What is Integration Testing? (Software Testing Interview Question #13)

 What is Integration Testing? 

Software testing levels

• Unit testing
• Integration testing
• System testing
• Acceptance testing

What is integration testing

• Testing of interface between different units, modules, or system
• Combine the multiple units as a single unit and then check the data flow or communication between the modules.
• Tester or developer both can perform this testing
• Eample Integration at unit level: units are grouped logically and tested
• Perfomed by Developer

• Example integration at the modules level: Register and login functionality

  Performed by testers
• Example Integration at system level: e-commerce application and payment gateway
• Performed by testers

Types of integration testing

1. Incremental integraion testing
2. Non-increment integration testing

Types of Incremental Integration Testing

• Top-down integration testing

Stubs are used in this

• Bottom-up integration testing

Drivers are used in this

• Sandwich integration testing

Stubs and drivers are both used in this

Types of Non-incremental Integration testing

• Big bang integration testing

Thanks

Rajat Bhatti

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