ruby on rails - how to use the context in the tests? -

please write tests context.

model album:

class album < activerecord::base   validates :title, presence: true, length: { maximum:  50, minimum: 3 }, uniqueness: { case_sensitive: false }   validates :description, presence: true, length: { maximum:  600, minimum: 10 } end 

i wrote tests model album:

describe album   "has valid factory"     expect(factorygirl.create(:album)).to be_valid   end    "is invalid without title"     expect(factorygirl.build(:album, title: nil)).not_to be_valid   end      "is invalid duplicate title"     factorygirl.create(:album, title: 'qwerty')     expect(factorygirl.build(:album, title: 'qwerty')).not_to be_valid   end     "is valid different title"     factorygirl.create(:album, title: 'zxcvbn')     expect(factorygirl.build(:album, title: 'asdfgh')).to be_valid   end         end 

these tests worked ok. need use context:

describe album   "has valid factory"     expect(factorygirl.create(:album)).to be_valid   end    describe '#title'     context "invalid"       "is invalid without title"         expect(factorygirl.build(:album, title: nil)).not_to be_valid       end          "is invalid long title"         expect(factorygirl.build(:album, title: 'if liked series on practical advice adding reliable tests rails apps, check out expanded ebook version. lots of additional, exclusive content , complete sample rails application.')).not_to be_valid       end                "is invalid duplicate title"         factorygirl.create(:album, title: 'qwerty')         expect(factorygirl.build(:album, title: 'qwerty')).not_to be_valid       end            end      context "valid"       "is valid title"         expect(factorygirl.build(:album, title: 'good title')).not_to be_valid       end          "is valid different title"         factorygirl.create(:album, title: 'zxcvbn')         expect(factorygirl.build(:album, title: 'asdfgh')).to be_valid       end       end   end       end 

but these tests not dry. please write test context again.

ps: practices tried use:

1. checking limiting cases (a small value, great value, average value)
2. use contexts organization code
3. each test should in separate method

your tests using context looks okay. but, can write better tests using context following best practices. see better specs guidelines see how write better rspec tests.

also, see following classic example of using context the rspec style guide

# classic example use of contexts in controller spec creation or update when object saves or not.  describe articlescontroller   let(:article) { mock_model(article) }    describe 'post create'     before { article.stub(:new).and_return(article) }      'creates new article given attributes'       article.should_receive(:new).with(title: 'the new article title').and_return(article)       post :create, article: { title: 'the new article title' }     end      'saves article'       article.should_receive(:save)       post :create     end      context 'when article saves successfully'       before { article.stub(:save).and_return(true) }        'sets flash[:notice] message'         post :create         flash[:notice].should eq('the article saved successfully.')       end        'redirects articles index'         post :create         response.should redirect_to(action: 'index')       end     end      context 'when article fails save'       before { article.stub(:save).and_return(false) }        'assigns @article'         post :create         assigns[:article].should be_eql(article)       end        're-renders "new" template'         post :create         response.should render_template('new')       end     end   end end