Features: 1. Ctrl+c stops tests and prints failures 2. pastable rerun snippet for failures (disabled/integrated on rails 5) 3. multiple before & after blocks 4. around blocks around { |t| Dir.chdir(...) { t.call } } 5. red-green output (disabled/integrated on rails 5) 6. mtest executable to run by line number and by folder (disabled/integrated on rails 5) 7. full backtrace for errors and assertions with verbose (-v) 8. And more!