Add new testcases for the methods as done in the test file

[extinctsion]

please make sure to follow the standard naming conventions and process. If facing any issue, you can comment and ask/tell. Thank you

[BattiniSandeep]

Would like to work on this. Assign it to me. Thanks

[Zahid92]

Hi @extinctsion, I have made changes for Graph related tests in #51.
Could you check it and see if anything else is needed.

[extinctsion]

We have to add more methods in order to add more test cases. You can add test cases for other methods too.

[extinctsion]

You can generate test cases with the help of AI. As I have shown in this example. https://chat.openai.com/share/8d233110-b671-46bc-ab26-b7d2908d476d