Zoom does currently offer simple speaker and microphone tests.
The speaker test plays a short tune so the user can adjust their volume.
The microphone test allows the user to record a short piece of speech which is played back after a short pause so that the user can check the level and quality.

Please add a feature to allow a user to test their audio by recording their voice using their microphone and then playing it back through their sound output device.
This test feature would allow the user to confirm their voice is clearly audible and not distorted.
Although the current test feature shows the sound bar moves when the user is speaking, this only proves that a sound is being detected but it could be distorted or have other impairments that would make the speech unintelligible.