Use unittest instead of pytest everywhere

[jerryzh168]

fbcode is deprecating pytest support so we want to use unittest everywhere to make sure the features are tested in both OSS and fbcode

[osbm]

Hello @jerryzh168,

I am seeing the usage of both unittest and pytest in the tests now. Is the pytest still the preferred testing library?

If so maybe i can open a PR to migrate all the currently pytest tests. Currently this library uses both these tests.

[jerryzh168]

@osbm unittest will be preferred since pytest is deprecated in fbcode. yeah feel free to open a PR to migrate the pytest tests to use unittest, you can also start with just migrating one file before applying the changes to more files I think.

[jcaip]

cc @drisspg any thoughts here?

[drisspg]

not particularly, I dont think pytest has broken that much internally since we have relatively vanilla usage, if someone did a full swap sure seems like BE project for a motivated individual