integration test placeholders

tests/integration/health/README.md

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+# Health Integration Tests
+
+This directory contains integration tests for health-related functionality in the GridPilot project.
+
+## Purpose
+
+These tests verify the **orchestration logic** of health-related Use Cases and their interactions with Ports using **In-Memory adapters**. They focus on business logic, not UI rendering.
+
+## Test Structure
+
+### 1. API Connection Monitor Tests (`api-connection-monitor.integration.test.ts`)
+
+Tests the `ApiConnectionMonitor` class which handles:
+- **Health check execution**: Performing HTTP health checks against API endpoints
+- **Connection status tracking**: Managing connection states (connected, degraded, disconnected, checking)
+- **Metrics calculation**: Tracking success/failure rates, response times, and reliability
+- **Event emission**: Emitting events for status changes and health check results
+
+**Key Scenarios:**
+- Successful health checks with varying response times
+- Failed health checks (network errors, timeouts)
+- Connection status transitions (disconnected → connected, connected → degraded)
+- Reliability and average response time calculations
+- Multiple endpoint fallback strategies
+- Event emission patterns
+
+### 2. Health Check Use Cases Tests (`health-check-use-cases.integration.test.ts`)
+
+Tests the health-related Use Cases:
+- **CheckApiHealthUseCase**: Executes health checks and returns status
+- **GetConnectionStatusUseCase**: Retrieves current connection status and metrics
+
+**Key Scenarios:**
+- Successful health check execution
+- Failed health check handling
+- Connection status retrieval (connected, degraded, disconnected, checking)
+- Metrics calculation and formatting
+- Event emission for status changes
+- Error handling and validation
+
+## Testing Philosophy
+
+These tests follow the **Clean Integration Strategy**:
+
+1. **Focus on Use Case Orchestration**: Tests verify how Use Cases interact with their Ports (Repositories, Adapters, Event Publishers)
+2. **In-Memory Adapters**: Use in-memory implementations for speed and determinism
+3. **Business Logic Only**: Tests verify business logic, not UI rendering or external dependencies
+4. **Given/When/Then Structure**: Clear test scenarios with explicit preconditions and expected outcomes
+
+## Test Categories
+
+### Success Path Tests
+- Verify correct behavior when all operations succeed
+- Test with various data scenarios (minimal data, complete data, edge cases)
+
+### Failure Path Tests
+- Verify error handling for network failures
+- Test timeout scenarios
+- Handle malformed responses
+
+### Edge Case Tests
+- Empty or missing data
+- Concurrent operations
+- Invalid inputs
+
+### Metrics Calculation Tests
+- Reliability percentage calculation
+- Average response time calculation
+- Status transition logic
+
+## Running Tests
+
+```bash
+# Run all health integration tests
+npm test -- tests/integration/health/
+
+# Run specific test file
+npm test -- tests/integration/health/api-connection-monitor.integration.test.ts
+```
+
+## Implementation Notes
+
+These are **placeholder tests** with TODO comments. They define the test structure and scenarios but do not contain actual implementation. When implementing:
+
+1. Create the necessary In-Memory adapters in `adapters/health/persistence/inmemory/`
+2. Create the Use Cases in `core/health/use-cases/`
+3. Create the Ports in `core/health/ports/`
+4. Implement the test logic following the Given/When/Then patterns defined in each test
+
+## Related Documentation
+
+- [Clean Integration Strategy](../../../plans/clean_integration_strategy.md)
+- [Integration Test Pattern](../README.md)
+- [BDD E2E Tests](../../e2e/bdd/health/)

tests/integration/health/api-connection-monitor.integration.test.ts

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+/**
+ * Integration Test: API Connection Monitor Health Checks
+ * 
+ * Tests the orchestration logic of API connection health monitoring:
+ * - ApiConnectionMonitor: Tracks connection status, performs health checks, records metrics
+ * - Validates that health monitoring correctly interacts with its Ports (API endpoints, event emitters)
+ * - Uses In-Memory adapters for fast, deterministic testing
+ * 
+ * Focus: Business logic orchestration, NOT UI rendering
+ */
+
+import { describe, it, expect, beforeAll, afterAll, beforeEach, vi } from 'vitest';
