Login

OTP sent to

REST Assured API Testing

Home > Courses > REST Assured API testing

REST Assured API Testing

Software Testing

Duration
45 Hours

Course Description

              REST Assured is a Java-based library widely used for testing and validating RESTful application programming interfaces (APIs). It simplifies the process of sending HTTP requests to a web server and receiving responses, allowing testers to verify the status code, content, headers, and response time of the requests.

Course Outline For REST Assured API testing

1. Introduction to API testing and REST assured

  • Understanding APIs (Application Programming Interfaces) and their role in modern applications.
  • Defining API testing and its importance in the software development lifecycle.
  • Introduction to REST (Representational State Transfer) and its architectural style for web services.
  • Exploring the concepts of API endpoints, HTTP methods (GET, POST, PUT, DELETE, etc.), status codes, request/response bodies, headers, parameters (path, query), and authentication mechanisms.
  • Overview of REST Assured: features, advantages (readable syntax, easy setup, integration with Java ecosystem), and comparison with other API testing tools like Postman. 

2. Environment setup and configuration

  • Prerequisites for using REST Assured: Java JDK (version 8 or higher), Maven or Gradle as build automation tools, and an IDE (e.g., IntelliJ IDEA or Eclipse) for writing and executing tests.
  • Setting up a Maven or Gradle project: Creating the project structure and adding the necessary REST Assured and testing framework (e.g., TestNG or JUnit) dependencies to the project's pom.xml or build.gradle file.
  • Configuring the testing environment: Setting up global configurations like base URI, base path, authentication credentials, and default headers using REST Assured's fluent API. 

3. Core REST assured functionalities

  • Given-When-Then Syntax: Understanding and applying the Behavior-Driven Development (BDD) style for writing clear and readable test cases.
    • given(): Defining request preconditions (parameters, headers, authentication, request body).
    • when(): Specifying the HTTP method and endpoint for the API request.
    • then(): Asserting the response (status code, headers, body content, response time).
  • HTTP Methods: Implementing GET, POST, PUT, PATCH, and DELETE requests using REST Assured.
  • Response Validation: Validating status codes, response headers, content type, and body content.
  • JSON and XML Handling: Parsing and validating JSON and XML responses using JSONPath and XMLPath.  

4. Advanced REST assured techniques

  • Parameterization: Using @Parameterized annotations or data providers to run the same test with multiple input values for data-driven testing.
  • Serialization and Deserialization: Converting Java objects to JSON/XML (serialization) for request bodies and converting JSON/XML responses to Java objects (deserialization).
  • Authentication and Authorization: Implementing various authentication methods like Basic, OAuth2, and Bearer Token to access secured APIs.
  • Complex JSON/XML Validation: Extracting and asserting specific fields from nested JSON and XML structures using JSONPath and XMLPath.
  • File Uploads and Downloads: Handling file uploads using multipart form data and verifying file downloads.
  • Session and Cookie Handling: Managing sessions and cookies during API tests, especially for stateful APIs.
  • Request and Response Logging: Using REST Assured's logging capabilities to log request and response details for debugging and analysis.
  • Working with Filters: Using filters to intercept and modify requests and responses or add custom logic.
  • Reusable Request and Response Specifications: Creating and reusing common request and response specifications to reduce code duplication and improve test maintainability.
  • Hamcrest Matchers: Using Hamcrest matchers for flexible and expressive assertions. 

5. Integrating REST assured with other tools

  • TestNG/JUnit: Integrating REST Assured tests with TestNG or JUnit for test execution and management.
  • Reporting Tools: Integrating with tools like Allure Reports or ExtentReports to generate detailed and interactive test reports.
  • CI/CD Pipelines: Integrating REST Assured tests into Continuous Integration/Continuous Delivery (CI/CD) pipelines using tools like Jenkins or GitLab CI for automated testing and early bug detection.
  • BDD Frameworks (Optional): Integrating with BDD frameworks like Cucumber to write more readable, behavior-driven API tests. 

6. Best practices and framework development

  • Designing a Robust API Automation Framework: Structuring the framework for maintainability, reusability, and scalability.
  • Best Practices for Writing Maintainable Tests: Using constants, helper methods, external configurations, and version control.
  • Test Data Management: Strategies for handling and managing test data for various scenarios.
  • Debugging and Troubleshooting: Identifying and resolving common issues in API tests.
  • Performance and Security Testing (Introduction): Briefly covering concepts like load testing and security vulnerability checks. 
Enquire Now