Build up our test CI to protect the code

1. we don't run test in CI to check the code
2. The test is incomplete, and inappropriate, we just run e2e test to connect to the real database, downside of this is that we have to rely on outside truth, database here. So we need change to integration test + unit test to cover at lease the main part of the API

Maybe this issue is too big, could consider a project and split to smaller pieces of tasks.

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