The more commonly used switches on FTA are
diseqc and
22khz.
They operate on different principlds.
The DishNetwork SW21 is in a third category.
I don't know of a 100% reliable way to test any of them, other than passing signals and power through them.
Each would require a recever be set up for the particular switch (and I don't know if any Glorystar receiver can operate the SW21).
The general rule of thumb for FTA switches, is to not connect or disconnect them when the receiver is powered on.
I found all the DishNetwork switches handled such situations with 100% reliability.

Some FTA switches will; some may not.
For more info on these and multiswitches, and how to apply them, you might give a read of the Switches Simplified thread in the FAQ department.