help wanted: integration test fails due to controller-runtime issue

[Gekko0114]

We are facing an issue with controller-runtime while creating integration-tests for scheduler-plugin. We would appreciate your comments on this.

In this PR, we have created integration test using mgr.Start(ctrl.SetupSignalHandler()). However, as another test also uses mgr.Start(ctrl.SetupSignalHandler()), we are encountering a panic error.

panic: close of closed channel
goroutine 9857 [running]:
sigs.k8s.io/controller-runtime/pkg/manager/signals.SetupSignalHandler()
/home/prow/go/src/sigs.k8s.io/scheduler-plugins/vendor/sigs.k8s.io/controller-runtime/pkg/manager/signals/signal.go:31 +0x25
sigs.k8s.io/scheduler-plugins/test/integration.TestPodGroupController.func1()
/home/prow/go/src/sigs.k8s.io/scheduler-plugins/test/integration/podgroup_controller_test.go:78 +0x32
created by sigs.k8s.io/scheduler-plugins/test/integration.TestPodGroupController
/home/prow/go/src/sigs.k8s.io/scheduler-plugins/test/integration/podgroup_controller_test.go:77 +0x3dd
FAIL sigs.k8s.io/scheduler-plugins/test/integration 356.228s

I think this is because ctrl.SetupSignalHandler is being executed twice in a single go test.
Could you suggest how we can implement integration test in such cases?

[Gekko0114]

I've fixed my PR's issue, but I would appreciate any comments.