require 'rails_helper' require_dependency 'timeline_lookup' describe TimelineLookup do it "returns an empty array for empty input" do expect(TimelineLookup.build([])).to eq([]) end it "returns the lookup for a series of posts" do result = TimelineLookup.build([[111, 1, 10], [222, 2, 9], [333, 3, 8]]) expect(result).to eq([[1, 10], [2, 9], [3, 8]]) end it "omits duplicate dates" do result = TimelineLookup.build([[111, 1, 10], [222, 2, 10], [333, 3, 8]]) expect(result).to eq([[1, 10], [3, 8]]) end it "respects holes in the post numbers" do result = TimelineLookup.build([[111, 1, 10], [222, 12, 10], [333, 30, 8]]) expect(result).to eq([[1, 10], [3, 8]]) end it "respects a `max_values` setting" do input = (1..100).map { |i| [1000 + i, i, 100 - i] } result = TimelineLookup.build(input, 5) expect(result.size).to eq(5) expect(result).to eq([[1, 99], [21, 79], [41, 59], [61, 39], [81, 19]]) end it "respects an uneven `max_values` setting" do input = (1..100).map { |i| [1000 + i, i, 100 - i] } result = TimelineLookup.build(input, 3) expect(result.size).to eq(3) expect(result).to eq([[1, 99], [35, 65], [69, 31]]) end end