Unit testing - but not TDD

Step 1: write logic

Step 2: write tet(s)

Test-Driven Development

Step 1: write test

Step 2: write logic

The 3 Laws of TDD

1. You can’t write any production code until you have first written a failing test.
    
2. You can’t write more of a unit test than is sufficient to fail, and not compiling is failing.
    
3.  You can’t write more production code than is sufficient to pass the currently failing unit test.

Benefits of TDD

• Design

• Reduce Debugging time

• Documentation

• Courage

FIRST Principles

• Fast
• Independent
• Repeatable
• Self-validating
• Timely

Demo