Beginners' Guide to Writing Jasmine Tests in CoffeeScript
Start with src/Calculator.coffee:
class Calculator
constructor: ->
console.log "Instantiated new Calculator instance"
add: (num1, num2) ->
num1 + num2
subtract: (num1, num2) ->
num1 - num2
multiply: (num1, num2) ->
num1 * num2
divide: (num1, num2) ->
num1/num2Now, spec/CalculatorSpec.coffee:
describe 'Calculator', () ->
calc = {}
beforeEach ->
calc = new Calculator()
it 'should be able to add two numbers', () ->
expect(calc.add 3,4 ).toBe 7
it 'should be able to subtract two numbers', () ->
expect(calc.subtract 32,18 ).toBe 14
it 'should be able to multiply two numbers', () ->
expect(calc.multiply 6,4 ).toBe 24
it 'should be able to divide two numbers', () ->
expect(calc.divide 32,8 ).toBe 4
it 'should be able to divide to zero and receive Infinity', () ->
expect(calc.divide 32,0 ).toBe Infinity
it 'should be able to divide to Infinity and receive zero', () ->
expect(calc.divide 32,Infinity ).toBe 0Compile the CoffeeScript files to JavaScript by enabling bare. Otherwise, the code gets wrapped into a function call, which throws Jasmine off
$ coffee -cwb src/Calculator.coffee
$ coffee -cwb spec/CalculatorSpec.coffeeFinally, add the two compiled JavaScript files to the Jasmine runner, SpecRunner.html:
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Jasmine Spec Runner v2.0.0</title>
<link rel="shortcut icon" type="image/png" href="lib/jasmine-2.0.0/jasmine_favicon.png">
<link rel="stylesheet" type="text/css" href="lib/jasmine-2.0.0/jasmine.css">
<script type="text/javascript" src="lib/jasmine-2.0.0/jasmine.js"></script>
<script type="text/javascript" src="lib/jasmine-2.0.0/jasmine-html.js"></script>
<script type="text/javascript" src="lib/jasmine-2.0.0/boot.js"></script>
<!-- include source files here... -->
<script type="text/javascript" src="src/Calculator.js"></script>
<!-- include spec files here... -->
<script type="text/javascript" src="spec/CalculatorSpec.js"></script>
</head>
<body>
</body>
</html>Written by Levent Gurses
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