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What is Integration Testing?

Integration Testing is a critical phase in the Software Testing process, specifically within Manual Testing. It involves systematically combining different modules or components of a software application to evaluate how they interact with each other. The primary aim is to identify interface defects and issues that may arise when multiple parts of the system are integrated.

Objectives of Integration Testing

  • Detecting and resolving interface issues between integrated components.
  • Ensuring that data flows smoothly across modules.
  • Verifying the overall functionality of the complete system by testing integrated units.

Types of Integration Testing

There are several approaches to Integration Testing, including:

  • Top-down Testing: In this approach, testing begins with higher-level modules, and lower-level modules are integrated later.
  • Bottom-up Testing: Here, testing starts with lower-level modules, and higher-level modules are integrated subsequently.
  • Big Bang Testing: All components are integrated at once, and testing is carried out without incremental integration.
  • Incremental Testing: Components are integrated and tested in small batches until the whole system is complete.

Importance of Integration Testing

Integration Testing plays a vital role in ensuring software reliability and quality. It helps in identifying bugs early in the development lifecycle, reduces the cost of fixing defects, and enhances the overall user experience by delivering a more stable and functional product.

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