Difference between system, Integration and E2E test

 

• Difference between system, Integration and E2E test:

The differences between System Testing, Integration Testing, and End-to-End (E2E) Testing:

1. 1. System Testing:

   • Definition: System Testing is conducted on a complete, integrated system to verify its compliance with specified requirements and to assess its overall functionality.
   • Scope: It focuses on testing the entire software system as a whole entity, including all its components, modules, and interfaces.
   • Objective: The primary goal is to ensure that the system meets the defined functional and non-functional requirements and behaves as expected from the end-user's perspective.
   • Timing: System Testing typically occurs after Integration Testing and before User Acceptance Testing (UAT) in the software development lifecycle.
   • Example: In an e-commerce platform, system testing may involve testing the end-to-end purchase process, including browsing products, adding items to the cart, processing payments, and generating order confirmations.

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3. 2. Integration Testing:

   • Definition: Integration Testing verifies the interactions and interfaces between integrated components or modules within the system.
   • Scope: It focuses on testing the connections and data exchanges between various software modules or subsystems, ensuring they work seamlessly together.
   • Objective: Integration Testing aims to uncover defects in the interactions and interfaces between components, identifying integration issues early in the development process.
   • Timing: Integration Testing typically occurs after Unit Testing and before System Testing, ensuring that individual modules integrate correctly before testing the entire system.
   • Example: In an e-commerce platform, integration testing may involve testing the interaction between the user authentication module and the product catalog module to ensure that user credentials are correctly validated when accessing product information.

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5. 3. End-to-End (E2E) Testing:

   • Definition: End-to-End Testing evaluates the complete flow of a system, simulating real-world user scenarios from start to finish.
   • Scope: It encompasses testing the entire application stack, including the user interface, backend systems, databases, and external integrations.
   • Objective: E2E Testing ensures that all components of the system work together seamlessly to deliver the desired functionality and user experience.
   • Timing: E2E Testing typically occurs after Integration Testing and before System Testing, focusing on validating end-to-end business processes and user journeys.
   • Example: In an e-commerce platform, E2E testing may involve simulating the entire process of a user searching for a product, adding it to the cart, proceeding to checkout, making a payment, and receiving an order confirmation.

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In summary, while System Testing evaluates the overall behavior of the complete system, Integration Testing focuses on the interactions between integrated components, and End-to-End Testing validates the entire system's functionality across various user scenarios. Each type of testing plays a crucial role in ensuring the quality, reliability, and functionality of software systems.