What is integration testing?

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Integration testing is a software testing level where individual modules or components of an application are combined and tested as a group to check how they interact with each other.

While unit testing verifies each module in isolation, integration testing ensures that when these modules come together, they work correctly as a system. The goal is to detect issues in data flow, interfaces, and dependencies between components.

🔑 Key Points:

• Focus: Testing the interaction between modules, APIs, services, or layers (UI → Service → Database).

• Purpose: To find defects such as mismatched data formats, incorrect API calls, communication failures, or integration logic errors.

• Types of Integration Testing:

  1. Big Bang – All modules are combined at once and tested together.

  2. Incremental – Modules are integrated and tested step by step.

     • Top-Down: Start from higher-level modules and integrate downward.

     • Bottom-Up: Start from lower-level modules and integrate upward.

     • Sandwich/Hybrid: Combination of top-down and bottom-up.

⚡ Example:

Suppose you have an E-commerce app:

• Unit Testing checks:

  • LoginService → validates credentials.

  • PaymentService → processes payments.

• Integration Testing checks:

  • User logs in → session is created correctly.

  • After login, user adds items to cart → total price calculated correctly.

  • Payment → successfully communicates with external payment gateway.

✅ Benefits:

• Ensures modules work together correctly.

• Finds issues early in system communication.

• Reduces risk of defects in later stages (like system or acceptance testing).

👉 In short: Integration testing verifies that combined modules interact properly, ensuring smooth data and control flow across the system.

Read more :

What is Mockito?

How do you write test cases for REST APIs?

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