Test Driven Development

Introduction

Costs

The cost of software according to this course was Tests are split into three categories

• Does what was asked for
• Responds appropriately to bad input
• Acceptable Performance

Red Green Refactor

Start by writing tests with no code, write until test pass, refactor code. This is an iterative approach.

Benefits

• Requirements are verified by the tests
• Regression issues raised early
• Costs of maintenance is lowered
• Design first, when writing the tests first we are designing what they want
• Reduces over engineering
• Easy to know where you are in the project