rspec02

Rspec

Ch2

在 project 中加入 rspec

Gemfile

group :development, :test do 
  gem 'rspec-rails'
end

然後跑

• bundle install
• rails generate rspec:install

Configuration

spec/spec_helper.rb

Dir[Rails.root.join("spec/support/**/*.rb")].each {|f| require f}
# ( require all helper files within spec/support)
….
Rspec.configure do |config|
  config.mock_with :mocha
  # allows you to change the default mocking framework
end

Output

rspec --color spec/models/zombie_spec.rb

rspec --color --format documentation spec/models/zombie_spec.rb

如果不想每次都打，可以在專案的 .rspec 下先預先存好

--color
--format documentation

Runing Specs

• rspec # 跑全部的
• rspec spec/modles/ 跑整個目錄
• rspec spec/models/zombie_spec.rb 跑單個檔案
• rspec spec/models/zombie_spec.rb:4 跑最近一行的 test example

Model spec

spec/model/zombie_spec.rb

require 'spec_helper'
describe Zombie do
  it 'is invalid without a name' do
    zombie = Zombie.new
    zombie.should_not be_valid # predicate matcher
  end
end

app/models/zombie.rb

class Zombie < ActiveRcord::Base
  validates :name, :presence => true
end

Matchers: match

spec/modles/zombie_spec.rb

describe Zombie do
  it "has a name that matches 'Ash Clone`" do
    zombie = Zombie.new(:name => "Ash Clone 1")
    zombie.name.should match(/Ash Clone \d/)
  end

Matchers: match

spec/modles/zombie_spec.rb

describe Zombie do
  it "include tweets" do
    tweet1 = Tweet.new(:status => "Uuuuuuhhhhh")
    tweet2 = Tweet.new(:status => "Arrrgggg")
    zombie = Zombie.new(:name => "Ash", :tweets => [tweet1,tweet2])
    zombie.tweets.should include(tweet1)
    zombie.tweets.should include(tweet2)
    # matching on an array,       # is this Tweet inside tweets ?
  end

Matchers: have

spec/modles/zombie_spec.rb

describe Zombie do
  it "starts with two weapons" do
    zombie = Zombie.new(:name => "Ash")
    # zombie.weapons.count.should == 2
    zombie.should have(2).weapons
  end

還可以使用

• have(n)
• have_at_least(n)
• have_at_most(n)

Matchers: change

spec/modles/zombie_spec.rb

describe Zombie do
  it 'changes  the number of Zombies' do
    zombiee = Zombie.new(:name => "Ash")
    expect { zombie.save}.to change { Zombie.count }.by(1)
      # runs before and after expect        # results are compared
  end

可以使用

• by(n)
• from(n)
• to(n)
• from(1).to(5)

raise_error

spec/modles/zombie_spec.rb

describe Zombie do
  it "raise an aerror if saved without a name" do
    zombie = Zombie.new
    expect { zombie.save! }.to rais_error(
      ActiveRcord::RecordInvalid
    end
    # optionally pass in an exception
  end

• to
• not_to
• to_not

More matchers

• respond_to(<method_name>)
• be_within().of()
• exist
• satisfy{ }
• be_kind_of()
• be_an_instance_of()

@zombie.should respond_to(hungry?) @width.should be_within(0..1).of(33.3) @zombie.should exsit @zombie.should satisfy { |zombie| zombie.hungry? } @hungry_zombie.should be_kind_of(Zombie) @status.should be_an_instance_of(String)