The spindle test is performed in order to test the functionality of the motor in the lock.
If the spindle is working as shown below, this means the motor is locking and unlocking the device properly.
If the lock is not working as expected when installed on the door, but this test is successful, it would indicate another issue with the installation... These other issues could be an alignment error, the lock being installed too tightly on the door, an issue with the latch, etc.
When door is locked, the spindle will move freely to the right and left:
When door is unlocked, spindle will not move in either direction:
Additional troubleshooting tips can be found in our Troubleshooting and Best Practices article.