describe Cell do

  let(:colors) { [azul, negro, rojo, verde] }
  let(:cell)   { Cell.new }

  it "answers that there are no balls of a given color" do
    expect(cell.are_there_balls?(azul)).to be false
    expect(cell.are_there_balls?(negro)).to be false
    expect(cell.are_there_balls?(rojo)).to be false
    expect(cell.are_there_balls?(verde)).to be false
  end

  it "answers that there are balls of a given color when adding some" do
    cell.put azul
    cell.put rojo

    expect(cell.are_there_balls?(azul)).to be true
    expect(cell.are_there_balls?(negro)).to be false
    expect(cell.are_there_balls?(rojo)).to be true
    expect(cell.are_there_balls?(verde)).to be false
  end

  it "answers the number of balls of a given color" do
    5.times { cell.put verde }

    expect(cell.number_of_balls(azul)).to eq(0)
    expect(cell.number_of_balls(negro)).to eq(0)
    expect(cell.number_of_balls(rojo)).to eq(0)
    expect(cell.number_of_balls(verde)).to eq(5)
  end

  it "allows to take out some balls" do
    5.times { cell.put azul }
    3.times { cell.take_out azul }

    expect(cell.are_there_balls?(azul)).to be true
    expect(cell.number_of_balls(azul)).to eq(2)
  end

  it "raises an error if it's not possible to take out balls" do
    expect { cell.take_out rojo }.to raise_error(EmptyCellError)
  end

  it "fails passing something that is not a color" do
    expect { cell.put("not a color") }.to raise_error
    expect { cell.take_out(42) }.to raise_error
    expect { cell.are_there_balls?(Norte) }.to raise_error
    expect { cell.number_of_balls(nil) }.to raise_error
  end

  it "clears its contents" do
    colors.each { |color| cell.put color }

    cell.empty!

    colors.each { |color| expect(cell.are_there_balls?(color)).to be false }
  end

  it "is empty if it doesn't have any balls" do
    expect(cell.empty?).to be true
  end

  it "is not empty it it has some balls" do
    colors.each { |color| cell.put color }
    expect(cell.empty?).to be false
  end

end