Unit Tests Coverage - First Batch

[samyakkkk]

First batch of unit tests added for:

• data_structures/binary_tree
• data_structures/Heap/Binary_Heap
  Result: +74 -13

Requesting the team to review :) once approved I'll create subsequent PRs for full test coverage of the codebase.

Describe your change:

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Documentation change?
• Add/Update/Fix test cases.

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Dart files are placed inside an existing directory.
• All new algorithms have a URL in its comments that points to Wikipedia or other similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[akashgk]

hi @samyakkkk Nice work on the Welltestted. But Should we be moving ahead with Ai tested code?
I think since its a repo for learning, wouldnt it be great if we could add some code on our own. Besides there are tons of generated tests, which would make it much harder to learn. I think this is a great product. but would love to see test cases in files with proper formatting, coding practices etc. This PR looks far too big as well.

[samyakkkk]

Hi @akashgk thanks for the feedback I can try to create a smaller PR for each file one by one.

Can you please also share what are the specific coding practices we're looking for? Because I think the current code already is following it. :) Look forward to your response. cheers!