Shoulda Matchers

In rspec test case, there is a very useful gem called 'shoulda-matchers', which can save you a lot of writing test code.

For example:

    it "save itself" do
      video = Video.new(title: "Bones_test", description: 'Test informations', small_cover_url: '/img/bones_small.jpg', large_cover_url: '/img/bones_large.jpg', category_id: 1)
      video.save
      Video.first.title.should == "Bones_test"
      Video.first.description.should == 'Test informations'
      Video.first.small_cover_url.should == '/img/bones_small.jpg'
      Video.first.large_cover_url.should == '/img/bones_large.jpg'
      Video.first.category_id.should ==  1
    end

    it "belongs to category" do
      video = Video.create(title: "Bones_test", description: 'Test informations', small_cover_url: '/img/bones_small.jpg', large_cover_url: '/img/bones_large.jpg', category_id: 1)
      category = Category.create(name: "Movie")
      expect(Video.first.category).to eq(category)
    end

    it "is invalid without a title" do
      expect(Video.new(title: nil)).to have(1).errors_on(:title)    
    end

    it "is invalid without a description" do
      expect(Video.new(description: nil)).to have(1).errors_on(:description)    
    end

    it "is invalid if has a same title" do
      Video.create(title: "Bones", description: "Great movie!")
      expect(Video.create(title: "Bones", description: "Fun movie!")).to have(1).errors_on(:title)  
    end

can be re-writed as:

    it { should belong_to(:category)}
    it { should validate_presence_of(:title)}
    it { should validate_presence_of(:description)}
    it { should validate_uniqueness_of(:title)}

Awesome!!!