require "coverage" ENV["COVERAGE_EXPERIMENTAL_MODE"] = "true" Coverage.start(lines: true, branches: true, methods: true) TEST_COVERAGE_DATA_FILE = "test-coverage.dat" def merge_coverage_data(res1, res2) res1.each do |path, cov1| cov2 = res2[path] if cov2 cov1[:lines].each_with_index do |count1, i| next unless count1 add_count(cov2[:lines], i, count1) end cov1[:branches].each do |base_key, targets1| if cov2[:branches][base_key] targets1.each do |target_key, count1| add_count(cov2[:branches][base_key], target_key, count1) end else cov2[:branches][base_key] = targets1 end end cov1[:methods].each do |key, count1| add_count(cov2[:methods], key, count1) end else res2[path] = cov1 end end res2 end def add_count(h, key, count) if h[key] h[key] += count else h[key] = count end end def save_coverage_data(res1) File.open(TEST_COVERAGE_DATA_FILE, File::RDWR | File::CREAT | File::BINARY) do |f| f.flock(File::LOCK_EX) s = f.read res2 = s.size > 0 ? Marshal.load(s) : {} res1 = merge_coverage_data(res1, res2) f.rewind f << Marshal.dump(res2) f.flush f.truncate(f.pos) end end def invoke_simplecov_formatter %w[doclie simplecov-html simplecov].each do |f| $LOAD_PATH.unshift "#{__dir__}/../coverage/#{f}/lib" end require "simplecov" res = Marshal.load(File.binread(TEST_COVERAGE_DATA_FILE)) simplecov_result = {} base_dir = File.dirname(__dir__) res.each do |path, cov| next unless path.start_with?(base_dir) next if path.start_with?(File.join(base_dir, "test")) simplecov_result[path] = cov[:lines] end res = SimpleCov::Result.new(simplecov_result) res.command_name = "Ruby's `make test-all`" SimpleCov::Formatter::HTMLFormatter.new.format(res) end pid = $$ pwd = Dir.pwd at_exit do exit_exc = $! Dir.chdir(pwd) do save_coverage_data(Coverage.result) if pid == $$ begin nil while Process.waitpid(-1) rescue Errno::ECHILD invoke_simplecov_formatter end end end raise exit_exc if exit_exc end