1. first check whether switch is connected to corresponding 
circuit at one end and another end should be connected to 
the (fan)any eletric device.
2. check the size,color and position of the switch 
according to the requirement.
3. check whether switches are able to on and off.
4.check, if the switch is on the fan should work, if the 
switch is off fan should not work.

Am I rigth?

Precondition:
two switch should have wire connection and alsoget 
connected with light.
Test case:
1.Have two switch
2.Switch on S1....result light should glow and switch s2 
should be in off.
3.switch on s2...result light should be off...and switch s1 
should off..