Create Unit Tests

[Smuzzy-waiii]

The Unit Tests that are currently in lib_test.go are kinda random, a bit all over the place and do not cover testing every corner case of every publicly exposed function (ie in testing parlance, we do not have 100% test coverage)

• Your task is to create a Unit Test to test every publicly exposed function
• The Unit Test must cover every corner case (passing in edges that don't exist, boundary values etc)
• Create a new issue for the Unit Test you want to create if it does not already exists. As in, Check that the issue isn't a duplicate before creating!
• No one shall be asssigned to this issue (Create Unit Tests #4)

[Smuzzy-waiii]

Each Unit Test will be awarded atleast 250 bounty points. If the unit test is unusually large like to test a BFS fn etc, extra bounty can be awarded. The exact points will be assigned by me after the concrete issue for the Unit Test is created