User Interface:Color and size should be user friendly. how easily can you hold it in hands.Is it compatible with your fingers? Functionality:Preconditions:Staples should fit in stapler. Verify that it can staple perfectly? Verify that the spring is pushing the staples freely as desired? Verify that the last pin can staple without any problem? Performance:Preconditions:Staples should fit in stapler. Verify that the stapler can staple a bunch of papers(ranging from 5-10)? Verify that the stapler can staple card boards? Negative testing: Try to insert staples which are in larger size?
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max no of pins a stapler can load at a time size of the pins required check whether the spring runs properly and test cases based on the req specified by the customer
Load Test: Try to test the stapler by trying to staple a bunch of paper with more number of pages than it can handle. Or try to staple a card board or a tough paper like that...
Stress Test: Not sure.....Trying to staple the papers with pins of less size in it.