bun install mcp-test-client

import { MCPTestClient } from 'mcp-test-client';

describe('MCP Server Tests', () => {
  let client: MCPTestClient;

  beforeAll(async () => {
    client = new MCPTestClient({
      serverCommand: 'bun',
      serverArgs: ['./path/to/your/server.ts'],
    });
    await client.init();
  });

  afterAll(async () => {
    await client.cleanup();
  });

  test('should list available tools', async () => {
    const tools = await client.listTools();
    expect(tools).toContainEqual(
      expect.objectContaining({
        name: 'your-tool-name',
        description: 'Your tool description',
      })
    );
  });

  test('should call a tool', async () => {
    await client.assertToolCall(
      'your-tool-name',
      { arg1: 'value1', arg2: 'value2' },
      (result) => {
        expect(result.content[0].text).toBe('expected result');
      }
    );
  });
});

import { MCPTestClient } from 'mcp-test-client';

describe('Calculator Server Tests', () => {
  let client: MCPTestClient;

  beforeAll(async () => {
    client = new MCPTestClient({
      serverCommand: 'bun',
      serverArgs: ['./tests/mocks/calculator.ts'],
    });
    await client.init();
  });

  afterAll(async () => {
    await client.cleanup();
  });

  test('should perform addition', async () => {
    await client.assertToolCall(
      'calculate',
      { operation: 'add', a: 5, b: 3 },
      (result) => {
        expect(result.content[0].text).toBe('8');
      }
    );
  });
});

constructor(config: { serverCommand: string; serverArgs: string[] })

git clone 
cd mcp-test-client

bun install

bun test