Automated QA: Unit tests with mocked github events

[0x4007]

A lengthy goal would be to also include unit tests with mocked github events

Originally posted by @web4er in #626 (comment)

[0xcodercrane]

Kicking off this issue slowly. I will work on base architecture and examples. Anyone can get assigned and continue working on top of the progress I've made.

[0xcodercrane]

Here's a quick instruction if you wanna take over the issue on top of the latest progress I've made:

1/ Fork the feat/unit-test branch to your local repo cause I am continuously pushing new stuff.
2/ Add *.spec.ts in test folder like address.spec.ts.
3/ You can add specific files to exclude list for the coverage. In the ideal case, we shouldn't add anything to the exclude list. we can add index/schema/types files to the exclude list.
4/ Feel free to ask to @0xcodercrane or any admins if you have any questions/comments/improvements.

[ubiquibot]

Permit generation skipped since assignee is undefined

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