How often should you do the ramp test?
Typical suggestion is every 4-6 weeks, or if you suspect a notable change (up or down) in your fitness.
Most training plans have some FTP test in place on the range above.
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Do it when scheduled. The plans have a progression built in and testing mid block will put you in a difficult spot with the harder workouts.
Exceptions: several failed workouts or it always feels too easy.