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Introduction to API Automation with Rest Assured
Setup and Configuration
Learning Outcome
3
2
1
Understand the role of API automation in modern software testing
Understand what Rest Assured
Why it is widely used for automating REST APIs?
4
Understand project structure for automation frameworks
3
Configure build tools such as Maven or Gradle
2
Set up an IDE like Eclipse IDE or IntelliJ IDEA
1
Install and configure Java (JDK) for automation
5
Understand project structure for automation frameworks
4
Set up a Rest Assured project using Java and required dependencies.
What is API Testing?
In simple terms, API testing checks whether systems communicate with each other properly and return the expected results.
API Testing is a type of software testing that verifies whether Application Programming Interfaces (APIs) are working correctly.
It focuses on validating the requests, responses, data accuracy, and business logic between different software systems without interacting with the user interface.
The Warehouse processes the request
A request is sent to the warehouse
When you place an order:
the package is delievered to you
Think about a package delivery service
In API communication
In Software Testing
Applications communicate with each other using APIs.
Instead of manually checking these communications, testers create automation scripts.
Rest Assured works like the automation assistant
It automatically sends API requests, checks responses, and ensures everything works as expected
Why API Automation is Important
Benefits of API automation include:
Faster execution compared to manual testing
​
Early detection of defects in the backend layer
​
Easy integration with CI/CD pipelines
​
Ability to test large numbers of API scenarios repeatedly
Automating API tests helps teams validate backend functionality quickly and efficiently.
Since APIs operate behind the UI, testing them early helps identify issues before they affect the user interface.
Manual vs Automation API Testing
What is REST Assured ?
(Public API)
REST Assured is a Java-based API automation testing framework designed specifically for testing RESTful APIs
Built on top of Java HTTP clients like Apache HttpClient, it integrates with popular testing frameworks.
Write tests that are easy to understand and maintain.
Validate response data in various formats with ease
Versatile framework for multiple testing scenarios
Fluent and readable syntax
JSON/XML assertions
Functional and integration testing
Why Use REST Assured?
Java Developer Friendly
Easy to learn with a familiar syntax for Java developers.
BDD-Style Syntax
Write tests that read like natural language specifications
Why Use REST Assured?
Method Chaining
Seamlessly works with continuous integration pipelines
CI/CD Integration
Create readable test flows with intuitive method chains
Maven Project Setup
1.Prepare Tools
Install Java JDK 8+, Eclipse/IntelliJ IDEA, and Apache Maven
2.Create Project
Open IDE and create a new Maven project.
3.Configure Details
Set Group ID and Artifact ID for your project.
4.Structure Folders
Organize with src/main/java and src/test/java folders
Organize with src/main/java and src/test/java folders
Add Dependencies in pom.xml
Add these dependencies to your pom.xml file inside the dependencies block. Always use the latest stable versions from Maven Central.
Setup and Configuration for REST Assured
Build and Validate Project
Maven will automatically download dependencies.
Save pom.xml
Execute a simple test to confirm proper setup.
Run Sample Test
Check External/Referenced Libraries in your IDE
Verify Libraries
Choosing Between TestNG and JUnit
Recommended Project Structure
Contains actual test classes with API verifications.
Shared setup and configuration class
Helper classes for JSON parsing and token generation.
This structure ensures clean, maintainable test architecture as your project grows.
Tests
Base
Utils
Best Practices for Setup
Keep base URI and common headers in a shared base class. This centralizes common settings
Use properties files for environment-specific configs. Enables easy switching between test environments
Base Configuration
Environment Properties
Modular Design
Create reusable test components. Use Hamcrest for readable assertions
Summary
4
Manual testing is useful for quick checks,automation suits large-scale testing
3
Tools like Rest Assured simplify and enhance API test automation
2
API Automation ensures faster and reliable testing
1
API testing validates system communication and data accuracy
Quiz
Which of the following is a benefit of API automation?
A. Slower execution
B. Requires more manual effort
C. Faster and repeatable testing
D. Only used for UI testing
Quiz-Answer
Which of the following is a benefit of API automation?
A. Slower execution
B. Requires more manual effort
D. Only used for UI testing
C. Faster and repeatable testing
API Automation with Rest Assured Setup and Configuration
By Content ITV
