Racing the engine from the throttle linkage is fine: Yes, it opens/closes the throttle valve.
If ABV test is failing, there's probably schmutz somewhere in the ACV keeping the ABV or ASV plungers open or closed or clogging.
Once you get the assembly apart, it will be apparent.
Also, it's possible but not common, that the diaphragm of the ABV or ASV has failed. Once the assembly is apart, just apply vacuum to the diaphragms to see if they hold the plungers up.
If ABV test is failing, there's probably schmutz somewhere in the ACV keeping the ABV or ASV plungers open or closed or clogging.
Once you get the assembly apart, it will be apparent.
Also, it's possible but not common, that the diaphragm of the ABV or ASV has failed. Once the assembly is apart, just apply vacuum to the diaphragms to see if they hold the plungers up.