integration tests

adapters/events/InMemoryHealthEventPublisher.ts

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+/**
+ * In-Memory Health Event Publisher
+ *
+ * Tracks health-related events for testing purposes.
+ * This publisher allows verification of event emission patterns
+ * without requiring external event bus infrastructure.
+ */
+
+import {
+  HealthEventPublisher,
+  HealthCheckCompletedEvent,
+  HealthCheckFailedEvent,
+  HealthCheckTimeoutEvent,
+  ConnectedEvent,
+  DisconnectedEvent,
+  DegradedEvent,
+  CheckingEvent,
+} from '../../../core/health/ports/HealthEventPublisher';
+
+export interface HealthCheckCompletedEventWithType {
+  type: 'HealthCheckCompleted';
+  healthy: boolean;
+  responseTime: number;
+  timestamp: Date;
+  endpoint?: string;
+}
+
+export interface HealthCheckFailedEventWithType {
+  type: 'HealthCheckFailed';
+  error: string;
+  timestamp: Date;
+  endpoint?: string;
+}
+
+export interface HealthCheckTimeoutEventWithType {
+  type: 'HealthCheckTimeout';
+  timestamp: Date;
+  endpoint?: string;
+}
+
+export interface ConnectedEventWithType {
+  type: 'Connected';
+  timestamp: Date;
+  responseTime: number;
+}
+
+export interface DisconnectedEventWithType {
+  type: 'Disconnected';
+  timestamp: Date;
+  consecutiveFailures: number;
+}
+
+export interface DegradedEventWithType {
+  type: 'Degraded';
+  timestamp: Date;
+  reliability: number;
+}
+
+export interface CheckingEventWithType {
+  type: 'Checking';
+  timestamp: Date;
+}
+
+export type HealthEvent =
+  | HealthCheckCompletedEventWithType
+  | HealthCheckFailedEventWithType
+  | HealthCheckTimeoutEventWithType
+  | ConnectedEventWithType
+  | DisconnectedEventWithType
+  | DegradedEventWithType
+  | CheckingEventWithType;
+
+export class InMemoryHealthEventPublisher implements HealthEventPublisher {
+  private events: HealthEvent[] = [];
+  private shouldFail: boolean = false;
+
+  /**
+   * Publish a health check completed event
+   */
+  async publishHealthCheckCompleted(event: HealthCheckCompletedEvent): Promise<void> {
+    if (this.shouldFail) throw new Error('Event publisher failed');
+    this.events.push({ type: 'HealthCheckCompleted', ...event });
+  }
+
+  /**
+   * Publish a health check failed event
+   */
+  async publishHealthCheckFailed(event: HealthCheckFailedEvent): Promise<void> {
+    if (this.shouldFail) throw new Error('Event publisher failed');
+    this.events.push({ type: 'HealthCheckFailed', ...event });
+  }
+
+  /**
+   * Publish a health check timeout event
+   */
+  async publishHealthCheckTimeout(event: HealthCheckTimeoutEvent): Promise<void> {
+    if (this.shouldFail) throw new Error('Event publisher failed');
+    this.events.push({ type: 'HealthCheckTimeout', ...event });
+  }
+
+  /**
+   * Publish a connected event
+   */
+  async publishConnected(event: ConnectedEvent): Promise<void> {
+    if (this.shouldFail) throw new Error('Event publisher failed');
+    this.events.push({ type: 'Connected', ...event });
+  }
+
+  /**
+   * Publish a disconnected event
+   */
+  async publishDisconnected(event: DisconnectedEvent): Promise<void> {
+    if (this.shouldFail) throw new Error('Event publisher failed');
+    this.events.push({ type: 'Disconnected', ...event });
+  }
+
+  /**
+   * Publish a degraded event
+   */
+  async publishDegraded(event: DegradedEvent): Promise<void> {
+    if (this.shouldFail) throw new Error('Event publisher failed');
+    this.events.push({ type: 'Degraded', ...event });
+  }
+
+  /**
+   * Publish a checking event
+   */
+  async publishChecking(event: CheckingEvent): Promise<void> {
+    if (this.shouldFail) throw new Error('Event publisher failed');
+    this.events.push({ type: 'Checking', ...event });
+  }
+
+  /**
+   * Get all published events
+   */
+  getEvents(): HealthEvent[] {
+    return [...this.events];
+  }
+
+  /**
+   * Get events by type
+   */
+  getEventsByType<T extends HealthEvent['type']>(type: T): Extract<HealthEvent, { type: T }>[] {
+    return this.events.filter((event): event is Extract<HealthEvent, { type: T }> => event.type === type);
+  }
+
+  /**
+   * Get the count of events
+   */
+  getEventCount(): number {
+    return this.events.length;
+  }
+
+  /**
+   * Get the count of events by type
+   */
+  getEventCountByType(type: HealthEvent['type']): number {
+    return this.events.filter(event => event.type === type).length;
+  }
+
+  /**
+   * Clear all published events
+   */
+  clear(): void {
+    this.events = [];
+    this.shouldFail = false;
+  }
+
+  /**
+   * Configure the publisher to fail on publish
+   */
+  setShouldFail(shouldFail: boolean): void {
+    this.shouldFail = shouldFail;
+  }
+}