Decide unit testing framework to be used #2
Description
Currently, testing of DSA implementation in this repository uses a simple demo.cpp files and requires manual observation from the tester to ensure that a implementation of certain DSA behaves the way that the programmer intended. While this is manageable for small classes, it becomes exponentially hard to keep track of various test cases manually. To counter this, a unit test will be written so that manual check of code output is no longer required.
However, the unit testing framework itself hasn't been decided. The unit test framework that will be used in this repository must be lightweight and easy to setup so that it will not over-complicate this repository. After a unit test framework is decided, each test must be written in a directory separate from source directory.