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kcc-direct-mockgcp-implementer

Testing & Quality
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Guides the implementation of Phase 3 (MockGCP and Alignment) for a direct KCC resource, verifying behavioral correctness against simulated GCP services. Use this when you need to implement or align mockgcp for a KCC resource.

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KCC Direct MockGCP Implementer

This skill guides you through implementing Phase 3 (MockGCP and Alignment) for a direct KCC resource to verify behavioral correctness against simulated GCP services.

Inputs

  • ResourceKind: The kind of the resource (e.g., VertexAIDataset).
  • service_name: The short name of the GCP service (e.g., aiplatform).
  • api_version: The KCC API version (e.g., v1alpha1, v1beta1).
  • group: The API group (e.g., vertexai).
  • kind_lowercase: The lowercase kind name (e.g., vertexaidataset).
  • testname: The specific test folder name under pkg/test/resourcefixture/testdata/basic/<group>/<api_version>/<kind_lowercase>/.

Workflow

1. Locate E2E Fixtures

  • The test fixtures are located under pkg/test/resourcefixture/testdata/basic/<group>/<api_version>/<kind_lowercase>/.

2. Add or Enhance Mock Service

  • If a mock service for <service_name> does not exist under mockgcp/mock<service_name>/, create one:
    • Follow the guide in mockgcp/GEMINI.md and mockgcp/README.md.
    • Add the relevant proto to the Makefile and run make gen-proto if needed.
    • Implement the mock service entrypoint in mockgcp/mock<service_name>/service.go and register it in mockgcp/register.go.
  • If the mock service already exists, implement the necessary CRUD (Create, Read, Update, Delete) methods for <ResourceKind> in mockgcp/mock<service_name>/<kind_lowercase>.go.

3. Incremental Mock Alignment

  • Run hack/compare-mock "fixtures/^<testname>
    quot;     to execute the tests against the mock implementation.
  • Use the fix-diffs-mockgcp skill (mockgcp/.gemini/skills/fix-diffs-mockgcp/SKILL.md) to align the mock logs with the real GCP output:
    • Output-Only Fields/IDs: If real GCP produces dynamic values that mockgcp lacks, implement a populate<ResourceKind>Defaults function in mockgcp/mock<service_name>/<kind_lowercase>.go called on Insert and Get to match the required format.
    • Volatile/Random Values: For values like timestamps or etags that are functionally identical but structurally unpredictable, update normalize.go for the service.
    • Critical Rule: Always scope the Previsit normalization in normalize.go to ensure it only applies to your service URL (e.g. strings.Contains(event.URL(), "<service_name>.googleapis.com")) to prevent log corruption in unrelated services.
  • Iterate on running hack/compare-mock "fixtures/^<testname>
    quot;     and making incremental code updates until the HTTP logs match real GCP perfectly with clean, minimal diffs.
  • Once the logs align, run the comparison with WRITE_GOLDEN_OUTPUT=1 against mock GCP to generate the _http_mock.log file: 
    WRITE_GOLDEN_OUTPUT=1 RUN_E2E=1 E2E_GCP_TARGET=mock E2E_KUBE_TARGET=envtest go test -v ./tests/e2e -run "TestAllInSeries/fixtures/<testname>"
    Make sure both _http.log and _http_mock.log are present in the fixture directory.

4. Verify and Run Presubmits

  • Run local validation: scripts/validate-prereqs.sh.
  • Run the e2e fixtures presubmit: ./dev/ci/presubmits/tests-e2e-fixtures-<kind_lowercase>.
  • Make sure to stage and commit both _http.log and _http_mock.log files in your Pull Request.