Difference between system, Integration and E2E test




System testing, integration testing, and end-to-end (E2E) testing are three different levels of testing in the software development life cycle, each serving a specific purpose and focusing on different aspects of the application.

  1. System Testing:

    • Scope: System testing evaluates the entire system as a whole. It verifies that all components/modules are integrated correctly and function together as expected.
    • Objective: The primary goal is to ensure that the entire system meets the specified requirements and behaves as intended in a real-world environment.
    • Focus: It focuses on testing the system's functionalities, performance, security, and other non-functional aspects.

  2. Integration Testing:

    • Scope: Integration testing is concerned with the interactions between different modules or components of the system. It tests the interfaces and interactions between integrated components.
    • Objective: The main objective is to identify and address issues related to the integration of individual components, ensuring that they work seamlessly together.
    • Focus: It focuses on the correct flow of data between integrated modules and the detection of any inconsistencies in the interaction.

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

    • Scope: E2E testing evaluates the entire application from start to finish. It involves testing the application in a real-world scenario, simulating user interactions and the complete user journey.
    • Objective: The primary goal is to ensure that all components and systems work together to deliver the intended functionality from the user's perspective.
    • Focus: E2E testing is user-centric and focuses on scenarios that mimic real-world usage, including user interfaces, databases, networks, and other external dependencies.

It's important to note that these testing levels are not mutually exclusive, and a comprehensive testing strategy often involves a combination of these approaches to ensure thorough coverage of the software.


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