How can i write test case on a pen?

pls send the answer for this.How can i write test case on a pen?
I am not really sure what you are asking, do you have more info?How can i write test case on a pen?
a. Take all the functions and characteristics of a pen


b. Write scenarios around them For e.g.


Are there any visible defects?


Does it open correctly when cap is pulled?


Try writing , does it write as intended i.e. tip point, color of ink


Is there any smudging of ink?


go on as you can think of scenarios...