describe QA::Page::View do
  let(:element) do
    double('element', name: :something, pattern: /some element/)
  end

  subject { described_class.new('some/file.html', [element]) }

  describe '.evaluate' do
    it 'evaluates a block and returns a DSL object' do
      results = described_class.evaluate do
        element :something, 'my pattern'
        element :something_else, /another pattern/
      end

      expect(results.elements.size).to eq 2
    end
  end

  describe '#pathname' do
    it 'returns an absolute and clean path to the view' do
      expect(subject.pathname.to_s).not_to include 'qa/page/'
      expect(subject.pathname.to_s).to include 'some/file.html'
    end
  end

  describe '#errors' do
    context 'when view partial is present' do
      before do
        allow(subject.pathname).to receive(:readable?)
          .and_return(true)
      end

      context 'when pattern is found' do
        before do
          allow(File).to receive(:foreach)
            .and_yield('some element').once
          allow(element).to receive(:matches?)
            .with('some element').and_return(true)
        end

        it 'walks through the view and asserts on elements existence' do
          expect(subject.errors).to be_empty
        end
      end

      context 'when pattern has not been found' do
        before do
          allow(File).to receive(:foreach)
            .and_yield('some element').once
          allow(element).to receive(:matches?)
            .with('some element').and_return(false)
        end

        it 'returns an array of errors related to missing elements' do
          expect(subject.errors).not_to be_empty
          expect(subject.errors.first)
            .to match %r(Missing element `.*` in `.*/some/file.html` view)
        end
      end
    end

    context 'when view partial has not been found' do
      it 'returns an error when it is not able to find the partial' do
        expect(subject.errors).to be_one
        expect(subject.errors.first)
          .to match %r(Missing view partial `.*/some/file.html`!)
      end
    end
  end
end
