require 'test_helper'

module Vedeu

  describe Row do

    let(:described) { Vedeu::Row }
    let(:instance)  { described.new(cells) }
    let(:cells)     { [:hydrogen, :helium, :lithium] }

    describe '#initialize' do
      it { instance.must_be_instance_of(described) }

      context 'when there are no cells' do
        let(:cells) {}

        it { instance.instance_variable_get('@cells').must_equal([]) }
      end

      context 'when there are cells' do
        it { instance.instance_variable_get('@cells').must_equal(cells) }
      end
    end

    describe '.coerce' do
      subject { described.coerce(_value) }

      context 'when the value is a Vedeu::Row' do
        let(:_value) { Vedeu::Row.new }

        it { subject.must_equal(_value) }
      end

      context 'when the value is an Array' do
        let(:_value) { [:hydrogen, :helium, :lithium] }

        it { subject.must_equal(Vedeu::Row.new(_value)) }
      end

      context 'when the value is an Array containing nil objects' do
        let(:_value) { [:hydrogen, nil, :lithium] }

        it { subject.must_equal(Vedeu::Row.new([:hydrogen, :lithium])) }
      end

      context 'when the value is nil' do
        let(:_value) {}

        it { subject.must_equal(Vedeu::Row.new) }
      end

      context 'when the value is anything else' do
        let(:_value) { :beryllium }

        it { subject.must_equal(Vedeu::Row.new([_value])) }
      end
    end

    describe '#each' do
      subject { instance.each }

      it { subject.must_be_instance_of(Enumerator) }
    end

    describe '#eql?' do
      let(:other) { instance }

      subject { instance.eql?(other) }

      it { subject.must_equal(true) }

      context 'when different to other' do
        let(:other) { described.new([:hydrogen]) }

        it { subject.must_equal(false) }
      end
    end

    describe '#cell' do
      let(:index) {}

      subject { instance.cell(index) }

      context 'when the index is nil' do
        it { subject.must_equal(nil) }
      end

      context 'when the index is not nil' do
        context 'and the index is in range' do
          let(:index) { 1 }

          it { subject.must_equal(:helium) }
        end

        context 'and the index is out of range' do
          let(:index) { 4 }

          it { subject.must_equal(nil) }
        end

        context 'and the index is out of range' do
          let(:index) { -4 }

          it { subject.must_equal(nil) }
        end
      end
    end

  end # Row

end # Vedeu