Add Unit Testing each and every function in the code

[sbshah97]

• Use CPPUnit framework for Unit Testing each and every function in the code as well as write code to test functions with various different test cases as well!
• Implement all tests in a tests directory allowing each and every function to be tested with multiple inputs.
• Test cases should follow the format of passing one Unit Test and failing one Unit Test.

[Sasasu]

Hello, I would like to contribute to this.
Could I ask which build system the test will use? Can I just write Makefile by hand?
And what is the "passing one Unit Test and failing one Unit Test" format?
Is that means give one illegal input which can make an exception and then give one legal input?

[sbshah97]

@Sasasu check out CPPUnit Test for writing tests.

And what is the "passing one Unit Test and failing one Unit Test" format?
Is that means give one illegal input which can make an exception and then give one legal input?

Yes basically we need to check if all exceptions and corner cases are handled or not and the program doesn't crash when an illegal input is given!

[Sasasu]

Hello, I have finish test-graph.h to test graph.
When I am willing to start writing test-tree.h, it makes me confused. and the test minimumSpanningTree always failed.

tree.h#L50 what is the s for? and Tree::addEdge have a very high complexity, it runs hasCycle every time ...

I will send a pull request soon.

[sbshah97]

Any doubts yet? @Hrily