Add test suites

[Javen-W]

• Add a tests.py module with a suite of functions / unit tests to validate the implementation of our ASOI algorithm.
• Reference the original research paper and see if we can generate comparative results to the author's experiments on various standard datasets. ASOI scores, R2, Spear correlation, etc.
• Be mindful of the data preparation steps the authors took in their experiments. You don't need to implement every dataset but at least a few important ones.