Status conformance tests for channels

[aliok]

Fixes #2992

Proposed Changes

• Conformance tests for Channel status
• Does not include tests for Conformance tests for channel subscriber status requirements #2993 nor Conformance testing for Channel URL #1958

Verification happy case:

go test -v -timeout 30s -tags e2e knative.dev/eventing/test/conformance -run ^TestChannelStatus$ -channels="messaging.knative.dev/v1alpha1:InMemoryChannel,messaging.knative.dev/v1alpha1:Channel,messaging.knative.dev/v1beta1:InMemoryChannel"

Verification unhappy case:
To make the test fail for a non-compliant channel:

• create a CRD like following

cat <<EOS |kubectl apply -f -
---
apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: foochannels.example.com
spec:
  group: example.com
  versions:
    - name: v1
      served: true
      storage: true
  scope: Namespaced
  names:
    plural: foochannels
    singular: foochannel
    kind: FooChannel
EOS

• comment out the client.WaitForResourceReadyOrFail(channelName, &channel) line as the CR for that CRD won't be Ready never ever
• Run the test:

go test -v -timeout 30s -tags e2e knative.dev/eventing/test/conformance -run ^TestChannelStatus$ -channels="example.com/v1:FooChannel"

The test will fail:

{"FooChannel" "example.com/v1"} does not have status.address

[matzew]

/test pull-knative-eventing-unit-tests

[aliok]

@aslom @matzew mind reviewing?

[aliok]

I will write a separate test for the negative case and send a new PR.
(thanks @matzew for the suggestion)

[matzew]

/lgtm

leaving final review/approval for @aslom

[aslom]

Great work

/lgtm

[matzew]

/approve

[knative-prow-robot]

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[aliok]

I will write a separate test for the negative case and send a new PR.

I won't do it.
This test is about conformance of the channels. So, if you have a new channel it should pass these conformance tests. Testing an imaginary channel against the conformance tests didn't sound good on a second thought.
If we really want to "test the test", we might come up with a separate execution of this test for the imaginary channel and see if the test fails.