/**
 * Circuit Breaker Consolidation Tests - GREEN Phase
 *
 * Task: postgres-eykz - Consolidate circuit breakers to shared package
 *
 * This file tests the unified circuit breaker implementation that consolidates
 * all previous duplicate implementations into a single shared module.
 *
 * ## Duplicate Implementations Found:
 *
 * 1. packages/shared/src/circuit-breaker.ts
 *    - Most complete implementation
 *    - Uses string literal union type: 'CLOSED' | 'OPEN' | 'HALF_OPEN'
 *    - Supports multi-instance tracking (per DO)
 *    - Has exponential backoff
 *    - Has metrics collector integration
 *    - Has DOCircuitBreakerWrapper for DO stubs
 *    - Re-exports CircuitOpenError from errors.ts
 *
 * 2. packages/postgres.do/src/cdc/circuit-breaker.ts
 *    - CDC-specific implementation
 *    - Uses enum: CircuitState.CLOSED, etc.
 *    - Single-instance (no multi-tenant tracking)
 *    - Uses CDCCircuitOpenError (different error class)
 *    - Has executeWithRetry method
 *    - Uses timer-based recovery (setTimeout)
 *    - Has destroy() method for cleanup
 *
 * 3. packages/postgres/src/routing/circuit-breaker.ts
 *    - Nearly identical to shared implementation
 *    - Copy-pasted with minor differences
 *    - Has its own CircuitOpenError class
 *    - Missing re-export from errors module
 *
 * ## Key Differences to Reconcile:
 *
 * - State type: string literals vs enum
 * - Error class: CircuitOpenError vs CDCCircuitOpenError
 * - Instance tracking: multi-instance vs single-instance
 * - Recovery: passive (on getState check) vs active (setTimeout)
 * - API: execute(instanceId, fn) vs execute(fn)
 * - Retry: none vs executeWithRetry
 * - Cleanup: none vs destroy()
 *
 * ## Unified API Requirements:
 *
 * The consolidated circuit breaker should:
 * 1. Support both single-instance and multi-instance modes
 * 2. Use string literal union for better TypeScript inference
 * 3. Have a single CircuitOpenError class in shared/errors.ts
 * 4. Support both passive and active recovery
 * 5. Include retry functionality
 * 6. Have proper cleanup/destroy method
 * 7. Be generic enough for CDC, routing, and DO use cases
 */
export {};
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