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2025-11-17 00:07:51 -08:00

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iOS Prefetch Plugin Testing and Validation Enhancements - Applied

Date: 2025-11-15
Status: ✅ Applied to codebase
Directive Source: User-provided comprehensive enhancement directive

Summary

This document tracks the application of comprehensive enhancements to the iOS prefetch plugin testing and validation system. All improvements from the directive have been systematically applied to the codebase.

1. Technical Correctness Improvements ✅

1.1 Robust BGTask Scheduling & Lifecycle

Applied to: ios/Plugin/DailyNotificationBackgroundTaskTestHarness.swift

Enhancements:

  • ✅ Validation of Scheduling Conditions: Added validation to ensure earliestBeginDate is at least 60 seconds in future (iOS requirement)
  • ✅ Simulator Error Handling: Added graceful handling of Code=1 error (expected on simulator) with clear logging
  • ✅ One Active Task Rule: Implemented cancelPendingTask() method to enforce only one prefetch task per notification
  • ✅ Debug Verification: Added verifyOneActiveTask() helper method to verify only one task is pending
  • ✅ Schedule Next Task at Execution: Updated handler to schedule next task IMMEDIATELY at start (Apple best practice)
  • ✅ Expiration Handler: Enhanced expiration handler to ensure task completion even on timeout
  • ✅ Completion Guarantee: Added guard to ensure setTaskCompleted() is called exactly once
  • ✅ Error Handling: Enhanced error handling with proper logging and fallback behavior

Code Changes:

  • Enhanced schedulePrefetchTask() with validation and one-active-task rule
  • Updated handlePrefetchTask() to follow Apple's best practice pattern
  • Added cancelPendingTask() and verifyOneActiveTask() methods
  • Improved PrefetchOperation with failure tracking

1.2 Enhanced Scheduling and Notification Coordination

Applied to: Documentation in IOS_TEST_APP_REQUIREMENTS.md

Enhancements:

  • ✅ Added "Technical Correctness Requirements" section
  • ✅ Documented unified scheduling logic requirements
  • ✅ Documented BGTask identifier constant verification
  • ✅ Documented concurrency considerations for Phase 2
  • ✅ Documented OS limits and tolerance expectations

2. Testing Coverage Expansion ✅

2.1 Edge Case Scenarios and Environment Conditions

Applied to: doc/test-app-ios/IOS_PREFETCH_TESTING.md

Enhancements:

  • ✅ Expanded Edge Case Table: Added comprehensive table with 7 scenarios:
    • Background Refresh Off
    • Low Power Mode On
    • App Force-Quit
    • Device Timezone Change
    • DST Transition
    • Multi-Day Scheduling (Phase 2)
    • Device Reboot
  • ✅ Test Strategy: Each scenario includes test strategy and expected outcome
  • ✅ Additional Variations: Documented battery vs plugged, force-quit vs backgrounded, etc.

2.2 Failure Injection and Error Handling Tests

Applied to: doc/test-app-ios/IOS_PREFETCH_TESTING.md and IOS_TEST_APP_REQUIREMENTS.md

Enhancements:

  • ✅ Expanded Negative-Path Tests: Added 8 new failure scenarios:
    • Storage unavailable
    • JWT expiration
    • Timezone drift
    • Corrupted cache
    • BGTask execution failure
    • Repeated scheduling calls
    • Permission revoked mid-run
  • ✅ Error Handling Section: Added comprehensive error handling test cases to test app requirements
  • ✅ Expected Outcomes: Each failure scenario includes expected plugin behavior

2.3 Automated Testing Strategies

Applied to: doc/test-app-ios/IOS_PREFETCH_TESTING.md

Enhancements:

  • ✅ Unit Tests Section: Added comprehensive unit test strategy:
    • Time calculations
    • TTL validation
    • JSON mapping
    • Permission check flow
    • BGTask scheduling logic
  • ✅ Integration Tests Section: Added integration test strategies:
    • Xcode UI Tests
    • Log sequence validation
    • Mocking and dependency injection
  • ✅ BGTask Expiration Coverage: Added test strategy for expiration handler

3. Validation and Verification Enhancements ✅

3.1 Structured Logging and Automated Log Analysis

Applied to: doc/test-app-ios/IOS_PREFETCH_TESTING.md

Enhancements:

  • ✅ Structured Log Output (JSON): Added JSON schema examples for:
    • Success events
    • Failure events
    • Cycle complete summary
  • ✅ Log Validation Script: Added complete validate-ios-logs.sh script with:
    • Sequence marker detection
    • Automated validation logic
    • Usage instructions
  • ✅ Distinct Log Markers: Documented log marker requirements

3.2 Enhanced Verification Signals

Applied to: doc/test-app-ios/IOS_PREFETCH_TESTING.md and IOS_TEST_APP_REQUIREMENTS.md

Enhancements:

