test(e2e): add end-to-end testing framework

[STRRL]

Add comprehensive E2E testing framework that validates the controller functionality with real Cloudflare Tunnel and DNS configurations. The test suite spins up a temporary minikube cluster, deploys the controller, and validates connectivity through Cloudflare Tunnel.

Key additions:

• E2E test suite with happy path validation
• Makefile targets for E2E testing (e2e, e2e-image)
• Test documentation with prerequisites and execution guide
• Browser screenshot capture capability for dashboard validation
• Automated cleanup of test resources (DNS records, minikube profile)

[claude]

Claude finished @STRRL's task —— View job

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PR Review: E2E Testing Framework

I've completed a comprehensive review of the E2E testing framework implementation. This is a well-engineered addition that significantly enhances the project's testing capabilities. Here's my detailed analysis:

Todo List:

• Read repository context and guidelines
• Examine all changed files
• Analyze E2E test implementation
• Review security considerations
• Evaluate performance implications
• Check test coverage and approach
• Provide comprehensive feedback

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✅ Strengths

Architecture & Design

• Excellent separation of concerns: Clean split between test suite setup (suite_test.go) and actual test scenarios (happy_path_test.go)
• Comprehensive happy path coverage: Tests the full end-to-end workflow from minikube setup to Cloudflare tunnel verification
• Proper resource lifecycle management: Uses Ginkgo's DeferCleanup for reliable cleanup of resources

Code Quality

• Robust error handling: Comprehensive validation at each step with meaningful error messages
• Good use of contexts: Proper timeout management throughout the test lifecycle
• Clean abstractions: Well-designed helper functions like waitFor(), parseImageRef(), buildDashboardHostname()
• Consistent naming conventions: Follows Go best practices and project conventions

Testing Best Practices

• Real-world validation: Tests against actual Cloudflare infrastructure, not mocks
• Progressive verification: Each step builds on the previous, with clear failure points
• Visual validation: Screenshot capability provides additional debugging assistance
• Proper isolation: Each test run uses unique minikube profiles and DNS hostnames

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🔍 Areas for Improvement

Security Considerations

1. Environment variable exposure (lines 55-58 in happy_path_test.go):

   values.Cloudflare.APIToken = os.Getenv("CLOUDFLARE_API_TOKEN")

   • ✅ Good: Uses environment variables instead of hardcoded secrets
   • ⚠️ Consider: The Helm values logging at line 296-297 could potentially expose sensitive data lengths

2. Temporary file handling (lines 101-108 in suite_test.go):

   • ✅ Good: Properly closes and removes temporary kubeconfig files
   • ✅ Good: Uses restrictive permissions (0o644) for screenshot artifacts

Performance & Resource Management

1. Resource-intensive setup:

   • Minikube cluster creation (20min timeout) is appropriately lengthy
   • Image loading and Helm installation have reasonable timeouts
   • Consider adding parallel test support documentation

2. Network resilience (lines 202-225 in happy_path_test.go):

   • ✅ Good: 15-minute timeout with 20-second intervals for Cloudflare propagation
   • ✅ Good: Validates both HTTP status and content

Code Quality Observations

1. Mixed language documentation (test/e2e/README.md):

   • Documentation is in Chinese, which may limit accessibility
   • Consider adding English version or translating existing content

2. Error handling patterns:

   • Consistent use of wrapped errors with context
   • Good balance between failing fast and providing helpful diagnostics

3. Dependencies (go.mod changes):

   • ✅ Appropriate: chromedp for browser automation
   • ✅ Appropriate: godotenv for configuration management
   • All dependencies are well-maintained and suitable for the use case

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🛠 Technical Implementation Details

Makefile Integration

• Clean separation of concerns with e2e-image and e2e targets
• Configurable image name via E2E_CONTROLLER_IMAGE
• Integrates well with existing build pipeline

Test Structure

• Follows Ginkgo/Gomega patterns established in the project
• Uses Eventually() appropriately for asynchronous operations
• Good use of descriptive test phases with By() statements

Kubernetes Integration

• Proper use of typed Kubernetes clients
• Correct resource creation and cleanup patterns
• Appropriate use of label selectors for resource discovery

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📋 Recommendations

1. Documentation: Consider adding English translation to test/e2e/README.md for broader accessibility

2. Security: Review Helm values logging to ensure no sensitive data is inadvertently exposed

3. Monitoring: The extensive logging and screenshot capabilities are excellent for debugging

4. CI Integration: This framework provides a solid foundation for adding E2E tests to CI pipelines

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🎯 Overall Assessment

This is a high-quality implementation that significantly enhances the project's testing capabilities. The code demonstrates:

• Strong understanding of Kubernetes testing patterns
• Proper resource lifecycle management
• Excellent error handling and debugging support
• Real-world validation approach

The E2E framework provides comprehensive coverage of the controller's primary use case and will be invaluable for catching integration issues. The implementation follows Go and Kubernetes best practices and integrates well with the existing codebase architecture.

Recommendation: ✅ Approve with minor suggestions addressed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 40.12%. Comparing base (731a865) to head (861e771).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #229   +/-   ##
=======================================
  Coverage   40.12%   40.12%           
=======================================
  Files          10       10           
  Lines         770      770           
=======================================
  Hits          309      309           
  Misses        437      437           
  Partials       24       24           

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