Implementation Plan

• [ ] 1. Set up core interfaces and testing foundation

  • Create TypeScript interfaces for AB test configuration, variant assignments, and event tracking
  • Define standard A/B/C/D/E/F variant types and traffic allocation models
  • Implement error types and testing utilities interfaces
  • Write unit tests for interface validation and type safety
  • Requirements: 1.1, 1.2, 1.3, 1.5, 2.1, 2.2, 3.1, 3.2, 3.3, 4.1, 4.2, 6.1, 6.2, 8.1, 8.2, 9.1, 9.2

• [ ] 2. Implement variant assignment service with TDD

• [ ] 2.1 Write tests for deterministic hash-based assignment algorithm

  • Create unit tests for variant assignment logic using user ID and test ID hashing
  • Write tests for traffic allocation and percentage-based distribution scenarios
  • Test assignment persistence and consistency across sessions
  • Requirements: 1.2, 1.3, 1.4, 1.5

• [ ] 2.2 Implement variant assignment service to pass tests

  • Write variant assignment logic using user ID and test ID hashing
  • Implement traffic allocation and percentage-based distribution
  • Create assignment persistence using NgRx store and local storage
  • Requirements: 1.2, 1.3, 1.4, 1.5

• [ ] 2.3 Write tests for assignment lifecycle management

  • Create unit tests for assignment expiration and cleanup logic
  • Write tests for sticky assignment functionality across sessions
  • Test assignment validation and error handling scenarios
  • Requirements: 1.4, 4.4, 7.2

• [ ] 2.4 Implement assignment lifecycle management to pass tests

  • Implement assignment expiration and cleanup logic
  • Create sticky assignment functionality for cross-session persistence
  • Add assignment validation and error handling
  • Requirements: 1.4, 4.4, 7.2

• [ ] 3. Build NgRx state management with TDD

• [ ] 3.1 Write tests for AB test actions, reducer, and selectors

  • Create unit tests for NgRx actions covering variant assignment and test configuration
  • Write tests for reducer state transitions and immutability
  • Test selectors for variant assignments and test configurations
  • Requirements: 1.3, 1.4, 4.1, 4.2

• [ ] 3.2 Implement NgRx state management to pass tests

  • Write NgRx actions for variant assignment, test configuration, and event tracking
  • Implement reducer to manage AB test state including assignments and active tests
  • Create selectors for variant assignments and test configurations
  • Requirements: 1.3, 1.4, 4.1, 4.2

• [ ] 3.3 Write tests for AB test effects and API integration

  • Create unit tests for effects handling variant assignment loading and creation
  • Write tests for loading active test configurations
  • Test effects for event batching and analytics API communication
  • Requirements: 3.4, 3.7, 4.1, 4.2, 4.3

• [ ] 3.4 Implement AB test effects to pass tests

  • Write effects to handle variant assignment loading and creation
  • Implement effects for loading active test configurations
  • Create effects for event batching and analytics API communication
  • Requirements: 3.4, 3.7, 4.1, 4.2, 4.3

• [ ] 4. Create event tracking and batching system with TDD

• [ ] 4.1 Write tests for event batcher service

  • Create unit tests for event queuing with configurable batch size and flush intervals
  • Write tests for retry logic and failed event submission handling
  • Test fire-and-forget event sending with error scenarios
  • Requirements: 3.5, 3.6, 3.7, 3.8

• [ ] 4.2 Implement event batcher service to pass tests

  • Implement event queuing with configurable batch size and flush intervals
  • Add retry logic for failed event submissions
  • Create fire-and-forget event sending with error handling
  • Requirements: 3.5, 3.6, 3.7, 3.8

• [ ] 4.3 Write tests for user journey tracking

  • Create unit tests for journey event collection and session management
  • Write tests for page navigation tracking with variant assignments
  • Test funnel analysis data collection and user flow tracking
  • Requirements: 6.1, 6.2, 6.3, 6.4, 6.5

• [ ] 4.4 Implement user journey tracking to pass tests

  • Create journey event collection and session management
  • Add page navigation tracking with variant assignments
  • Implement funnel analysis data collection
  • Requirements: 6.1, 6.2, 6.3, 6.4, 6.5

• [ ] 5. Build template rendering components with TDD

• [ ] 5.1 Write tests for AB test structural directive

  • Create unit tests for campusAbTest directive conditional template rendering
  • Write tests for variant-specific template rendering with impression tracking
  • Test fallback template handling for unassigned variants
  • Requirements: 2.1, 2.2, 2.3, 2.4

• [ ] 5.2 Implement AB test structural directive to pass tests

  • Write campusAbTest directive for conditional template rendering
  • Add variant-specific template rendering with impression tracking
  • Implement fallback template handling for unassigned variants
  • Requirements: 2.1, 2.2, 2.3, 2.4

• [ ] 5.3 Write tests for AB test wrapper component

  • Create unit tests for campus-ab-test component with content projection
  • Write tests for multi-variant template switching (A/B/C/D/E/F)
  • Test automatic impression tracking and error handling
  • Requirements: 2.1, 2.2, 2.3, 2.5

• [ ] 5.4 Implement AB test wrapper component to pass tests

  • Create campus-ab-test component with content projection
  • Implement multi-variant template switching (A/B/C/D/E/F)
  • Add automatic impression tracking and error handling
  • Requirements: 2.1, 2.2, 2.3, 2.5

• [ ] 6. Create main AB test service with TDD

• [ ] 6.1 Write tests for core AB test service

  • Create unit tests for AB test service variant assignment and tracking methods
  • Write tests for NgRx store integration and state management
  • Test conversion tracking and custom event recording functionality
  • Requirements: 4.1, 4.2, 4.3, 8.5

