Test Case for Pen

Unit test:
Write test case for each & every part of the pen, like Refil, Pen cap, the upper neck of the pen & the lower part of the pen etc... Against the configuration mentioned.

Integration Test:
Check integration of Ink flow in the refill, Cap with the pen , both parts of the pen & Refill fits b/w the pen or not etc...

Compatibility Test:
Try to write with the pen on different papers like wet paper , rice paper, Oily paper,

Load Test:
Turn the pen upside down & note the time till which it can write, Ink flow in different weathers etc...