test: rewrite unit tests with all possible edge cases

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Properly test functions by going through all possible edge cases

Creating the test suite

For functions with complex use cases, create an object with the test parameters.
This will require refactoring and creating helper functions to iterate the test suites.

Below is a run down of the possible stages:

• Create objects with test parameters, complex utilities should be tested in isolation.
• Test each module in isolation
• 100% test coverage for all exported symbols

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