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Test driven-development

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David Paluy
David Paluy

Test Driven Development Why and How

TechnologyEconomy & Finance
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TDD – Test Driven Development David Paluy June 15, 2008
Agenda ,[object Object],[object Object],[object Object]
T est D riven D evelopment ,[object Object],[object Object]
When do we need to write tests? If my code works perfectly, why should I write tests for it?
Realization 1: ,[object Object]
Confidence ,[object Object],[object Object],[object Object],[object Object]
When do we need to write tests? So, if the code works perfectly, and I’m never going to change it, then why should I write tests?
Realization 2: ,[object Object]
If I write my test first : ,[object Object],[object Object],[object Object]
The TDD process ,[object Object],[object Object],[object Object]
The TDD process RED GREEN REFACTOR
The TDD process Write the tests Write code until tests pass Try to optimize the code
When do we need to write tests? So, if the code works perfectly, and I’m never going to change it, and the design is already flawless, then why should I write tests?
Realization 3: ,[object Object],[object Object]
Yoga Instructions ,[object Object],[object Object],[object Object],[object Object],[object Object]
Yoga Instructions
Yoga Instructions Examples > Comments
When do we need to write tests? So, if the code works perfectly, and I’m never going to change it, and the design is already flawless and it is totally readable and understandable, then why should I write tests?
The moral
Learning T est D riven D evelopment
The Goal
Software Test Hierarchy ,[object Object],FIT – F ramework for I ntegrated T ests nUnit – C# jUnit – Java bMock – C++ Unit Tests Integrated Tests Acceptance Tests Endurance Tests Stress Tests
Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example: Credit Card Submition ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example: Charge Credit Card ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example: Charge Credit Card ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
T est D riven D evelopment ,[object Object],[object Object],[object Object]
T est D riven D evelopment ,[object Object],[object Object],[object Object]
T est D riven D evelopment ,[object Object],[object Object],[object Object],[object Object]

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Test driven-development

  • 1. TDD – Test Driven Development David Paluy June 15, 2008
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  • 4. When do we need to write tests? If my code works perfectly, why should I write tests for it?
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  • 7. When do we need to write tests? So, if the code works perfectly, and I’m never going to change it, then why should I write tests?
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  • 11. The TDD process RED GREEN REFACTOR
  • 12. The TDD process Write the tests Write code until tests pass Try to optimize the code
  • 13. When do we need to write tests? So, if the code works perfectly, and I’m never going to change it, and the design is already flawless, then why should I write tests?
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  • 18. When do we need to write tests? So, if the code works perfectly, and I’m never going to change it, and the design is already flawless and it is totally readable and understandable, then why should I write tests?
  • 20. Learning T est D riven D evelopment
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