adapter tests

adapters/health/persistence/inmemory/InMemoryHealthCheckAdapter.test.ts

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+import { InMemoryHealthCheckAdapter } from './InMemoryHealthCheckAdapter';
+
+describe('InMemoryHealthCheckAdapter', () => {
+  let adapter: InMemoryHealthCheckAdapter;
+
+  beforeEach(() => {
+    adapter = new InMemoryHealthCheckAdapter();
+    adapter.setResponseTime(0); // Speed up tests
+  });
+
+  describe('Health Checks', () => {
+    it('should return healthy by default', async () => {
+      // When
+      const result = await adapter.performHealthCheck();
+
+      // Then
+      expect(result.healthy).toBe(true);
+      expect(adapter.getStatus()).toBe('connected');
+    });
+
+    it('should return unhealthy when configured to fail', async () => {
+      // Given
+      adapter.setShouldFail(true, 'Custom error');
+
+      // When
+      const result = await adapter.performHealthCheck();
+
+      // Then
+      expect(result.healthy).toBe(false);
+      expect(result.error).toBe('Custom error');
+    });
+  });
+
+  describe('Status Transitions', () => {
+    it('should transition to disconnected after 3 consecutive failures', async () => {
+      // Given
+      adapter.setShouldFail(true);
+
+      // When
+      await adapter.performHealthCheck(); // 1
+      expect(adapter.getStatus()).toBe('checking'); // Initial state is disconnected, first failure keeps it checking/disconnected
+      
+      await adapter.performHealthCheck(); // 2
+      await adapter.performHealthCheck(); // 3
+
+      // Then
+      expect(adapter.getStatus()).toBe('disconnected');
+    });
+
+    it('should transition to degraded if reliability is low', async () => {
+      // Given
+      // We need 5 requests total, and reliability < 0.7
+      // 1 success, 4 failures (not consecutive)
+      
+      await adapter.performHealthCheck(); // Success 1
+      
+      adapter.setShouldFail(true);
+      await adapter.performHealthCheck(); // Failure 1
+      adapter.setShouldFail(false);
+      await adapter.performHealthCheck(); // Success 2 (resets consecutive)
+      adapter.setShouldFail(true);
+      await adapter.performHealthCheck(); // Failure 2
+      await adapter.performHealthCheck(); // Failure 3
+      adapter.setShouldFail(false);
+      await adapter.performHealthCheck(); // Success 3 (resets consecutive)
+      adapter.setShouldFail(true);
+      await adapter.performHealthCheck(); // Failure 4
+      await adapter.performHealthCheck(); // Failure 5
+
+      // Then
+      expect(adapter.getStatus()).toBe('degraded');
+      expect(adapter.getReliability()).toBeLessThan(70);
+    });
+
+    it('should recover status after a success', async () => {
+      // Given
+      adapter.setShouldFail(true);
+      await adapter.performHealthCheck();
+      await adapter.performHealthCheck();
+      await adapter.performHealthCheck();
+      expect(adapter.getStatus()).toBe('disconnected');
+
+      // When
+      adapter.setShouldFail(false);
+      await adapter.performHealthCheck();
+
+      // Then
+      expect(adapter.getStatus()).toBe('connected');
+      expect(adapter.isAvailable()).toBe(true);
+    });
+  });
+
+  describe('Metrics', () => {
+    it('should track average response time', async () => {
+      // Given
+      adapter.setResponseTime(10);
+      await adapter.performHealthCheck();
+      
+      adapter.setResponseTime(20);
+      await adapter.performHealthCheck();
+
+      // Then
+      const health = adapter.getHealth();
+      expect(health.averageResponseTime).toBe(15);
+      expect(health.totalRequests).toBe(2);
+    });
+  });
+
+  describe('Maintenance', () => {
+    it('should clear state', async () => {
+      // Given
+      await adapter.performHealthCheck();
+      expect(adapter.getHealth().totalRequests).toBe(1);
+
+      // When
+      adapter.clear();
+
+      // Then
+      expect(adapter.getHealth().totalRequests).toBe(0);
+      expect(adapter.getStatus()).toBe('disconnected'); // Initial state
+    });
+  });
+});