When in doubt, go for the simplest input

Picking concrete input for test cases is tricky. You want to choose a value that is realistic but, at the same time, simple enough to facilitate debugging if the test fails.

I recommend that you avoid choosing complex inputs unless you have a good reason to use them. Do not pick a large integer value if you can choose a small integer value. Do not pick a 100-character string if you can select a 5-character string. Simplicity matters.