripting and assertions.

2. Step 2: Match tool capabilities

   REST-assured is a Java library designed for automated API testing with rich validation support.

3. Step 3: Exclude less suitable tools

   Postman manual runner is not fully automated, curl lacks built-in assertions, and browser tools are for debugging, not automation.

4. Final Answer:

   REST-assured -> Option B

5. Quick Check:

   Automated API testing with assertions = REST-assured [OK]

Hint: REST-assured = automated API tests with assertions [OK]

Common Mistakes:

• Choosing Postman manual runner for automation
• Using curl without assertion support
• Relying on browser tools for automated tests