• [ ] 6.2 Implement core AB test service to pass tests

  • Write AB test service implementing variant assignment and tracking
  • Add integration with NgRx store for state management
  • Implement conversion tracking and custom event recording
  • Requirements: 4.1, 4.2, 4.3, 8.5

• [ ] 6.3 Write tests for success metrics and analytics integration

  • Create unit tests for success metric tracking with weighted scoring
  • Write tests for statistical significance calculation utilities
  • Test cohort analysis and user segmentation support
  • Requirements: 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8

• [ ] 6.4 Implement success metrics and analytics integration to pass tests

  • Implement success metric tracking with weighted scoring
  • Create statistical significance calculation utilities
  • Add cohort analysis and user segmentation support
  • Requirements: 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8

• [ ] 7. Build configuration and environment management with TDD

• [ ] 7.1 Write tests for environment-specific configuration

  • Create unit tests for configuration service supporting dev/staging/production settings
  • Write tests for data retention policy configuration
  • Test GDPR compliance and user consent handling
  • Requirements: 7.1, 7.2, 7.3, 7.4

• [ ] 7.2 Implement environment-specific configuration to pass tests

  • Create configuration service for dev/staging/production settings
  • Add data retention policy configuration
  • Implement GDPR compliance and user consent handling
  • Requirements: 7.1, 7.2, 7.3, 7.4

• [ ] 7.3 Write tests for debugging and monitoring capabilities

  • Create unit tests for debug mode with detailed logging and variant visibility
  • Write tests for error tracking and circuit breaker patterns
  • Test performance monitoring for AB test impact
  • Requirements: 7.5

• [ ] 7.4 Implement debugging and monitoring capabilities to pass tests

  • Create debug mode with detailed logging and variant visibility
  • Implement error tracking and circuit breaker patterns
  • Add performance monitoring for AB test impact
  • Requirements: 7.5

• [ ] 8. Create Campus integration layer with TDD

• [ ] 8.1 Write tests for authentication service integration

  • Create unit tests for Campus authentication integration using dependency injection tokens
  • Write tests for user role-based test inclusion/exclusion rules
  • Test user preference and opt-out handling
  • Requirements: 8.1, 8.2, 8.3, 8.4, 8.5

• [ ] 8.2 Implement authentication service integration to pass tests

  • Create integration with Campus authentication using dependency injection tokens
  • Add user role-based test inclusion/exclusion rules
  • Implement user preference and opt-out handling
  • Requirements: 8.1, 8.2, 8.3, 8.4, 8.5

• [ ] 8.3 Write tests for API service and backend communication

  • Create unit tests for API service variant assignment persistence
  • Write tests for active test configuration loading
  • Test analytics event submission to Campus data pipeline
  • Requirements: 3.4, 3.8, 4.1, 4.3

• [ ] 8.4 Implement API service for backend communication to pass tests

  • Create API service for variant assignment persistence
  • Implement active test configuration loading
  • Add analytics event submission to Campus data pipeline
  • Requirements: 3.4, 3.8, 4.1, 4.3

• [ ] 9. Build testing utilities and mocks with TDD

• [ ] 9.1 Write tests for unit testing utilities

  • Create unit tests for mock services and variant assignment testing utilities
  • Write tests for test utilities that force specific variant rendering
  • Test helper functions for event tracking validation
  • Requirements: 9.1, 9.2, 9.3

• [ ] 9.2 Implement unit testing utilities to pass tests

  • Write mock services for variant assignment testing
  • Implement test utilities for forcing specific variant rendering
  • Create helper functions for event tracking validation
  • Requirements: 9.1, 9.2, 9.3

• [ ] 9.3 Write tests for E2E testing support

  • Create unit tests for E2E helpers that control deterministic AB test behavior
  • Write tests for test state reset utilities
  • Test debugging information and error message utilities
  • Requirements: 9.3, 9.4, 9.5

• [ ] 9.4 Implement E2E testing support to pass tests

  • Create E2E helpers for deterministic AB test behavior
  • Implement test state reset utilities
  • Add debugging information and error message utilities
  • Requirements: 9.3, 9.4, 9.5

• [ ] 10. Add comprehensive error handling and resilience with TDD

• [ ] 10.1 Write tests for error handling and resilience

  • Create unit tests for graceful degradation with control variant fallbacks
  • Write tests for event queuing in offline scenarios with retry logic
  • Test comprehensive error logging and circuit breaker patterns
  • Requirements: 3.5, 7.5

• [ ] 10.2 Implement error handling and resilience to pass tests

  • Implement graceful degradation with control variant fallbacks
  • Create event queuing for offline scenarios with retry logic
  • Add comprehensive error logging and circuit breaker patterns
  • Requirements: 3.5, 7.5

• [ ] 11. Create library module and public API with TDD

• [ ] 11.1 Write tests for library module and public API

  • Create unit tests for AB test library module exports and configuration
  • Write tests for dependency injection tokens and providers
  • Test comprehensive public API functionality and integration patterns
  • Requirements: 8.5, 9.1, 9.2

• [ ] 11.2 Implement library module and public API to pass tests

  • Set up AB test library module with proper exports
  • Configure dependency injection tokens and providers
  • Create comprehensive public API with documentation
  • Add library integration examples and usage patterns
  • Requirements: 8.5, 9.1, 9.2

• [ ] 12. Write integration tests and end-to-end validation

  • Create integration tests for complete AB test workflows
  • Write tests for template rendering with variant assignment
  • Test event tracking through the entire analytics pipeline
  • Validate error handling and edge cases in realistic scenarios
  • Requirements: 9.1, 9.2, 9.3, 9.4, 9.5