+import { InMemoryHealthCheckAdapter } from '../../../adapters/health/persistence/inmemory/InMemoryHealthCheckAdapter';
+import { InMemoryEventPublisher } from '../../../adapters/events/InMemoryEventPublisher';
+import { ApiConnectionMonitor } from '../../../apps/website/lib/api/base/ApiConnectionMonitor';
+
+describe('API Connection Monitor Health Orchestration', () => {
+  let healthCheckAdapter: InMemoryHealthCheckAdapter;
+  let eventPublisher: InMemoryEventPublisher;
+  let apiConnectionMonitor: ApiConnectionMonitor;
+
+  beforeAll(() => {
+    // TODO: Initialize In-Memory health check adapter and event publisher
+    // healthCheckAdapter = new InMemoryHealthCheckAdapter();
+    // eventPublisher = new InMemoryEventPublisher();
+    // apiConnectionMonitor = new ApiConnectionMonitor('/health');
+  });
+
+  beforeEach(() => {
+    // TODO: Clear all In-Memory repositories before each test
+    // healthCheckAdapter.clear();
+    // eventPublisher.clear();
+  });
+
+  describe('PerformHealthCheck - Success Path', () => {
+    it('should perform successful health check and record metrics', async () => {
+      // TODO: Implement test
+      // Scenario: API is healthy and responsive
+      // Given: HealthCheckAdapter returns successful response
+      // And: Response time is 50ms
+      // When: performHealthCheck() is called
+      // Then: Health check result should show healthy=true
+      // And: Response time should be recorded
+      // And: EventPublisher should emit HealthCheckCompletedEvent
+      // And: Connection status should be 'connected'
+    });
+
+    it('should perform health check with slow response time', async () => {
+      // TODO: Implement test
+      // Scenario: API is healthy but slow
+      // Given: HealthCheckAdapter returns successful response
+      // And: Response time is 500ms
+      // When: performHealthCheck() is called
+      // Then: Health check result should show healthy=true
+      // And: Response time should be recorded as 500ms
+      // And: EventPublisher should emit HealthCheckCompletedEvent
+    });
+
+    it('should handle multiple successful health checks', async () => {
+      // TODO: Implement test
+      // Scenario: Multiple consecutive successful health checks
+      // Given: HealthCheckAdapter returns successful responses
+      // When: performHealthCheck() is called 3 times
+      // Then: All health checks should show healthy=true
+      // And: Total requests should be 3
+      // And: Successful requests should be 3
+      // And: Failed requests should be 0
+      // And: Average response time should be calculated
+    });
+  });
+
+  describe('PerformHealthCheck - Failure Path', () => {
+    it('should handle failed health check and record failure', async () => {
+      // TODO: Implement test
+      // Scenario: API is unreachable
+      // Given: HealthCheckAdapter throws network error
+      // When: performHealthCheck() is called
+      // Then: Health check result should show healthy=false
+      // And: EventPublisher should emit HealthCheckFailedEvent
+      // And: Connection status should be 'disconnected'
+      // And: Consecutive failures should be 1
+    });
+
+    it('should handle multiple consecutive failures', async () => {
+      // TODO: Implement test
+      // Scenario: API is down for multiple checks
+      // Given: HealthCheckAdapter throws errors 3 times
+      // When: performHealthCheck() is called 3 times
+      // Then: All health checks should show healthy=false
+      // And: Total requests should be 3
+      // And: Failed requests should be 3
+      // And: Consecutive failures should be 3
+      // And: Connection status should be 'disconnected'
+    });
+
+    it('should handle timeout during health check', async () => {
+      // TODO: Implement test
+      // Scenario: Health check times out
+      // Given: HealthCheckAdapter times out after 30 seconds
+      // When: performHealthCheck() is called
+      // Then: Health check result should show healthy=false
+      // And: EventPublisher should emit HealthCheckTimeoutEvent
+      // And: Consecutive failures should increment
+    });
+  });
+
+  describe('Connection Status Management', () => {
+    it('should transition from disconnected to connected after recovery', async () => {
+      // TODO: Implement test
+      // Scenario: API recovers from outage
+      // Given: Initial state is disconnected with 3 consecutive failures
+      // And: HealthCheckAdapter starts returning success
