inspector/client/src/lib/hooks/__tests__/useConnection.test.tsx

import { renderHook, act } from "@testing-library/react";
import { useConnection } from "../useConnection";
import { z } from "zod";
import { ClientRequest } from "@modelcontextprotocol/sdk/types.js";
import { DEFAULT_INSPECTOR_CONFIG } from "../../constants";

// Mock fetch
global.fetch = jest.fn().mockResolvedValue({
  json: () => Promise.resolve({ status: "ok" }),
});

// Mock the SDK dependencies
const mockRequest = jest.fn().mockResolvedValue({ test: "response" });
const mockClient = {
  request: mockRequest,
  notification: jest.fn(),
  connect: jest.fn().mockResolvedValue(undefined),
  close: jest.fn(),
  getServerCapabilities: jest.fn(),
  setNotificationHandler: jest.fn(),
  setRequestHandler: jest.fn(),
};

jest.mock("@modelcontextprotocol/sdk/client/index.js", () => ({
  Client: jest.fn().mockImplementation(() => mockClient),
}));

jest.mock("@modelcontextprotocol/sdk/client/sse.js", () => ({
  SSEClientTransport: jest.fn(),
  SseError: jest.fn(),
}));

jest.mock("@modelcontextprotocol/sdk/client/auth.js", () => ({
  auth: jest.fn().mockResolvedValue("AUTHORIZED"),
}));

// Mock the toast hook
jest.mock("@/hooks/use-toast", () => ({
  useToast: () => ({
    toast: jest.fn(),
  }),
}));

// Mock the auth provider
jest.mock("../../auth", () => ({
  authProvider: {
    tokens: jest.fn().mockResolvedValue({ access_token: "mock-token" }),
  },
}));

describe("useConnection", () => {
  const defaultProps = {
    transportType: "sse" as const,
    command: "",
    args: "",
    sseUrl: "http://localhost:8080",
    env: {},
    config: DEFAULT_INSPECTOR_CONFIG,
  };

  describe("Request Configuration", () => {
    beforeEach(() => {
      jest.clearAllMocks();
    });

    test("uses the default config values in makeRequest", async () => {
      const { result } = renderHook(() => useConnection(defaultProps));

      // Connect the client
      await act(async () => {
        await result.current.connect();
      });

      // Wait for state update
      await act(async () => {
        await new Promise((resolve) => setTimeout(resolve, 0));
      });

      const mockRequest: ClientRequest = {
        method: "ping",
        params: {},
      };

      const mockSchema = z.object({
        test: z.string(),
      });

      await act(async () => {
        await result.current.makeRequest(mockRequest, mockSchema);
      });

      expect(mockClient.request).toHaveBeenCalledWith(
        mockRequest,
        mockSchema,
        expect.objectContaining({
          timeout: DEFAULT_INSPECTOR_CONFIG.MCP_SERVER_REQUEST_TIMEOUT.value,
          maxTotalTimeout:
            DEFAULT_INSPECTOR_CONFIG.MCP_REQUEST_MAX_TOTAL_TIMEOUT.value,
          resetTimeoutOnProgress:
            DEFAULT_INSPECTOR_CONFIG.MCP_REQUEST_TIMEOUT_RESET_ON_PROGRESS
              .value,
        }),
      );
    });

    test("overrides the default config values when passed in options in makeRequest", async () => {
      const { result } = renderHook(() => useConnection(defaultProps));

      // Connect the client
      await act(async () => {
        await result.current.connect();
      });

      // Wait for state update
      await act(async () => {
        await new Promise((resolve) => setTimeout(resolve, 0));
      });

      const mockRequest: ClientRequest = {
        method: "ping",
        params: {},
      };

      const mockSchema = z.object({
        test: z.string(),
      });

      await act(async () => {
        await result.current.makeRequest(mockRequest, mockSchema, {
          timeout: 1000,
          maxTotalTimeout: 2000,
          resetTimeoutOnProgress: false,
        });
      });

      expect(mockClient.request).toHaveBeenCalledWith(
        mockRequest,
        mockSchema,
        expect.objectContaining({
          timeout: 1000,
          maxTotalTimeout: 2000,
          resetTimeoutOnProgress: false,
        }),
      );
    });
  });

  test("throws error when mcpClient is not connected", async () => {
    const { result } = renderHook(() => useConnection(defaultProps));

    const mockRequest: ClientRequest = {
      method: "ping",
      params: {},
    };

    const mockSchema = z.object({
      test: z.string(),
    });

    await expect(
      result.current.makeRequest(mockRequest, mockSchema),
    ).rejects.toThrow("MCP client not connected");
  });
});