API Testing Questions and Answers (Level-2)

Question 3: What are the different types of testing in API testing?

Answer:
API testing includes multiple testing strategies to ensure complete coverage:

• Positive Testing – Valid input, expected successful response.
  
• Negative Testing – Invalid or missing input to test error handling.
  
• Boundary Testing – Tests with minimum and maximum limits (e.g., character length).
  
• Security Testing – Ensures APIs reject unauthorized access.
  
• Performance Testing – Checks API stability under load (JMeter, k6).
  
• Contract Testing – Validates schema, fields, and data types using tools like Swagger or Pact.
  

This classification helps in designing robust API automation test cases with proper coverage.

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Question 4: What tools are commonly used for API testing?

Answer:
API testing tools are categorized based on use cases:

• Manual Testing:
  
  • Postman, Insomnia – Easy UI-based testing
    
• Automation Testing:
  
  • Rest Assured (Java) – Best for TestNG/JUnit automation
    
  • Karate (Java) – Combines API and UI testing with BDD
    
  • Supertest (JS) – For Node.js APIs
    
  • Requests (Python) – Lightweight for scripting
    
• Performance Testing:
  
  • JMeter, k6 – Test performance under load
    
• Contract Testing:
  
  • Swagger, Pact – Validate API specifications and schema
    

Choosing the right tool based on the tech stack and test objective is critical for efficient API testing.

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