+      // When: performHealthCheck() is called
+      // Then: Connection status should transition to 'connected'
+      // And: Consecutive failures should reset to 0
+      // And: EventPublisher should emit ConnectedEvent
+    });
+
+    it('should degrade status when reliability drops below threshold', async () => {
+      // TODO: Implement test
+      // Scenario: API has intermittent failures
+      // Given: 5 successful requests followed by 3 failures
+      // When: performHealthCheck() is called for each
+      // Then: Connection status should be 'degraded'
+      // And: Reliability should be calculated correctly (5/8 = 62.5%)
+    });
+
+    it('should handle checking status when no requests yet', async () => {
+      // TODO: Implement test
+      // Scenario: Monitor just started
+      // Given: No health checks performed yet
+      // When: getStatus() is called
+      // Then: Status should be 'checking'
+      // And: isAvailable() should return false
+    });
+  });
+
+  describe('Health Metrics Calculation', () => {
+    it('should correctly calculate reliability percentage', async () => {
+      // TODO: Implement test
+      // Scenario: Calculate reliability from mixed results
+      // Given: 7 successful requests and 3 failed requests
+      // When: getReliability() is called
+      // Then: Reliability should be 70%
+    });
+
+    it('should correctly calculate average response time', async () => {
+      // TODO: Implement test
+      // Scenario: Calculate average from varying response times
+      // Given: Response times of 50ms, 100ms, 150ms
+      // When: getHealth() is called
+      // Then: Average response time should be 100ms
+    });
+
+    it('should handle zero requests for reliability calculation', async () => {
+      // TODO: Implement test
+      // Scenario: No requests made yet
+      // Given: No health checks performed
+      // When: getReliability() is called
+      // Then: Reliability should be 0
+    });
+  });
+
+  describe('Health Check Endpoint Selection', () => {
+    it('should try multiple endpoints when primary fails', async () => {
+      // TODO: Implement test
+      // Scenario: Primary endpoint fails, fallback succeeds
+      // Given: /health endpoint fails
+      // And: /api/health endpoint succeeds
+      // When: performHealthCheck() is called
+      // Then: Should try /health first
+      // And: Should fall back to /api/health
+      // And: Health check should be successful
+    });
+
+    it('should handle all endpoints being unavailable', async () => {
+      // TODO: Implement test
+      // Scenario: All health endpoints are down
+      // Given: /health, /api/health, and /status all fail
+      // When: performHealthCheck() is called
+      // Then: Health check should show healthy=false
+      // And: Should record failure for all attempted endpoints
+    });
+  });
+
+  describe('Event Emission Patterns', () => {
+    it('should emit connected event when transitioning to connected', async () => {
+      // TODO: Implement test
+      // Scenario: Successful health check after disconnection
+      // Given: Current status is disconnected
+      // And: HealthCheckAdapter returns success
+      // When: performHealthCheck() is called
+      // Then: EventPublisher should emit ConnectedEvent
+      // And: Event should include timestamp and response time
+    });
+
+    it('should emit disconnected event when threshold exceeded', async () => {
+      // TODO: Implement test
+      // Scenario: Consecutive failures reach threshold
+      // Given: 2 consecutive failures
+      // And: Third failure occurs
+      // When: performHealthCheck() is called
+      // Then: EventPublisher should emit DisconnectedEvent
+      // And: Event should include failure count
+    });
+
+    it('should emit degraded event when reliability drops', async () => {
+      // TODO: Implement test
+      // Scenario: Reliability drops below threshold
+      // Given: 5 successful, 3 failed requests (62.5% reliability)
+      // When: performHealthCheck() is called
+      // Then: EventPublisher should emit DegradedEvent
+      // And: Event should include current reliability percentage
+    });
+  });
+
+  describe('Error Handling', () => {
+    it('should handle network errors gracefully', async () => {
+      // TODO: Implement test
+      // Scenario: Network error during health check
+      // Given: HealthCheckAdapter throws ECONNREFUSED
+      // When: performHealthCheck() is called
