[test] add Btree test and bug fix

[JIACHENG135]

No description provided.

[JIACHENG135]

Add this to pass test_huge_insert

[JIACHENG135]

test_huge_insert_and_delete is still failing. Can you help have a look?

[JIACHENG135]

pytest --log-cli-level=DEBUG ./trees/b_tree_test.py to trigger the test

[msambol]

Will take a look in the morning 👍🏼

[JIACHENG135]

Fixed the bugs and passed all the tests.

[msambol]

@JIACHENG135 Hey! I appreciate you digging in. This is a fairly big shift in logic and introduces recursion. I'd like to keep the code as close as possible to the videos. Is there a bug you found that can be fixed with less logic change?

[JIACHENG135]

Hey, this is not a huge change since before bug fix the recursive function is already there(which is align with your great video content). I just added the return value for delete_predecessor and delete_successorsince delete_internal_node does need that right?

[JIACHENG135]

https://github.com/JIACHENG135/Btree

[msambol]

https://github.com/JIACHENG135/Btree

This looks great!