how to test a power supply

I have about 10 misc. power supplies. My friend told me each one should have a switch on it and just plug in the power cord and the fan should turn, if not the power supply needs to be discarded. Is this true? where are these switches? what other easy way to test them without volt meters, etc.?
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I just bought one of these as a carry around tester it works very well for 10 bucks
We have the same one that is in Dynamic1's link nickq5.  We swear by it.
>>   each one should have a switch on it and just plug in the power cord and the fan should turn    <<< NOT TRUE - ATX power supplies need to check some levels , before they actually power on !
this Was maybe true on the older types, but not anymore. You should need to connect some circuits, in order to have it power on; but a better way is the power supply tester as mentioned by Dynamic1
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>>  where are these switches  << in most cases, the power on switch is located near the power inlet, on the same plate; but some power supplies even do not have a hard power off switch
nickg5Author Commented:
the only switches I am seeing are 110v to real on/off or reset button.
On the backplane, you see :
AC input plug
110V-220V switch
power on/off switch (optional)

Look here :

the first picture shows the backplane of one without the switch, the second shows one with the switch

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