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Welcome to End to End API Testing & Interview Questions Notes, a comprehensive guide designed to assist you in mastering API testing and preparing for technical interviews in API testing roles. With the increasing reliance on APIs in modern software architectures, understanding how to test APIs is becoming more crucial than ever for QA professionals and software testers.

This book is structured to provide both practical knowledge and insights into real-world API testing scenarios. The chapters are meticulously organized to take you from the basics of API testing to advanced topics such as security, performance testing, and automation. Here's a brief overview of the chapters:

Introduction to APIs and API Testing: Understand the fundamentals of APIs and the significance of testing in ensuring the reliability and security of software applications.
Setting Up Your API Testing Environment: Learn how to configure and prepare your environment for efficient API testing, focusing on tools and technologies.
Understanding API Requests and Responses: Gain a detailed understanding of API communication, including request methods, headers, parameters, and response structures.
Security Testing of APIs: Explore key concepts in API security testing, such as authentication, authorization, and vulnerability detection.
Writing Basic API Test Cases: Start writing your first API test cases, including functional and negative test cases.
Automating API Tests: Delve into automating API test cases with tools such as Cucumber and Maven, enabling fast and consistent test execution.
Performance Testing of APIs using JMeter: Learn how to evaluate the performance and load capacity of your APIs using tools like JMeter.
Organizing a Test Framework for API Testing: Discover how to structure a scalable and maintainable API test framework, with practical tips on test organization and data management.
Continuous Integration and Continuous Deployment (CI/CD) with API Testing: Explore how to integrate API testing into a CI/CD pipeline for rapid development cycles, using tools such as GitHub Actions and Jenkins.
Test Driven Development for Spring Microservices with Cucumber: Get hands-on experience with TDD for microservices, learning how to write tests for Spring-based APIs using Cucumber.

Interview Preparation

Each chapter contains a set of interview questions and sample answers, helping you prepare for API testing roles in Backend Engineering, SDET (Software Development Engineer in Test), Software Quality Assurance, and Test Engineering positions. These questions are inspired by my own experiences from years of technical interviews in the United States and other resources.

Over the past seven years, I've meticulously gathered notes and questions from each interview, summarizing them into this guide. Whether you are a fresh graduate or an experienced tester, these notes will help you solidify your understanding of key concepts while giving you the confidence to face any API testing interview.

Who This Notes is For

This book is tailored for:

End-to-end API testers seeking practical insights and automation tips
QA professionals looking to enhance their API testing skills with Cucumber and Java
Candidates preparing for backend testing roles, including SDET, Software Quality Engineers, and Test Engineers
Individuals seeking mock interview questions and answers to prepare for technical interviews

API testing has been increasingly recognized for its efficiency, flexibility, and integration capabilities, making it a vital part of any software testing strategy. I hope this book helps you gain a strong foundation in API testing, and I trust that the included interview questions and answers will be a valuable resource for your career progression.

Happy learning, and good luck with your API testing journey!

Lamhot Siagian

Software Engineer in Test Consultant

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