All PCBs undergo a 100% AOI (Automated Optical Inspection) to make sure that all tracks and pads are connected. 
In addition to this, the PCBs can be tested by a flying probe to make sure that all vias are connected, because this is not visible by the AOI. Single layer PCBs do not require this test because there are no vias but boards with 2 layers and above will always be 100% tested with a flying probe.

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