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Not sure how to test this effectively without testing the implementation details.

Maybe creating a simple input element, adding this in the onChange listener, and leveraging React Testing library and the user-event package? to make sure that the return value is correct?

Not sure how to test this effectively without testing the implementation details.

Maybe creating a simple input element, adding this in the onChange listener, and leveraging React Testing library and the user-event package? to make sure that the return value is correct?

Nevermind, I just realised that this is an issue with IE / Edge. Yeah I guess that the only way would be a few small unit tests:

• one creating a mock event object in the way that IE / Edge would, and checking that the output is normalised
• another one creating a mock event object like other browsers would, and making sure that the output stays the same (ie it didn't need normalisation)
• a last one creating an event object that is not related to arrow keys — and making sure that the output is the same as the input

Added tests, ready for review!