Add Unit Test for crop.py

[OrangePear13]

Add Unit Test for crop.py

Problem

Create unit tests for vision/common/crop.py

Solution

Unit tests that will execute every line of code in the file (excluding main block code, unless file is intended to be ran directly).

Additional Information

A Unit test is code that will verify that a small, indivisible block of code executes as expected and generates the desired output when given input as specified.