+      // Then: Should not throw unhandled error
+      // And: Should record failure
+      // And: Should maintain connection status
+    });
+
+    it('should handle malformed response from health endpoint', async () => {
+      // TODO: Implement test
+      // Scenario: Health endpoint returns invalid JSON
+      // Given: HealthCheckAdapter returns malformed response
+      // When: performHealthCheck() is called
+      // Then: Should handle parsing error
+      // And: Should record as failed check
+      // And: Should emit appropriate error event
+    });
+
+    it('should handle concurrent health check calls', async () => {
+      // TODO: Implement test
+      // Scenario: Multiple simultaneous health checks
+      // Given: performHealthCheck() is already running
+      // When: performHealthCheck() is called again
+      // Then: Should return existing check result
+      // And: Should not start duplicate checks
+    });
+  });
+});

tests/integration/health/health-check-use-cases.integration.test.ts

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+/**
+ * Integration Test: Health Check Use Case Orchestration
+ * 
+ * Tests the orchestration logic of health check-related Use Cases:
+ * - CheckApiHealthUseCase: Executes health checks and returns status
+ * - GetConnectionStatusUseCase: Retrieves current connection status
+ * - Validates that Use Cases correctly interact with their Ports (Health Check Adapter, Event Publisher)
+ * - Uses In-Memory adapters for fast, deterministic testing
+ * 
+ * Focus: Business logic orchestration, NOT UI rendering
+ */
+
+import { describe, it, expect, beforeAll, afterAll, beforeEach } from 'vitest';
+import { InMemoryHealthCheckAdapter } from '../../../adapters/health/persistence/inmemory/InMemoryHealthCheckAdapter';
+import { InMemoryEventPublisher } from '../../../adapters/events/InMemoryEventPublisher';
+import { CheckApiHealthUseCase } from '../../../core/health/use-cases/CheckApiHealthUseCase';
+import { GetConnectionStatusUseCase } from '../../../core/health/use-cases/GetConnectionStatusUseCase';
+import { HealthCheckQuery } from '../../../core/health/ports/HealthCheckQuery';
+
+describe('Health Check Use Case Orchestration', () => {
+  let healthCheckAdapter: InMemoryHealthCheckAdapter;
+  let eventPublisher: InMemoryEventPublisher;
+  let checkApiHealthUseCase: CheckApiHealthUseCase;
+  let getConnectionStatusUseCase: GetConnectionStatusUseCase;
+
+  beforeAll(() => {
+    // TODO: Initialize In-Memory adapters and event publisher
+    // healthCheckAdapter = new InMemoryHealthCheckAdapter();
+    // eventPublisher = new InMemoryEventPublisher();
+    // checkApiHealthUseCase = new CheckApiHealthUseCase({
+    //   healthCheckAdapter,
+    //   eventPublisher,
+    // });
+    // getConnectionStatusUseCase = new GetConnectionStatusUseCase({
+    //   healthCheckAdapter,
+    // });
+  });
+
+  beforeEach(() => {
+    // TODO: Clear all In-Memory repositories before each test
+    // healthCheckAdapter.clear();
+    // eventPublisher.clear();
+  });
+
+  describe('CheckApiHealthUseCase - Success Path', () => {
+    it('should perform health check and return healthy status', async () => {
+      // TODO: Implement test
+      // Scenario: API is healthy and responsive
+      // Given: HealthCheckAdapter returns successful response
+      // And: Response time is 50ms
+      // When: CheckApiHealthUseCase.execute() is called
+      // Then: Result should show healthy=true
+      // And: Response time should be 50ms
+      // And: Timestamp should be present
+      // And: EventPublisher should emit HealthCheckCompletedEvent
+    });
+
+    it('should perform health check with slow response time', async () => {
+      // TODO: Implement test
+      // Scenario: API is healthy but slow
+      // Given: HealthCheckAdapter returns successful response
+      // And: Response time is 500ms
+      // When: CheckApiHealthUseCase.execute() is called
+      // Then: Result should show healthy=true
+      // And: Response time should be 500ms
+      // And: EventPublisher should emit HealthCheckCompletedEvent
+    });
+
+    it('should handle health check with custom endpoint', async () => {
+      // TODO: Implement test
+      // Scenario: Health check on custom endpoint
+      // Given: HealthCheckAdapter returns success for /custom/health
+      // When: CheckApiHealthUseCase.execute() is called with custom endpoint
+      // Then: Result should show healthy=true