  • ✅ Telemetry Counters: Documented all expected counters:
    • dnp_prefetch_scheduled_total
    • dnp_prefetch_executed_total
    • dnp_prefetch_success_total
    • dnp_prefetch_failure_total{reason="NETWORK|AUTH|SYSTEM"}
    • dnp_prefetch_used_for_notification_total
  • ✅ State Integrity Checks: Added verification methods:
    • Content hash verification
    • Schedule hash verification
    • Persistence verification
  • ✅ Persistent Test Artifacts: Added JSON schema for test run artifacts
  • ✅ UI Indicators: Added requirements for status display and operation summary
  • ✅ In-App Log Viewer: Documented Phase 2 enhancement for QA use

3.3 Test Run Result Template Enhancement

Applied to: doc/test-app-ios/IOS_PREFETCH_TESTING.md

Enhancements:

  • ✅ Enhanced Template: Added fields for:
    • Actual execution time vs scheduled
    • Telemetry counters
    • State verification (content hash, schedule hash, cache persistence)
  • ✅ Persistent Artifacts: Added note about test app saving summary to file

4. Documentation Updates ✅

4.1 Test App Requirements

Applied to: doc/test-app-ios/IOS_TEST_APP_REQUIREMENTS.md

Enhancements:

  • ✅ Technical Correctness Requirements: Added comprehensive section covering:
    • BGTask scheduling & lifecycle
    • Scheduling and notification coordination
  • ✅ Error Handling Expansion: Added 7 new error handling test cases
  • ✅ UI Indicators: Added requirements for status display, operation summary, and dump prefetch status
  • ✅ In-App Log Viewer: Documented Phase 2 enhancement
  • ✅ Persistent Schedule Snapshot: Enhanced with content hash and schedule hash fields

4.2 Testing Guide

Applied to: doc/test-app-ios/IOS_PREFETCH_TESTING.md

Enhancements:

  • ✅ Edge Case Scenarios Table: Comprehensive table with test strategies
  • ✅ Failure Injection Tests: 8 new negative-path scenarios
  • ✅ Automated Testing Strategies: Complete unit and integration test strategies
  • ✅ Validation Enhancements: Log validation script, structured logging, verification signals
  • ✅ Test Run Template: Enhanced with telemetry and state verification fields

5. Code Enhancements ✅

5.1 Test Harness Improvements

File: ios/Plugin/DailyNotificationBackgroundTaskTestHarness.swift

Changes:

  • Enhanced schedulePrefetchTask() with validation and one-active-task enforcement
  • Added cancelPendingTask() method
  • Added verifyOneActiveTask() debug helper
  • Updated handlePrefetchTask() to follow Apple best practices
  • Enhanced PrefetchOperation with failure tracking
  • Improved error handling and logging throughout

Key Features:

  • Validates minimum 60-second lead time
  • Enforces one active task rule
  • Handles simulator limitations gracefully
  • Schedules next task immediately at execution start
  • Ensures task completion even on expiration
  • Prevents double completion

6. Files Modified

  1. ✅ ios/Plugin/DailyNotificationBackgroundTaskTestHarness.swift - Enhanced with technical correctness improvements
  2. ✅ doc/test-app-ios/IOS_PREFETCH_TESTING.md - Expanded testing coverage and validation enhancements
  3. ✅ doc/test-app-ios/IOS_TEST_APP_REQUIREMENTS.md - Added technical correctness requirements and enhanced error handling

7. Next Steps

Immediate (Phase 1)

  • Implement actual prefetch logic using enhanced test harness as reference
  • Create validate-ios-logs.sh script ✅ COMPLETE - Script created at scripts/validate-ios-logs.sh
  • Add UI indicators to test app
  • Implement persistent test artifacts export

Phase 2

  • Wire telemetry counters to production pipeline
  • Implement in-app log viewer
  • Add automated CI pipeline integration
  • Test multi-day scenarios with varying TTL values

8. Validation Checklist

  • Technical correctness improvements applied to test harness
  • Edge case scenarios documented with test strategies
  • Failure injection tests expanded
  • Automated testing strategies documented
  • Structured logging schema defined
  • Log validation script provided ✅ COMPLETE - Script created at scripts/validate-ios-logs.sh
  • Enhanced verification signals documented
  • Test run template enhanced
  • Documentation cross-referenced and consistent
  • Code follows Apple best practices

References

  • Main Directive: doc/directives/0003-iOS-Android-Parity-Directive.md
  • Testing Guide: doc/test-app-ios/IOS_PREFETCH_TESTING.md
  • Test App Requirements: doc/test-app-ios/IOS_TEST_APP_REQUIREMENTS.md
  • Test Harness: ios/Plugin/DailyNotificationBackgroundTaskTestHarness.swift
  • Glossary: doc/test-app-ios/IOS_PREFETCH_GLOSSARY.md

Status: All enhancements from the directive have been systematically applied to the codebase. The plugin is now ready for Phase 1 implementation with comprehensive testing and validation infrastructure in place.

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