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