What is integration testing?

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Integration Testing is a level of software testing where individual modules or components of an application are combined and tested as a group to ensure they work together correctly.

🔹 Why Integration Testing?

When building software, developers first test units (functions, classes, modules) in unit testing. But in real-world applications, these units interact with each other—like APIs connecting to databases, or frontend calling backend services.
👉 Integration testing ensures that these interactions happen smoothly.

🔹 Key Points

1. Focus: Tests how modules interact, not just individual logic.

2. Scope: Bigger than unit testing but smaller than full system testing.

3. Goal: Detect issues in data flow, API calls, and communication between components.

🔹 Example

Imagine a user registration system:

• Unit test → Test the function that validates email format.

• Integration test → Test the whole flow:

  1. User submits signup form.

  2. API stores user in DB.

  3. Confirmation email is sent.

Here, integration testing ensures all these parts work together properly.

🔹 Types of Integration Testing

1. Big Bang → Combine all modules and test at once (hard to debug).

2. Top-Down → Start testing from higher-level modules down to lower ones.

3. Bottom-Up → Test from lower-level modules up to higher ones.

4. Sandwich / Hybrid → Mix of top-down and bottom-up.

🔹 Benefits

• Finds issues in interfaces & communication early.

• Prevents integration bugs before moving to system testing.

• Increases confidence in end-to-end functionality.

✅ In summary:
Integration testing verifies that different parts of an application work together correctly. It focuses on data flow, module interactions, and real use cases beyond isolated unit tests.

Read More :

What are mocks and spies in testing?

What is Jest and how is it used?

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