Testing JavaScript
XP Methodologies
Garrett Smith
Front End Engineer

What is Testing?
• Testing verifies that the system does
what its supposed to

Quality
• Internal Quality - measured by the
programmer
• External Quality - measured by the
customer

Types of Testing
• Unit Testing
• Acceptance Testing
• Internal Quality - is it easy to maintain?
How hard is it to make changes?
• External Quality - does it do what it's
supposed to?

Unit Testing
• A \"unit\" can be an ADT, an Object, or a
function

Costs of not Testing
• Code debt
• Can’t refactor safely

Benefits
• Tests facilitate change
• Good coverage ensures that all code
paths work
• Tests make the cod