+      // And: Should use the custom endpoint
+    });
+  });
+
+  describe('CheckApiHealthUseCase - Failure Path', () => {
+    it('should handle failed health check and return unhealthy status', async () => {
+      // TODO: Implement test
+      // Scenario: API is unreachable
+      // Given: HealthCheckAdapter throws network error
+      // When: CheckApiHealthUseCase.execute() is called
+      // Then: Result should show healthy=false
+      // And: Error message should be present
+      // And: EventPublisher should emit HealthCheckFailedEvent
+    });
+
+    it('should handle timeout during health check', async () => {
+      // TODO: Implement test
+      // Scenario: Health check times out
+      // Given: HealthCheckAdapter times out after 30 seconds
+      // When: CheckApiHealthUseCase.execute() is called
+      // Then: Result should show healthy=false
+      // And: Error should indicate timeout
+      // And: EventPublisher should emit HealthCheckTimeoutEvent
+    });
+
+    it('should handle malformed response from health endpoint', async () => {
+      // TODO: Implement test
+      // Scenario: Health endpoint returns invalid JSON
+      // Given: HealthCheckAdapter returns malformed response
+      // When: CheckApiHealthUseCase.execute() is called
+      // Then: Result should show healthy=false
+      // And: Error should indicate parsing failure
+      // And: EventPublisher should emit HealthCheckFailedEvent
+    });
+  });
+
+  describe('GetConnectionStatusUseCase - Success Path', () => {
+    it('should retrieve connection status when healthy', async () => {
+      // TODO: Implement test
+      // Scenario: Connection is healthy
+      // Given: HealthCheckAdapter has successful checks
+      // And: Connection status is 'connected'
+      // When: GetConnectionStatusUseCase.execute() is called
+      // Then: Result should show status='connected'
+      // And: Reliability should be 100%
+      // And: Last check timestamp should be present
+    });
+
+    it('should retrieve connection status when degraded', async () => {
+      // TODO: Implement test
+      // Scenario: Connection is degraded
+      // Given: HealthCheckAdapter has mixed results (5 success, 3 fail)
+      // And: Connection status is 'degraded'
+      // When: GetConnectionStatusUseCase.execute() is called
+      // Then: Result should show status='degraded'
+      // And: Reliability should be 62.5%
+      // And: Consecutive failures should be 0
+    });
+
+    it('should retrieve connection status when disconnected', async () => {
+      // TODO: Implement test
+      // Scenario: Connection is disconnected
+      // Given: HealthCheckAdapter has 3 consecutive failures
+      // And: Connection status is 'disconnected'
+      // When: GetConnectionStatusUseCase.execute() is called
+      // Then: Result should show status='disconnected'
+      // And: Consecutive failures should be 3
+      // And: Last failure timestamp should be present
+    });
+
+    it('should retrieve connection status when checking', async () => {
+      // TODO: Implement test
+      // Scenario: Connection status is checking
+      // Given: No health checks performed yet
+      // And: Connection status is 'checking'
+      // When: GetConnectionStatusUseCase.execute() is called
+      // Then: Result should show status='checking'
+      // And: Reliability should be 0
+    });
+  });
+
+  describe('GetConnectionStatusUseCase - Metrics', () => {
+    it('should calculate reliability correctly', async () => {
+      // TODO: Implement test
+      // Scenario: Calculate reliability from mixed results
+      // Given: 7 successful requests and 3 failed requests
+      // When: GetConnectionStatusUseCase.execute() is called
+      // Then: Result should show reliability=70%
+      // And: Total requests should be 10
+      // And: Successful requests should be 7
+      // And: Failed requests should be 3
+    });
+
+    it('should calculate average response time correctly', async () => {
+      // TODO: Implement test
+      // Scenario: Calculate average from varying response times
+      // Given: Response times of 50ms, 100ms, 150ms
+      // When: GetConnectionStatusUseCase.execute() is called
+      // Then: Result should show averageResponseTime=100ms
+    });
+
+    it('should handle zero requests for metrics calculation', async () => {
+      // TODO: Implement test
+      // Scenario: No requests made yet
+      // Given: No health checks performed
