Add more testing #277
Description
Is your feature request related to a problem? Please describe.
Currently, there is a few tests in openpiv.test. However, there should be more tests exploring different use cases.
Describe the solution you'd like
Follow testing procedures of OpenPIV-c--qt and others and expand tests to encompass a wider variety of conditions.
Additional context
If someone has any additional ideas for additional tests, please share them.