clitest binary package in Ubuntu Bionic amd64

 Clitest is a portable POSIX shell script that performs automatic
 testing in Unix command lines. This script was carefully coded to
 be portable between POSIX shells.
 .
 It's the same concept as in Python's doctest module: you document
 both the commands and their expected output, using the familiar
 interactive prompt format, and a specialized tool tests them.
 .
 The clitest command searches for pieces of text that look like
 interactive Unix command lines, and then executes those command
 lines to verify that they work exactly as shown.

Source package