Simulating keystrokes to external program

Hi! I have a package that makes a heavy use of fzf.
I would like to test things more thoroughly but this requires interactive actions on fzf itself.

I am aware of GitHub - Keno/VT100.jl: Terminal Emulation for terminal UI verification but to be honest, the lack of documentation and the age of the package makes me doubt it is relevant.

Is there anything else I could use?

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