Unit testing prompt-toolkit timeouts on Windows

[ancalita]

• The issue is that the separator "\n" that the prompt_toolkit docs recommends for Unix-based OS does not work on Windows - the test timeouts waiting for input.
• I originally replaced the "\n" with os.linesep but that didn't help, the tests were still timing out.
• I also tried implementing custom key bindings using prompt_toolkit that would work in both Linux and Windows systems: this didn't work either, tests still time out on Windows.

Note that the tests pass without issues on Linux and Mac OS.