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I would like to find out this too!
Currently, I make the testpoint as a new component and just use a pad in the PCB to make it looks like a testpoint. I wonder if this is the correct method or not! :|
Testpoints are established in the PCB editor, not the schematic. However, you can set a "net class" in the schematic for each of those nets that require a test point. You would place a schematic text label for each testpoint for documentation.
A design rule would then be set in Design>Rules>Testpoint>Testpoint Usage for the net class you designated in the schematic. A design rule check would flag the nets that don't have an exposed test point. You would then place a via or pad on the required nets, and the pad or via "testpoint" top or bottom type would be checked for those manually placed testpoints.
Testpoints are manually placed because the software cannot determine in advance what points on a given net are going to be accessible from the side of the board from which you will want to measure.
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