My favorite rspec snippets

rspec_snippets.rb

# Sanity tests for factories and persistence in db
# Makes sure you have not inadvertently hosed validation, and suchlike when models are changed
shared_examples_for 'a model' do |factory, factory_params = {}|
  let(:model) { FactoryGirl.build(factory, factory_params) }

  it 'can be persisted' do
    expect(model).to be_valid
    model.save!
    expect(model).to be_persisted
  end

  context 'row can be found' do
    before do
      model.save unless model.persisted?
    end
    subject{described_class.first}  # described_class will be valid when this module is included.
    it {
      should be_a described_class
    }
  end

end

  # Controller shared example!
  shared_examples_for 'an action where login is required' do |verb,action|
    subject {
       # self is controller.  may need to set type: :controller inside main RSpec block
      self.send(verb, action) 
      response
    }

    it { should be_redirect }
    it { should redirect_to '/users/sign_in' }
  end
  
# Example of how you can DRY up your specs when you do a bunch of the same test, 
# where you don't want or need to make shared examples:
        context 'any other state' do
          subject { get :show, format: :json }
          let(:myobject) { FactoryGirl.create(:myobject, :sometrait) }
          ['some_error','some_other_error'].each do |state|
            before do
              myobject.update_attributes(approval_state: state)
            end

            it { should be_success }
            
             # You can interpolate within a test example title
            it "displays error template (#{state})" do 
              subject
              results = JSON.parse response.body
              expect(results['display_template']).to eql 'error'
            end
          end
        end
  
# RR mocks and stubs
# If you need to do a mock/stub chain, "anything" must be provided for each parameter required.
    any_instance_of(MyPostingRequestClass) do |klass|
      mock(klass).post_request(anything,anything,anything,anything) { response }
    end