What is the difference between system testing and integration testing?

Question

Accepted Answer

**System testing** — complete system. **Integration** — component interaction.

**System Testing:**
- Tests complete system.
- End-to-end testing.
- All components integrated.
- Functional and non-functional.
- Black-box testing.

```
System Testing:
- Test complete user login flow
- Test entire checkout process
- Test system performance
- Test security features
```

**Integration Testing:**
- Tests component interaction.
- Tests interfaces.
- Incremental or big bang.
- After unit testing.

```
Integration Testing:
- Test login + database
- Test frontend + backend API
- Test payment + email service
- Test search + database
```

**Key differences:**
- **System** — complete system.
- **Integration** — components.
- **System** — end-to-end.
- **Integration** — interfaces.

Systems Analyst: What is the difference between system testing and integration testing?