chore(test): Add unit test and integration test

[gaocegege]

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Description

We need set up the test process and add more unit/integration test cases. There are many interfaces in the code, thus it should be easy to mock them and test the main logic.

Acceptance Criteria

• [ ] test for IR and frontend
• [x] test for cache
• [ ] test for docker client

[gaocegege]

https://github.com/golang/mock can be used to generate the interface mock implementation for test purposes.

[Thrimbda]

What test library do we prefer? For simple unit test, the original test lib is enough; Yet what about e2e test, ginkgo+go mega or goconvey?

Do you have some recommendations? And what's more, can any of these libs achieve incremental testing for ci(cachable)?

[gaocegege]

We are using ginkgo+go mega in #83 Personally, perfer BDD test cases in unit test and integration test.

what's more, can any of these libs achieve incremental testing for ci(cachable)?

I do not know about it. Do you know that?

[Thrimbda]

I always have some difficult of writing tests, thus I would like give it a shot.

[gaocegege]

Acceptance Criteria

• [ ] test for IR and frontend
• [x] test for cache
• [ ] test for docker client

[gaocegege]

up e2e test

[gaocegege]

dibs

/assign

[VoVAllen]

Closed in #804

[VoVAllen]