System Testing and Integration Testing are two critical phases in the software testing process, each serving distinct purposes.
System Testing is a comprehensive evaluation of the entire software application, ensuring it meets specified requirements and functions as intended.
It focuses on the system as a whole, simulating real-world usage scenarios to identify and rectify any issues.
Integration Testing, on the other hand, concentrates on the interactions between integrated components or modules.
It verifies that these interconnected elements work together seamlessly, detecting any conflicts or discrepancies that may arise during integration.
Now let’s see the difference between System Testing and Integration Testing.
| Aspect | System Testing | Integration Testing |
|---|---|---|
| Focus | Tests the entire system as a whole. | Tests interactions between integrated components or modules. |
| Scope | Broad in scope, covering all functionalities. | Focused on specific interfaces and interactions. |
| Testing Level | Higher level testing. | Lower level testing. |
| Testing Objective | Validate the entire system meets specified requirements. | Verify that integrated components work together as expected. |
| Dependencies | No need for actual external systems or services. | Requires interfaces and connections to external components. |
| Components Tested | Treats the system as a black box. | Tests interactions between specific integrated components. |
| Test Data | Uses realistic data to simulate real-world scenarios. | Can use mock data to isolate integration points. |
| Defect Identification | Identifies system-level defects and issues. | Identifies issues related to data flow and interactions. |
| Execution Environment | Requires a complete, standalone environment for testing. | Can be executed in a controlled environment with stubs. |
| Timing in SDLC | Conducted after Integration Testing. | Precedes System Testing in the testing phase. |
| Testing Techniques | Black Box Testing, Acceptance Testing, Load Testing, etc. | Top-Down Testing, Bottom-Up Testing, Big Bang Testing, etc. |
| Test Documentation | Test Plan, Test Cases, Test Summary Report, etc. | Integration Test Plan, Integration Test Cases, etc. |
| Purpose | To ensure the entire system works as expected. | To verify that integrated components interact correctly. |
| Bugs Detected | Higher level issues related to system functionalities. | Interface issues, data flow problems, and module conflicts. |
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