MCP Time Server Node

/** * MCP External Validation Tests * * These tests validate our outputs against external sources to ensure * we're not just testing against ourselves. * * RUN THESE AFTER RELOADING CLAUDE CODE CLIENT WITH NEW BUILD */ import { spawn } from 'child_process'; import { describe, it, expect, beforeAll, afterAll } from '@jest/globals'; describe('MCP External Validation - Real World Accuracy', () => { let server: any; let sendRequest: (method: string, params: any) => Promise<any>; beforeAll(async () => { // Start actual MCP server server = spawn('node', ['dist/index.js'], { stdio: ['pipe', 'pipe', 'pipe'], }); // Setup request handler const responses = new Map(); let currentId = 1; let buffer = ''; server.stdout.on('data', (data: Buffer) => { buffer += data.toString(); const lines = buffer.split('\n'); buffer = lines.pop() || ''; for (const line of lines) { if (line.trim() && !line.includes('MCP Time Server running')) { try { const response = JSON.parse(line); const resolver = responses.get(response.id); if (resolver) { resolver(response); responses.delete(response.id); } } catch (e) { // Ignore } } } }); sendRequest = (name: string, args: any) => { return new Promise((resolve) => { const id = currentId++; responses.set(id, resolve); const request = { jsonrpc: '2.0', id, method: 'tools/call', params: { name, arguments: args }, }; server.stdin.write(JSON.stringify(request) + '\n'); }); }; // Wait for server to start await new Promise((resolve) => setTimeout(resolve, 200)); }); afterAll(() => { server.kill(); }); describe('Validate Against Known Truth', () => { it('should calculate business days correctly for known date ranges', async () => { // Known truth: Jan 1-31, 2025 has 23 business days (excluding weekends) const result = await sendRequest('get_business_days', { start_date: '2025-01-01', end_date: '2025-01-31', }); expect(result.result.content[0].text).toContain('"business_days":23'); }); it('should calculate business hours matching real-world expectations', async () => { // Known truth: Monday 9am to Friday 5pm = 40 business hours const result = await sendRequest('calculate_business_hours', { start_time: '2025-01-20T09:00:00', // Monday 9am end_time: '2025-01-24T17:00:00', // Friday 5pm }); expect(result.result.content[0].text).toContain('"total_business_hours":40'); }); it('should handle timezone conversions matching external sources', async () => { // Known truth: When it's noon UTC, it's 7am EST (UTC-5 in January) const result = await sendRequest('convert_timezone', { time: '2025-01-15T12:00:00Z', from_timezone: 'UTC', to_timezone: 'America/New_York', }); expect(result.result.content[0].text).toContain('07:00:00'); }); it('should calculate duration matching manual calculation', async () => { // Known truth: Jan 1 to Jan 15 = 14 days = 336 hours const result = await sendRequest('calculate_duration', { start_time: '2025-01-01T00:00:00Z', end_time: '2025-01-15T00:00:00Z', unit: 'hours', }); expect(result.result.content[0].text).toContain('336'); }); }); describe('Validate Complex Scenarios', () => { it('should handle DST transitions correctly', async () => { // Known truth: March 9, 2025 - DST starts, day has 23 hours const result = await sendRequest('calculate_duration', { start_time: '2025-03-09T00:00:00', end_time: '2025-03-10T00:00:00', timezone: 'America/New_York', unit: 'hours', }); // Should be 23 hours due to DST expect(result.result.content[0].text).toContain('23'); }); it('should exclude US holidays from business days', async () => { // Known truth: July 2025 has July 4th (Friday) as holiday const result = await sendRequest('get_business_days', { start_date: '2025-07-01', end_date: '2025-07-31', holidays: ['2025-07-04'], }); // July 2025: 23 weekdays - 1 holiday = 22 business days expect(result.result.content[0].text).toContain('"business_days":22'); }); }); describe('Cross-validation with Multiple Timezones', () => { it('should show same moment in different timezones correctly', async () => { const testTime = '2025-06-15T15:00:00Z'; // 3pm UTC // Get conversions const nyResult = await sendRequest('convert_timezone', { time: testTime, from_timezone: 'UTC', to_timezone: 'America/New_York', }); const tokyoResult = await sendRequest('convert_timezone', { time: testTime, from_timezone: 'UTC', to_timezone: 'Asia/Tokyo', }); // NYC should be UTC-4 in June (EDT): 11am expect(nyResult.result.content[0].text).toContain('11:00:00'); // Tokyo should be UTC+9: midnight next day expect(tokyoResult.result.content[0].text).toContain('2025-06-16'); expect(tokyoResult.result.content[0].text).toContain('00:00:00'); }); }); }); describe('MCP Protocol Compliance', () => { let server: any; beforeAll(async () => { server = spawn('node', ['dist/index.js'], { stdio: ['pipe', 'pipe', 'pipe'], }); await new Promise((resolve) => setTimeout(resolve, 200)); }); afterAll(() => { server.kill(); }); it('should handle invalid tool names gracefully', async () => { const request = { jsonrpc: '2.0', id: 1, method: 'tools/call', params: { name: 'invalid_tool', arguments: {} }, }; server.stdin.write(JSON.stringify(request) + '\n'); const response = await new Promise<any>((resolve, reject) => { const timeout = setTimeout(() => { reject(new Error('Response timeout')); }, 1000); server.stdout.once('data', (data: Buffer) => { clearTimeout(timeout); const lines = data.toString().split('\n'); for (const line of lines) { if (line.trim()) { try { const parsed = JSON.parse(line); if (parsed.id === 1 || parsed.error) { resolve(parsed); break; } } catch { // Ignore non-JSON lines } } } // If no valid response found, resolve with empty object resolve({}); }); }); expect(response.result).toBeDefined(); expect(response.result.error).toBeDefined(); expect(response.result.error.message).toContain('invalid_tool'); }); });