Unit Testing vs Unit Testing in Ruby

Reasons you unit test:

• It helps you think out how new code should be designed in Test Driven Development, because you’re actually writing something that uses the code that doesn’t exist yet.
• Regression testing – so you can make sure new code doesn’t open old bugs.
• It enables you to do things like set up a continuous integration and continuous deployment flow that greatly simplifies the process of getting code out to your production server.
• You don’t want The Profound Programmer knocking on your door with a shovel.
• If you use remote APIs, things on the API may change without notice – causing problems.

Reasons you unit test in Ruby:

• No type safety.