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Javascript Specs
with Jasmine
A Primer for Rubyists

Seems like a

lot of work
just for some lousy

regression tests...

Enforces Good Design

•Object Oriented-er
• Modular and Namespaced
• Flexible, Updatable, Reusable

Focus and Process

• Driven by Business
Requirements
• Red, Green, Refactor
• Know When You’re Done

“Free” Documentation

•Legible Output
• Expresses Object Behavior
• Get Devs Up to Speed

Oh yeah...
plus you get a
regression test suite

Friends with RSpec
•Very Similar Syntax
• “BDD” Approach
• Continuous Integration
• Borrows Directory Structure
• Generative Fixture Support

Pals with Ruby / Rails

$ gem install jasmine
$ script/generate jasmine
$ rake jasmine

Jasmine / RSpec
Comparisons
Let’s get cookin’...

Spec Suites
describe Cook do
describe “baking a pie” do
# ...
end
end
RSpec

describe(“Cook”, function() {
describe(“baking pie”, function() {
// ...
});
});
Jasmine

Before / After
before(:each) do
@pie = Pie.new
end

after(:each) { @pie.cleanup }
RSpec

Jasmine
var pie;
beforeEach(function(){
pie = new Pie();
});
afterEach(function() {pie.cleanup()});

Before All / After All
before(:all) { setup_code }
after(:all) { cleanup_code }
describe “something” do
# ... tests here
end
RSpec

setupCode();
describe(“something”, function() {
// ... tests here
});
cleanupCode();
Jasmine

Examples / Expectations
it “should be tasty” do
pie = Pie.new
pie.should be_tasty
end
RSpec

it(“should be tasty”, function() {
var pie = new Pie();
expect(pie).toBeTasty();
});
Jasmine

Negative Expectations
it “should not be burned” do
pie = Pie.new
pie.bake!
pie.should_not be_burned
end
RSpec

it(“should not be burned”, function(){
pie.bake();
expect(pie).not.toBeBurned();
});
Jasmine

Custom Matchers
Spec::Matchers.define :be_burned do
match do |actual|
actual.color == “black”
end
end
RSpec

beforeEach(function() {
this.addMatchers({
toBeBurned: function() {
return this.actual.color == ‘black’;
}
});
});
Jasmine

Stubbing Values
it “should cook until 160 degrees” do
pie = Pie.new
pie.stub!(:temperature).and_return(160)
pie.done_baking?.should be_true
end
RSpec

it(“should cook until 160 degrees”, function() {
spyOn(pie, ‘temperature’).andReturn(160);
expect(pie.doneBaking()).toBeTruthy();
});
Jasmine

Message Expectations
it “should bake a pie for dinner” do
cook = Cook.new
cook.should_receive(:bake_a_pie!)
cook.make_dinner!
end
RSpec

it(“should bake a pie”, function() {
var cook = new Cook();
spyOn(cook, ‘bakePie’);
cook.makeDinner();
expect(cook.bakePie).toHaveBeenCalled();
});
Jasmine

Expectations w/ Args
it “should bake a TASTY pie” do
cook = Cook.new
cook.should_receive(:bake_a_pie!).with(‘TASTY’)
cook.make_dinner!
end
RSpec

it(“should bake a TASTY pie”, function() {
spyOn(cook, ‘bakePie’);
cook.makeDinner();
expect(cook.bakePie)
.toHaveBeenCalledWith(‘TASTY’);
});
Jasmine

Stub Call-Through

RSpec
it(“should bake a TASTY pie”, function() {
spyOn(cook, ‘bakePie’).andCallThrough();
cook.makeDinner();
expect(cook.bakePie)
.toHaveBeenCalledWith(‘TASTY’);
});
Jasmine

Number of Times
it “should check the pie twice” do
cook = Cook.new
cook.should_receive(:check_the_pie).twice
cook.bake_a_pie!
end
RSpec

it(“should check the pie twice”, function() {
spyOn(cook, ‘checkThePie’);
cook.bakePie();
expect(cook.checkThePie.callCount).toEqual(2);
});
Jasmine

Error Expectations
it “should refuse to bake a pie” do
cook = Cook.new(“cranky”)
lambda do
cook.bake_a_pie!
end.should raise_error(MakeYourOwnDamnPie)
end
RSpec

it(“should refuse to bake a pie”, function() {
var cook = new Cook(‘cranky’);
var msg = “Make Your Own Damn Pie!”;
expect(cook.bakePie).toThrow(msg);
});
Jasmine

Simulating Errors
it “should catch errs & retry with sudo” do
cook = Cook.new
cook.stub!(:bake_a_pie!).
and_raise(MakeYourOwnDamnPie)
cook.should_receive(:sudo_bake_a_pie!)
cook.make_dinner!
end
RSpec

Simulating Errors
it(“should retry with sudo”, function() {
spyOn(cook, ‘bakePie’)
.andThrow(“Make Your Own Damn Pie!”);
spyOn(cook, ‘sudoBakePie’);
expect(cook.sudoBakePie).toHaveBeenCalled();
});
Jasmine

Well now that I’m

HUNGRY
let’s write some code...

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Jasmine

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Editor's Notes