import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { spawn } from 'node:child_process';
import { request } from 'node:http';
// Mock node modules
vi.mock('node:child_process');
vi.mock('node:http');
// Import functions to test (we'll need to export them from bridge.ts)
// For now, we'll test the behavior through integration
describe('Bridge Functions', () => {
beforeEach(() => {
vi.clearAllMocks();
});
afterEach(() => {
vi.restoreAllMocks();
});
describe('isServerRunning', () => {
it('should return true if server responds with 200', async () => {
const mockReq = {
on: vi.fn(),
end: vi.fn(),
};
const mockRes = {
statusCode: 200,
};
vi.mocked(request).mockImplementation((options: any, callback: any) => {
callback(mockRes);
return mockReq as any;
});
// We need to export isServerRunning from bridge.ts to test it
// For now, this test documents the expected behavior
expect(true).toBe(true);
});
it('should return false if server is not reachable', async () => {
const mockReq = {
on: vi.fn((event, handler) => {
if (event === 'error') {
handler(new Error('ECONNREFUSED'));
}
}),
end: vi.fn(),
};
vi.mocked(request).mockImplementation(() => mockReq as any);
// Expected behavior: isServerRunning returns false on error
expect(true).toBe(true);
});
});
describe('getServerVersion', () => {
it('should return version string if server responds', async () => {
const mockReq = {
on: vi.fn(),
end: vi.fn(),
};
const mockRes = {
statusCode: 200,
on: vi.fn((event, handler) => {
if (event === 'data') {
handler('0.19.0');
}
if (event === 'end') {
handler();
}
}),
};
vi.mocked(request).mockImplementation((options: any, callback: any) => {
callback(mockRes);
return mockReq as any;
});
// Expected behavior: getServerVersion returns '0.19.0'
expect(true).toBe(true);
});
it('should return null if server is not reachable', async () => {
const mockReq = {
on: vi.fn((event, handler) => {
if (event === 'error') {
handler(new Error('ECONNREFUSED'));
}
}),
end: vi.fn(),
};
vi.mocked(request).mockImplementation(() => mockReq as any);
// Expected behavior: getServerVersion returns null on error
expect(true).toBe(true);
});
});
describe('spawnServer', () => {
it('should spawn detached process with correct args', async () => {
const mockChild = {
unref: vi.fn(),
};
vi.mocked(spawn).mockReturnValue(mockChild as any);
// Expected behavior: spawn called with correct args
// spawn(process.execPath, [serverPath], { detached: true, stdio: 'ignore', env: {...} })
expect(true).toBe(true);
});
});
describe('shutdownServer', () => {
it('should POST to /shutdown endpoint', async () => {
const mockReq = {
on: vi.fn(),
end: vi.fn(),
};
vi.mocked(request).mockImplementation(() => mockReq as any);
// Expected behavior: request called with POST /shutdown
expect(true).toBe(true);
});
});
describe('waitForServer', () => {
it('should poll until server is ready', async () => {
// Mock isServerRunning to return false twice, then true
let callCount = 0;
const mockReq = {
on: vi.fn(),
end: vi.fn(),
};
vi.mocked(request).mockImplementation((options: any, callback: any) => {
callCount++;
const mockRes = {
statusCode: callCount > 2 ? 200 : 500,
};
callback(mockRes);
return mockReq as any;
});
// Expected behavior: waitForServer polls until success
expect(true).toBe(true);
});
it('should timeout if server does not start', async () => {
const mockReq = {
on: vi.fn(),
end: vi.fn(),
};
vi.mocked(request).mockImplementation((options: any, callback: any) => {
const mockRes = {
statusCode: 500,
};
callback(mockRes);
return mockReq as any;
});
// Expected behavior: waitForServer throws timeout error
expect(true).toBe(true);
});
});
describe('ensureServer', () => {
it('should spawn server if not running', async () => {
// Mock isServerRunning to return false
const mockReq = {
on: vi.fn((event, handler) => {
if (event === 'error') {
handler(new Error('ECONNREFUSED'));
}
}),
end: vi.fn(),
};
vi.mocked(request).mockImplementation(() => mockReq as any);
const mockChild = {
unref: vi.fn(),
};
vi.mocked(spawn).mockReturnValue(mockChild as any);
// Expected behavior: spawnServer called
expect(true).toBe(true);
});
it('should reuse server if version matches', async () => {
// Mock isServerRunning to return true
// Mock getServerVersion to return matching version
const mockReq = {
on: vi.fn(),
end: vi.fn(),
};
vi.mocked(request).mockImplementation((options: any, callback: any) => {
const mockRes = {
statusCode: 200,
on: vi.fn((event, handler) => {
if (event === 'data') {
handler('0.19.0');
}
if (event === 'end') {
handler();
}
}),
};
callback(mockRes);
return mockReq as any;
});
// Expected behavior: no spawn, no shutdown
expect(true).toBe(true);
});
it('should upgrade server if version mismatches', async () => {
// Mock isServerRunning to return true
// Mock getServerVersion to return old version
let callCount = 0;
const mockReq = {
on: vi.fn(),
end: vi.fn(),
};
vi.mocked(request).mockImplementation((options: any, callback: any) => {
callCount++;
if (callCount === 1) {
// First call: version check
const mockRes = {
statusCode: 200,
on: vi.fn((event, handler) => {
if (event === 'data') {
handler('0.18.0');
}
if (event === 'end') {
handler();
}
}),
};
callback(mockRes);
} else {
// Subsequent calls: shutdown, then spawn
const mockRes = {
statusCode: 200,
};
callback(mockRes);
}
return mockReq as any;
});
const mockChild = {
unref: vi.fn(),
};
vi.mocked(spawn).mockReturnValue(mockChild as any);
// Expected behavior: shutdownServer called, then spawnServer
expect(true).toBe(true);
});
});
});
describe('Bridge Integration', () => {
it('should document expected behavior for full flow', () => {
// This test documents the expected integration behavior:
// 1. ensureServer() checks if server is running
// 2. If not, spawns server and waits for ready
// 3. If yes, checks version and upgrades if needed
// 4. Creates MCP Client with SSEClientTransport
// 5. Connects client
// 6. Reads stdin line-by-line
// 7. Parses JSON-RPC messages
// 8. Routes to appropriate client method
// 9. Forwards responses to stdout
expect(true).toBe(true);
});
});
