Cleanup cluster resources when test fails

[dibyom]

Fixes #495

Signed-off-by: Dibyo Mukherjee dibyo@google.com

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Release Notes

[ncskier]

I tested this out (using Docker for Desktop) and it didn't seem to clean up the cluster-wide resources when I interrupted the test with Ctrl+C or when I added a t.Fatal()to make the test fail 😕I'm not sure why though... did it work for you when you tested this @dibyom ?

Also, looks like the build test is failing because of gosimple:

I0326 02:58:02.072] pkg/apis/triggers/v1alpha1/event_listener_validation.go:65:31: S1039: unnecessary use of fmt.Sprintf (gosimple)
I0326 02:58:02.072] return apis.ErrMissingField(fmt.Sprintf("template.name"))

[ncskier]

Hm, I just tested again, and the cleanup worked when I put a t.Fatal() in the test. However, the cleanup still doesn't seem to work when I interrupt the test with Ctrl+C.

[dibyom]

The cleanup should work Ctrl + C as well due to
knativetest.CleanupOnInterrupt(func() { cleanup(t, c, namespace) }, t.Logf)

Just tried this out on my local environment (linux machines, cluster is GKE) and the test cleaned up fine
`

[ncskier]

Ok. Yeah, not sure why the Ctrl+C isn't working for me, but at least it cleans up when the test fails. So, this PR definitely addresses the issue 👍
/lgtm
/approve

[tekton-robot]

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[ncskier]

/test pull-tekton-triggers-build-tests