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What Is Software Testing?
Verifying code works correctly and keeps working.
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AiTechWorlds
AiTechWorlds
Software testing verifies that code works correctly and keeps working as it changes. This visual guide covers unit, integration, and end-to-end tests, the testing pyramid, TDD, mocking, and code coverage.
Verifying code works correctly and keeps working.
Catch bugs early and change code safely.
Automated tests run fast and repeatedly.
Test small pieces in isolation.
Test how parts work together.
Test the whole app like a user.
Many unit, fewer integration, few E2E.
Write the test first, then the code.
Fail, pass, then clean up.
Structure clear, readable tests.
Replace dependencies with fakes.
Control and observe test behavior.
How much code your tests exercise.
High coverage doesn’t guarantee quality.
Bugs hide in unusual inputs.
Stop old bugs from returning.
Run tests automatically on every change.
Unreliable tests erode trust.
Fast, isolated, and deterministic.
Write unit tests for your core logic first.
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