How to write test case for pen?

i have to write test case for pen please give and send format for test caseHow to write test case for pen?
You can a write a test case for a pen





1. Check if pen is made of marked brand


2. Check if nib is proper


3. Check if the knot of the ink container is proper


4. Check with ink filled whether it is writing properly


5. Check with teh closure pen cap


6. Finally check its cost





Bye