+      // When: GetConnectionStatusUseCase.execute() is called
+      // Then: Result should show reliability=0
+      // And: Average response time should be 0
+      // And: Total requests should be 0
+    });
+  });
+
+  describe('Health Check Data Orchestration', () => {
+    it('should correctly format health check result with all fields', async () => {
+      // TODO: Implement test
+      // Scenario: Complete health check result
+      // Given: HealthCheckAdapter returns successful response
+      // And: Response time is 75ms
+      // When: CheckApiHealthUseCase.execute() is called
+      // Then: Result should contain:
+      // - healthy: true
+      // - responseTime: 75
+      // - timestamp: (current timestamp)
+      // - endpoint: '/health'
+      // - error: undefined
+    });
+
+    it('should correctly format connection status with all fields', async () => {
+      // TODO: Implement test
+      // Scenario: Complete connection status
+      // Given: HealthCheckAdapter has 5 success, 3 fail
+      // When: GetConnectionStatusUseCase.execute() is called
+      // Then: Result should contain:
+      // - status: 'degraded'
+      // - reliability: 62.5
+      // - totalRequests: 8
+      // - successfulRequests: 5
+      // - failedRequests: 3
+      // - consecutiveFailures: 0
+      // - averageResponseTime: (calculated)
+      // - lastCheck: (timestamp)
+      // - lastSuccess: (timestamp)
+      // - lastFailure: (timestamp)
+    });
+
+    it('should correctly format connection status when disconnected', async () => {
+      // TODO: Implement test
+      // Scenario: Connection is disconnected
+      // Given: HealthCheckAdapter has 3 consecutive failures
+      // When: GetConnectionStatusUseCase.execute() is called
+      // Then: Result should contain:
+      // - status: 'disconnected'
+      // - consecutiveFailures: 3
+      // - lastFailure: (timestamp)
+      // - lastSuccess: (timestamp from before failures)
+    });
+  });
+
+  describe('Event Emission Patterns', () => {
+    it('should emit HealthCheckCompletedEvent on successful check', async () => {
+      // TODO: Implement test
+      // Scenario: Successful health check
+      // Given: HealthCheckAdapter returns success
+      // When: CheckApiHealthUseCase.execute() is called
+      // Then: EventPublisher should emit HealthCheckCompletedEvent
+      // And: Event should include health check result
+    });
+
+    it('should emit HealthCheckFailedEvent on failed check', async () => {
+      // TODO: Implement test
+      // Scenario: Failed health check
+      // Given: HealthCheckAdapter throws error
+      // When: CheckApiHealthUseCase.execute() is called
+      // Then: EventPublisher should emit HealthCheckFailedEvent
+      // And: Event should include error details
+    });
+
+    it('should emit ConnectionStatusChangedEvent on status change', async () => {
+      // TODO: Implement test
+      // Scenario: Connection status changes
+      // Given: Current status is 'disconnected'
+      // And: HealthCheckAdapter returns success
+      // When: CheckApiHealthUseCase.execute() is called
+      // Then: EventPublisher should emit ConnectionStatusChangedEvent
+      // And: Event should include old and new status
+    });
+  });
+
+  describe('Error Handling', () => {
+    it('should handle adapter errors gracefully', async () => {
+      // TODO: Implement test
+      // Scenario: HealthCheckAdapter throws unexpected error
+      // Given: HealthCheckAdapter throws generic error
+      // When: CheckApiHealthUseCase.execute() is called
+      // Then: Should not throw unhandled error
+      // And: Should return unhealthy status
+      // And: Should include error message
+    });
+
+    it('should handle invalid endpoint configuration', async () => {
+      // TODO: Implement test
+      // Scenario: Invalid endpoint provided
+      // Given: Invalid endpoint string
+      // When: CheckApiHealthUseCase.execute() is called
+      // Then: Should handle validation error
+      // And: Should return error status
+    });
+
+    it('should handle concurrent health check calls', async () => {
+      // TODO: Implement test
+      // Scenario: Multiple simultaneous health checks
+      // Given: CheckApiHealthUseCase.execute() is already running
+      // When: CheckApiHealthUseCase.execute() is called again
+      // Then: Should return existing result
+      // And: Should not start duplicate checks
+    });
+  });
+});