require 'rails_helper' require 'cache' describe Gaps do it 'returns no gaps for empty data' do expect(Gaps.new(nil, nil)).to be_blank end it 'returns no gaps with one element' do expect(Gaps.new([1], [1])).to be_blank end it 'returns no gaps when all elements are present' do expect(Gaps.new([1, 2, 3], [1, 2, 3])).to be_blank end context "single element gap" do let(:gap) { Gaps.new([1, 3], [1, 2, 3]) } it 'has a gap for post 3' do expect(gap).not_to be_blank expect(gap.before[3]).to eq([2]) expect(gap.after).to be_blank end end context "larger gap" do let(:gap) { Gaps.new([1, 2, 3, 6, 7], [1, 2, 3, 4, 5, 6, 7]) } it 'has a gap for post 6' do expect(gap).not_to be_blank expect(gap.before[6]).to eq([4, 5]) expect(gap.after).to be_blank end end context "multiple gaps" do let(:gap) { Gaps.new([1, 5, 6, 7, 10], [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) } it 'has both gaps' do expect(gap).not_to be_blank expect(gap.before[5]).to eq([2, 3, 4]) expect(gap.before[10]).to eq([8, 9]) expect(gap.after).to be_blank end end context "a gap in the beginning" do let(:gap) { Gaps.new([2, 3, 4], [1, 2, 3, 4]) } it 'has the gap' do expect(gap).not_to be_blank expect(gap.before[2]).to eq([1]) expect(gap.after).to be_blank end end context "a gap in the ending" do let(:gap) { Gaps.new([1, 2, 3], [1, 2, 3, 4]) } it 'has the gap' do expect(gap).not_to be_blank expect(gap.before).to be_blank expect(gap.after[3]).to eq([4]) end end context "a large gap in the ending" do let(:gap) { Gaps.new([1, 2, 3], [1, 2, 3, 4, 5, 6]) } it 'has the gap' do expect(gap).not_to be_blank expect(gap.before).to be_blank expect(gap.after[3]).to eq([4, 5, 6]) end end end