How to test a function with input call?

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As The Compiler suggested, pytest has a new monkeypatch fixture for this. A monkeypatch object can alter an attribute in a class or a value in a dictionary, and then restore its original value at the end of the test.

In this case, the built-in input function is a value of python’s __builtins__ dictionary, so we can alter it like so:

def test_something_that_involves_user_input(monkeypatch):

    # monkeypatch the "input" function, so that it returns "Mark".
    # This simulates the user entering "Mark" in the terminal:
    monkeypatch.setattr('builtins.input', lambda _: "Mark")

    # go about using input() like you normally would:
    i = input("What is your name?")
    assert i == "Mark"

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