Node.js in Practice

Chapter 10. Tests: The key to confident code

This chapter covers

• Assertions, custom assertions, and automated testing
• Ensuring things fail as expected
• Mocha and TAP
• Testing web applications
• Continuous integration
• Database fixtures

Imagine that you wanted to add a new currency to an online shop. First you’d add a test to define the expected calculations: subtotal, tax, and the total. Then you’d write code to make this test pass. This chapter will help you learn how to write tests by looking at Node’s built-in features for testing: the assert module and test scripts that you can set in your package.json file. We also introduce two major test frameworks: Mocha and node-tap.

Introduction to testing

This chapter assumes you ...