2️⃣Integration Testing

A typical software project consists of multiple software modules, coded by different programmers. The purpose of this level of testing is to expose defects in the interaction between these software modules.

✅ What is Integration Testing?

Integration testing 🧪 involves testing combinations of integrated software components or units👥 to determine if they function correctly together as a whole.

The goal is to expose defects in the interfaces and interactions between integrated units.

👀 It verifies:

• Functional 🤖and non-functional behavior👌

• Components call 📞 and access each other's methods😎

• Data is passed between them accurately ✅

• Exceptions are handled properly 🙅‍♀️

✅ Why conduct Integration Testing?

🔑 To find defects in interactions between integrated units:

👉 Unit testing ensures individual components work correctly in isolation

👉 Integration testing ensures they work together as designed

🧿 To verify interfaces between components:

👉 Integration testing focuses on interfaces and interactions

👉 It exposes issues in how units call and pass data to each other

✅ Advantages of Integration Testing

📈 Finds defects earlier

• Integration issues are detected before system testing

👌 Ensures units work together

• In unit testing, units are tested individually

• Integration testing verifies they integrate properly

📊 Detects regression errors

• Regressions often occur at integration points

✅ Disadvantages of Integration Testing

🕛 Time consuming

• Large number of component combinations

🛠 Hard to isolate errors

• Defects may originate from multiple units

💰 Expensive

• Requires integrated environments and resources

In summary, while integration testing adds time and cost, it helps ensure that:

💻 Components interact correctly

👥 Units function together as designed

⚙ Systems integrate without issues

💼 Sample Test Case

Test Case ID	Test Case	Steps	Expected Result	Actual Result	Status
TC-001	Login feature integration	1. Enter valid username	User should be directed to password screen	✅	Pass
		2. Enter valid password	2. User should be directed to home screen