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Software Engineering

398The Purpose of Testing: Confidence and Feedback
399Testing as a Design Tool
400The Cost of Bugs: Finding Issues Early
401When to Write Tests: Before, During, or After
402What to Test: Risk-Based Testing
403When Not to Test: Diminishing Returns
404Testing as Documentation
405Enabling Refactoring with Tests
406Balancing Testing Investment
407The Testing Pyramid Concept
408Why Pyramid Shape Matters
409The Cost-Confidence Trade-off
410The Ice Cream Cone Anti-pattern
411Test Distribution Guidelines
412The Testing Trophy Alternative
413Adapting the Pyramid to Your Context
414Moving Tests Down the Pyramid
415Unit Tests: Testing in Isolation
416Integration Tests: Testing Module Interactions
417End-to-End Tests: Testing Complete User Flows
418Acceptance Tests: Validating Business Requirements
419Regression Tests: Preventing Old Bugs
420Performance and Load Tests: Testing Under Stress
421Security Tests: Finding Vulnerabilities
422Contract Tests: Testing API Boundaries
423Smoke and Sanity Tests: Quick Health Checks
424Exploratory Testing: Human-Driven Discovery
425The Cost of Writing and Maintaining Tests
426The Cost of Not Testing
427Finding the Testing Sweet Spot
428Test ROI and Prioritization
429When to Skip or Delete Tests
430Testing in Time-Constrained Projects
431Long-Term Test Economics

Software Engineering

398The Purpose of Testing: Confidence and Feedback
399Testing as a Design Tool
400The Cost of Bugs: Finding Issues Early
401When to Write Tests: Before, During, or After
402What to Test: Risk-Based Testing
403When Not to Test: Diminishing Returns
404Testing as Documentation
405Enabling Refactoring with Tests
406Balancing Testing Investment
407The Testing Pyramid Concept
408Why Pyramid Shape Matters
409The Cost-Confidence Trade-off
410The Ice Cream Cone Anti-pattern
411Test Distribution Guidelines
412The Testing Trophy Alternative
413Adapting the Pyramid to Your Context
414Moving Tests Down the Pyramid
415Unit Tests: Testing in Isolation
416Integration Tests: Testing Module Interactions
417End-to-End Tests: Testing Complete User Flows
418Acceptance Tests: Validating Business Requirements
419Regression Tests: Preventing Old Bugs
420Performance and Load Tests: Testing Under Stress
421Security Tests: Finding Vulnerabilities
422Contract Tests: Testing API Boundaries
423Smoke and Sanity Tests: Quick Health Checks
424Exploratory Testing: Human-Driven Discovery
425The Cost of Writing and Maintaining Tests
426The Cost of Not Testing
427Finding the Testing Sweet Spot
428Test ROI and Prioritization
429When to Skip or Delete Tests
430Testing in Time-Constrained Projects
431Long-Term Test Economics

← Software Engineering

Lesson 419 of 1,933·12. Testing FundamentalsPro lesson

Regression Tests: Preventing Old Bugs

Understand regression testing that ensures previously fixed bugs stay fixed and existing functionality doesn't break with new changes.

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