SpeedUp Rspec tests

Couple tips how to speed up you'r tests!

1. Shared examples (it_behaves_like)

	class AgePolicy
	def old_enough?(age)
	age >= 18
	end
	end
	require 'spec_helper'
	describe AgePolicy do
	describe '#old_enough?' do
	it 'returns false if user is 16 years old' do
	policy = AgePolicy.new
	expect(policy.old_enough?(16)).to eq(false)
	end
	it 'returns false if user is 12 years old' do
	policy = AgePolicy.new
	expect(policy.old_enough?(12)).to eq(false)
	end
	it 'returns true if user is 18 years old' do
	policy = AgePolicy.new
	expect(policy.old_enough?(18)).to eq(true)
	end
	it 'returns true if user is 20 years old' do
	policy = AgePolicy.new
	expect(policy.old_enough?(20)).to eq(true)
	end
	end
	end

view raw speed_up_rspec_tests01.rb hosted with ❤ by GitHub

Can be written:

	require 'spec_helper'
	describe AgePolicy do
	describe '#old_enough?' do
	shared_examples 'user eligible for taking an action' do |age|
	it "returns true if user is #{age} years old" do
	policy = AgePolicy.new
	expect(policy.old_enough?(age)).to eq(true)
	end
	end
	shared_examples 'user not eligible for taking an action' do |age|
	it "returns false if user is #{age} years old" do
	policy = AgePolicy.new
	expect(policy.old_enough?(age)).to eq(false)
	end
	end
	it_behaves_like 'user not eligible for taking an action', 16
	it_behaves_like 'user not eligible for taking an action', 12
	it_behaves_like 'user eligible for taking an action', 18
	it_behaves_like 'user eligible for taking an action', 20
	end
	end

view raw speed_up_rspec_tests02.rb hosted with ❤ by GitHub

2. Custom matchers

	class SomeController
	def show
	render json: { success: true }
	end
	end
	describe SomeController do
	describe 'GET #show' do
	it 'returns success response' do
	get :show, id: 11, format: :json
	expect(JSON.parse(response.body)).to eq({success: true})
	end
	end
	end

view raw speed_up_rspec_tests03.rb hosted with ❤ by GitHub

Should be

	expect(response).to be_json_success
	RSpec::Matchers.define :be_json_success do |expected|
	match do |actual|
	json_response = JSON.parse(actual.body)
	expect(json_response['success']).to eq(true)
	end
	end

view raw speed_up_rspec_tests04.rb hosted with ❤ by GitHub

If you have a lot of equal custom matchers - move it to matchers.

3. Associations in factory
If you have a lot associations in model, avoid using it always.

	FactoryGirl.define do
	factory :user do
	contact
	location
	end
	end
	FactoryGirl.define do
	factory :user do
	first_name { "John" }
	last_name { "Doe" }
	trait :with_location do
	location
	end
	end
	end

view raw speed_up_rspec_tests05.rb hosted with ❤ by GitHub

4. Transictions

let! method will create instance for each test.
Try use  let_it_be for creating only one. (like before :all)

	require 'spec_helper'
	describe User do
	let(:user1) { FactoryGirl.create :user }
	let_it_be(:user2) { FactoryGirl.create :user }
	it 'does something' do
	# test with user
	end
	it 'does something' do
	# test with user
	end
	it 'does something' do
	# test with user
	end
	end

view raw speed_up_rspec_tests06.rb hosted with ❤ by GitHub

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