Testing Legacy Code

• Please turn off all
• What is Legacy Code?
• Benefits of Test Driven Development are Well Known
• But Not All Code Starts From a Clean Slate
• Old Code Must be Maintained
• Can We Apply Test First Techniques When
• The Answer is Yes, We Can
• You Need To Give Up a Few Things
• Give Up #1: 100% Test Coverage
• Give Up #2: Unit Tests
• Give Up #3: Frequent context switches
• What TDD ideas do we keep?
• What technology do we keep?
• Getting Started
• Testing main() method
• Add fixtures
• What Tests do you Already Have?
• Converting Existing Tests
• Characterization Testing
• Testing by Functional Division
• What to Test?
• Testing by Code Structure
• Top Down
• Code Coverage Measurements?
• Code Coverage Tools
• How code coverage works
• A Code Coverage Report
• Package Level Coverage
• Line Level Coverage
• Auto generating tests
• Static Analysis
• Test or debug?
• How to decide
• Refactoring
• Summing Up
• To Learn More
• Questions?

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