require 'rails_helper' require 'content_buffer' describe ContentBuffer do it "handles deletion across lines properly" do c = ContentBuffer.new("a\nbc\nc") c.apply_transform!(start: {row: 0, col: 0}, finish: {col: 1, row: 1}, operation: :delete) expect(c.to_s).to eq("c\nc") end it "handles deletion inside lines properly" do c = ContentBuffer.new("hello world") c.apply_transform!(start: {row: 0, col: 1}, finish: {col: 4, row: 0}, operation: :delete) expect(c.to_s).to eq("ho world") end it "handles inserts inside lines properly" do c = ContentBuffer.new("hello!") c.apply_transform!(start: {row: 0, col: 5}, operation: :insert, text: " world") expect(c.to_s).to eq("hello world!") end it "handles multiline inserts" do c = ContentBuffer.new("hello!") c.apply_transform!(start: {row: 0, col: 5}, operation: :insert, text: "\nworld") expect(c.to_s).to eq("hello\nworld!") end end