require 'rails_helper'

describe Cell do

  let(:cell) { described_class.new('a', brush) }
  let(:brush) { double('brush') }

  describe '#empty?' do
    let(:cell) { described_class.new(text, brush) }

    subject { cell.empty? }

    context "when text is not blank" do
      let(:text) { 'a' }
      let(:brush) { double('brush', :default? => true) }

      it { should be(false) }
    end

    context "when brush is not default" do
      let(:text) { ' ' }
      let(:brush) { double('brush', :default? => false) }

      it { should be(false) }
    end

    context "when text is blank and brush is default" do
      let(:text) { ' ' }
      let(:brush) { double('brush', :default? => true) }

      it { should be(true) }
    end
  end

  describe '#==' do
    let(:other) { described_class.new(text, other_brush) }

    subject { cell == other }

    context "when text differs" do
      let(:text) { 'b' }
      let(:other_brush) { double('brush', :== => true) }

      it { should be(false) }
    end

    context "when brush differs" do
      let(:text) { 'a' }
      let(:other_brush) { double('brush', :== => false) }

      it { should be(false) }
    end

    context "when text and brush are equal" do
      let(:text) { 'a' }
      let(:other_brush) { double('brush', :== => true) }

      it { should be(true) }
    end
  end

  describe '#[]' do
    let(:cell) { described_class.new('abcdef', brush) }

    subject { cell[2..4] }

    it 'returns new cell with the cropped text and the same brush' do
      expect(subject).to eq(Cell.new('cde', brush))
    end
  end

  describe '#as_json' do
    subject { cell.as_json }

    before do
      allow(brush).to receive(:as_json) { { fg: 1, bold: true } }
    end

    it { should eq(['a', { fg: 1, bold: true }]) }
  end

end