Integration testing validates that individual modules or components work together correctly when combined. It focuses on testing interfaces, data flow, and communication between integrated components rather than individual unit functionality.
Key Objectives:
Interface Validation: Ensures proper data exchange between components
Communication Testing: Verifies protocols and message formats
Data Flow Verification: Confirms correct data transformation across boundaries
Dependency Management: Tests how components handle shared resources
End-to-End Functionality: Validates complete business processes
Why It's Critical:
Detects integration-specific bugs not found in unit testing
Validates system architecture and design decisions
Ensures components meet integration contracts
Provides confidence before system-level testing
Rewriting in plainer words…
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