CCO-837: Replace deprecated golang/mock with go.uber.org/mock

docs/K8S_1.36_UPGRADE.md

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+# Kubernetes 1.36 Upgrade - Implementation Details
+
+**Jira:** CCO-834, CCO-835, CCO-836  
+**PR:** #1066  
+**Status:** Complete
+
+## Overview
+
+This document details the Kubernetes 1.36 upgrade for Cloud Credential Operator (CCO), including the core upgrade, CI implementation, and e2e testing.
+
+## CCO-834: Core K8s 1.36 Upgrade
+
+### Problem
+Kubernetes 1.36 removed the `HasSynced()` method from controller-runtime's cache interface and replaced it with `HasSyncedChecker()`. CCO's controller manager setup code called `HasSynced()` which caused compilation failures.
+
+### Solution
+Updated `library-go` dependency to v0.0.0-20260716104731-fdf18b82797f which includes the HasSyncedChecker() implementation from PR openshift/library-go#2171.
+
+### Changes
+- **go.mod**: Updated library-go to fdf18b82797f
+- **go.sum**: Updated checksums
+- **vendor/**: Updated vendored dependencies
+
+### Testing
+- ✅ Build passes
+- ✅ Unit tests pass
+- ✅ E2E tests pass
+
+## CCO-835: CI Implementation
+
+### Overview
+Added CI configuration and documentation for K8s 1.36 upgrade testing.
+
+### CI Strategy
+OpenShift uses Prow for CI. The existing CI jobs automatically test against K8s 1.36 once the cluster version is updated. No additional CI job configuration is required in the CCO repository.
+
+### CI Jobs That Validate K8s 1.36
+- `ci/prow/unit` - Unit tests (validates compilation with K8s 1.36 APIs)
+- `ci/prow/verify` - Code verification
+- `ci/prow/images` - Image builds
+- `ci/prow/e2e-aws-ovn` - E2E tests on AWS
+- `ci/prow/e2e-aws-cco-parallel` - Parallel CCO tests
+- `ci/prow/e2e-hypershift` - Hypershift tests
+- `ci/prow/e2e-upgrade` - Upgrade tests
+- `ci/prow/security` - Security scans
+
+### What Was Done
+1. **Documentation** - This file documents the K8s 1.36 changes
+2. **E2E Tests** - Created K8s 1.36 specific e2e tests (see CCO-836)
+3. **Verification** - All existing CI jobs now validate K8s 1.36 compatibility
+
+### CI Configuration Location
+CI configuration for OpenShift repos is managed centrally in:
+- Repository: `openshift/release`
+- Path: `ci-operator/config/openshift/cloud-credential-operator/`
+
+No changes to central CI config are required - existing jobs automatically test K8s 1.36.
+
+## CCO-836: E2E Testing
+
+### Overview
+Created Kubernetes 1.36 specific e2e tests to verify HasSyncedChecker functionality and controller manager startup.
+
+### Test File
+`test/e2e/k8s136/k8s_1_36_upgrade_test.go`
+
+### Test Cases
+
+#### 1. TestK8s136HasSyncedChecker
+Verifies CCO works correctly with K8s 1.36's HasSyncedChecker:
+- **Deployment Health**: Checks CCO deployment is running
+- **Pod Status**: Verifies CCO pods are in Running state
+- **Log Analysis**: Checks logs for HasSyncedChecker errors or compatibility issues
+
+**What It Tests:**
+- CCO deployment has ready replicas
+- At least one CCO pod is running
+- No errors related to:
+  - HasSyncedChecker
+  - Undefined methods
+  - Controller manager failures
+  - Cache sync timeouts
+
+#### 2. TestK8s136ControllerManagerStarts
+Verifies the controller manager starts successfully:
+- **Deployment Availability**: Checks deployment Available condition
+- **Controller Health**: Ensures controller manager is operational
+
+**What It Tests:**
+- CCO deployment condition is "Available=True"
+
+### Running E2E Tests
+
+**Locally (requires cluster):**
+```bash
+# Set KUBECONFIG
+export KUBECONFIG=/path/to/kubeconfig
+
+# Run K8s 1.36 tests
+go test -v -tags e2e ./test/e2e/k8s136/...
+```
+
+**In CI:**
+E2E tests run automatically as part of:
+- `ci/prow/e2e-aws-ovn`
+- `ci/prow/e2e-aws-cco-parallel`
+- `ci/prow/e2e-hypershift`
+
+### Test Coverage
+
+**What's Covered:**
+- ✅ HasSyncedChecker usage (K8s 1.36 requirement)
+- ✅ Controller manager startup
+- ✅ CCO deployment health
+- ✅ Pod runtime status
+- ✅ Log error detection
+
+**What's NOT Covered (intentionally):**
+- ❌ Specific K8s 1.36 features (none apply to CCO)
+- ❌ API server version check (handled by cluster)
+- ❌ Feature gate changes (none affecting CCO)
+
+## Implementation Timeline
+
+1. **July 15, 2026** - library-go#2171 merged with HasSyncedChecker
+2. **July 16, 2026** - CCO updated to use official library-go
+3. **July 16, 2026** - E2E tests added
+4. **July 16, 2026** - Documentation complete
+
+## Verification Checklist
+
+### Code Changes
+- [x] Updated library-go dependency
+- [x] Removed temporary replace directive
+- [x] Ran `go mod tidy`
+- [x] Ran `go mod vendor`
+- [x] No code changes needed (library-go handles it)
+
+### Testing
+- [x] Unit tests pass (`make test`)
+- [x] Build succeeds (`make build`)
+- [x] E2E tests created
+- [x] CI tests passing
+
+### Documentation
+- [x] This upgrade guide created
+- [x] E2E test documentation
+- [x] CI strategy documented
+
+## Dependencies
+
+### Upstream Dependencies
+- **library-go** v0.0.0-20260716104731-fdf18b82797f
+  - Provides HasSyncedChecker() implementation
+  - PR: openshift/library-go#2171
+  - Merged: July 15, 2026
+
+### Related Changes
+- **openshift/api** - K8s 1.36 API updates (already merged)
+- **openshift/client-go** - K8s 1.36 client updates (already merged)
+
+## Breaking Changes
+
+**None.** The K8s 1.36 upgrade is backward compatible. HasSyncedChecker() works with both K8s 1.35 and 1.36.
+
+## Rollback Plan
+
+If K8s 1.36 causes issues:
+1. Revert library-go to previous version
+2. Restore replace directive if needed
+3. Rebuild and redeploy
+
+**Note:** No rollback should be necessary as library-go maintains compatibility.
+
+## References
+
+- **library-go PR**: https://github.com/openshift/library-go/pull/2171
+- **CCO PR**: https://github.com/openshift/cloud-credential-operator/pull/1066
+- **Jira CCO-834**: Core K8s 1.36 upgrade
+- **Jira CCO-835**: CI implementation
+- **Jira CCO-836**: E2E testing
+
+## Contact
+
+For questions:
+- **Owner**: Erica Hinkle (ehinkle@redhat.com)
+- **Team**: OpenShift Cloud Credential Operator
+- **Slack**: #forum-cco