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How would I test this controller action with Rspec

How should I spec this

class FlagsController
  def like
    flag = current_user.flags.find_or_initialize_by_flaggable_type_and_flaggable_id(params[:like_type], params[:like_id])
    flag.kind = params[:kind]

    if flag.save
      head :ok
    else
      head :unprocessable_entity
    end
  end
end

My current spec

describe FlagsController do
    before (:each) do
      @user = Factory(:user)
      sign_in @user
    end

    describe "flag" do
      it 'with valid params' do
        controller.stub!(:current_user).and_return(@user)
        @user.stub_chain(:flags, :find_or_initialize_by_flaggable_type_and_flaggable_id).
          with('Comment', '1').
          and_return(mock_flag(:save => false)).
          stub!(:kind).
          with('up').
          and_return(mock_flag(:save => true))
        post :like, :like_type => 'Comment', :like_id => '1', :kind => 'up'
        response.response_code.should eq(200)
      end
    end

Spec results

Failure/Error: response.response_code.should eq(200)

   expected 200
       开发者_Python百科 got 422

   (compared using ==)

Route

post 'like' => 'flags#like'


How I would write this test:

describe FlagsController do
  before (:each) do
    @user = Factory(:user)
    sign_in @user
  end

  describe "post :like" do
    before(:each) do
      controller.stub!(:current_user).and_return(@user)
      @mock_flag = mock(Flag)
      @mock_flag.should_receive(:kind=).with('up')
      @user.stub_chain(:flags, :find_or_initialize_by_flaggable_type_and_flaggable_id).
            with('Comment', '1').and_return(@mock_flag)
    end
    context 'when save fails' do
      before(:each) do
        @mock_flag.should_receive(:save).and_return(false)
        post :like, :like_type => 'Comment', :like_id => '1', :kind => 'up'
      end

      it { response.should be_unprocessable_entity }
    end
    context 'when save succeeds' do
      before(:each) do
        @mock_flag.should_receive(:save).and_return(true)
        post :like, :like_type => 'Comment', :like_id => '1', :kind => 'up'
      end

      it { response.status.should be == 200 }
    end
  end

Hope this helps.

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