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MCP-Test-Client
MCP Test Client es una utilidad de prueba TypeScript para los servidores del protocolo de contexto del modelo (MCP).
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MCP Test Client
A testing utility for Model Context Protocol (MCP) servers. This client helps you test MCP server implementations by providing a simple interface for making tool calls and validating responses.
Features
- Easy-to-use testing interface for MCP servers
- Built-in support for tool listing and tool calls
- Type-safe implementation using TypeScript
- Assertion utilities for validating server responses
- Mock calculator server implementation for examples
Installation
bun install mcp-test-client
Usage
Basic Example
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');
}
);
});
});
Calculator Server Example
The package includes a mock calculator server for testing and learning purposes:
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');
}
);
});
});
API Reference
MCPTestClient
Constructor
constructor(config: { serverCommand: string; serverArgs: string[] })
Methods
-
init(): Promise<void>
- Initialize the client and connect to the server -
listTools(): Promise<Tool[]>
- Get a list of available tools from the server -
callTool(toolName: string, args: Record<string, unknown>): Promise<ToolResult>
- Call a specific tool -
assertToolCall(toolName: string, args: Record<string, unknown>, assertion: (result: ToolResult) => void | Promise<void>): Promise<void>
- Call a tool and run assertions on the result -
cleanup(): Promise<void>
- Clean up resources and disconnect from the server
Development
Prerequisites
- Bun (v1.0.0 or higher)
Setup
- Clone the repository
git clone <repository-url>
cd mcp-test-client
- Install dependencies
bun install
- Run tests
bun test
License
MIT
Contributing
- Fork the repository
- Create your feature branch (
git checkout -b feature/amazing-feature
) - Commit your changes (
git commit -m 'Add some amazing feature'
) - Push to the branch (
git push origin feature/amazing-feature
) - Open a Pull Request
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Reviews

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