Add code coverage check pipeline

[lowang-bh]

What would you like to be added:

Please add a github pipeline to check code coverage.

Why is this needed:

Make sure a commit has necessary UTs and UTs are effective to cover its relative changes。

[lowang-bh]

/assign @william-wang @Monokaix

[Monokaix]

It's a good idea, but this may increase the threshold for contributors to submit PR.

[lowang-bh]

It's a good idea, but this may increase the threshold for contributors to submit PR.

Write relative UTs is the basic skill for a developer. And sometimes new PR will break old fixes without UTs.

[VasuDevrani]

@lowang-bh It seems no one working on this, can I take this up?

[lowang-bh]

@lowang-bh It seems no one working on this, can I take this up?

Of couse. You are welcome.

/assign @VasuDevrani

[VasuDevrani]

so i was working on this and for the step to run test

- name: Run tests and generate coverage report
        run: |
          make unit-test
          go test ./... -coverprofile=coverage.out
          go tool cover -func=coverage.out > coverage.txt

the ci is failing with some kind of Kubeconfig error [here]:

E0516 02:53:19.986663   39759 utils.go:43] init kubeclient in 4pdvgpu failed: stat /home/runner/.kube/config: no such file or directory
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x16d78bd]

goroutine 1 [running]:
volcano.sh/apis/pkg/client/clientset/versioned.NewForConfig(0x0?)
	/home/runner/go/pkg/mod/volcano.sh/apis@v1.9.0/pkg/client/clientset/versioned/clientset.go:92 +0x1d
volcano.sh/apis/pkg/client/clientset/versioned.NewForConfigOrDie(...)
	/home/runner/go/pkg/mod/volcano.sh/apis@v1.9.0/pkg/client/clientset/versioned/clientset.go:153
volcano.sh/volcano/test/e2e/jobp.TestMain(0x1c51e00?)
	/home/runner/work/volcano/volcano/test/e2e/jobp/main_test.go:35 +0x67
main.main()
	_testmain.go:83 +0x1e6
FAIL	volcano.sh/volcano/test/e2e/jobp	0.023s
E0516 02:53:19.986155   39760 utils.go:43] init kubeclient in 4pdvgpu failed: stat /home/runner/.kube/config: no such file or directory
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x1643a3d]

this does not happen when tests are run locally, do i need to add some config secret/file? what do you think?

[lowang-bh]

I think we can intall Codecov Report App as karmada do in pr karmada-io/karmada#4950.

@Monokaix @william-wang

To install the app: https://github.com/apps/codecov/installations/select_target

[lowang-bh]

this does not happen when tests are run locally, do i need to add some config secret/file? what do you think?

I think this is a issue. We'd better not to use a kubeconfig file.