TDD Workshop - JavaScript

Setup

• Node.js
• npm
• Visual Studio Code
• Mocha
• Sinon

Note: If modules installed globally, use npm link module-name in project directory

New Code Exercise: Test Drive Creating a Calculator

• Create a Calculator class with an Add method.
• The method can take 0, 1 or 2 numbers, and will return their sum.
• For example: “” or “1” or “1,2”.
• For an empty string it will return Zero.
• Allow the Add method to handle an unknown amount of numbers.  

Legacy Code Exercise: Test Drive Refactoring an Existing Class

• Create a String Calculator class with an Add method that takes in Strings.
• Inject the String Calculator into the Calculator using a constructor.
• Have the Calculator class delegate to the String Calculator class.

Optional

• Create a Numeric Calculator class with an Add method.
• Inject the Numeric Calculator into the Calculator using a setter method.
• If the Add method is called with string parameters, delegate to the String Calculator; if the Add method is called with numeric parameters, delegate to the Numeric Calculator.

Exercises based on TDD Kata by Roy Osherove