Date Operations MCP

import { beforeAll, describe, expect, it, vi } from "vitest"; // Import tool fns and schemas to compare identity with what's registered import { nowTool, formatTool, addTool, subtractTool, differenceTool, compareTool, } from "../tools.js"; import { formatParams, addParams, subtractParams, differenceParams, compareParams, } from "../params.js"; // Mock fastmcp to capture server wiring without starting a real server vi.mock("fastmcp", () => { const instances: any[] = []; class FakeFastMCP { public name: string; public version: string; public tools: any[] = []; public startConfig: any | undefined; constructor(opts: { name: string; version: string }) { this.name = opts.name; this.version = opts.version; instances.push(this); } addTool(tool: any) { this.tools.push(tool); } start(config: any) { this.startConfig = config; } } return { FastMCP: FakeFastMCP, __instances: instances }; }); let server: any; beforeAll(async () => { // Import after mocking to trigger registration into our fake await import("../index.js"); const fastmcpModule: any = await import("fastmcp"); const instances = fastmcpModule.__instances as any[]; expect(Array.isArray(instances)).toBe(true); expect(instances.length).toBe(1); server = instances[0]; }); describe("index server wiring", () => { it("constructs FastMCP and starts server with httpStream on port 3000", () => { expect(server.name).toBe("Date Operations"); expect(server.version).toBe("1.0.0"); expect(server.startConfig).toEqual({ transportType: "httpStream", httpStream: { port: 3000 }, }); }); it("registers all 6 tools", () => { expect(server.tools.length).toBe(6); }); const cases = [ { name: "now", desc: "Get the current date and time.", params: undefined, exec: nowTool, }, { name: "format", desc: "Get the current date.", params: formatParams, exec: formatTool, }, { name: "add", desc: "Add the specified years, months, weeks, days, hours, minutes, and seconds to the given date.", params: addParams, exec: addTool, }, { name: "subtract", desc: "Subtract the specified years, months, weeks, days, hours, minutes, and seconds to the given date.", params: subtractParams, exec: subtractTool, }, { name: "difference", desc: "Get the difference between two dates in years, months, weeks, days, hours, minutes, and seconds.", params: differenceParams, exec: differenceTool, }, { name: "compare", desc: "Compare whether the first date is after, before, or equal to the second date.", params: compareParams, exec: compareTool, }, ] as const; it.each(cases)( "registers '%s' with expected config", (c: (typeof cases)[number]) => { const { name, desc, params, exec } = c; const tool = server.tools.find((t: any) => t.name === name); expect(tool).toBeTruthy(); expect(tool.description).toBe(desc); if (params) { expect(tool.parameters).toBe(params); expect(typeof tool.parameters.parse).toBe("function"); } else { expect(tool.parameters).toBeUndefined(); } expect(tool.execute).toBe(exec); } ); });