I really like vttest. I used to use it when I was still working on Console Telnet for Win32 (https://github.com/cout/consoletelnet https://github.com/cout/cons

I really like vttest. I used to use it when I was still working on Console Telnet for Win32 (https://github.com/cout/consoletelnet https://github.com/cout/consoletelnet). It revealed a lot of bugs in how escape sequences were handled that I might never have noticed since they were obscure (yet important) corner cases.