# Notes

# TEST DRIVEN DEVELOPMENT (TDD)

# What

TDD is a tool for developers that aides in the development of high quality code.

# Why

Benefits for new code:

• TDD encourages more thorough analysis 进行更彻底的分析
• TDD encourages better design 更好的设计
• TDD encourages more modular code 使用更多模块化代码
• TDD encourages more reusable code 使用更多可重用的代码
• TDD encourages more maintainable code 使用更具可维护性的代码
• TDD provides a short feedback cycle 提供了较短的反馈周期

Benefits for existing code:

• Provides automated regression
• Provides automated impact analysis
• Reduces fear of refactoring

Saves time!

# When

• New code
• Utility code
• Legacy code...sometimes
  when time and capacity permits

# JUnit

A tool for test-driven development