Complete test suite

[EmanuelUnity3D]

Currently, we lack testing for certain types of inputs (large inputs, small inputs, edge cases, etc.). Moreover, we have very little testing for exceptions and no testing at all for the parser.

We should add to our test suite so that a larger variety of tests are covered. Also, we should change the format of our tests so that they make use of the parser. Similarly, we should add tests to test Parser edge cases themselves.

Lastly, we should clean up the testing functions, add documentation, and bring them up to PEP-8 standard. This should conclude the unit-testing part of our project.