MediaWiki Syntax MCP Server

/** * Tests for MediaWiki content fetcher module */ import { beforeEach, describe, expect, it, vi } from "vitest"; import { fetchPageContent } from "./mediawiki-fetcher.js"; // Mock fetch globally const mockFetch = vi.fn(); global.fetch = mockFetch; describe("MediaWiki Fetcher", () => { beforeEach(() => { vi.clearAllMocks(); }); describe("fetchPageContent", () => { it("should fetch page content successfully", async () => { const mockResponse = { json: async () => ({ query: { pages: { "12345": { extract: "This is the page content about formatting.", pageid: 12345, title: "Help:Formatting", }, }, }, }), ok: true, }; mockFetch.mockResolvedValueOnce(mockResponse); const result = await fetchPageContent( "https://www.mediawiki.org/wiki/Help:Formatting", ); expect(result).toBe("This is the page content about formatting."); expect(mockFetch).toHaveBeenCalledWith( expect.stringContaining("api.php"), expect.objectContaining({ headers: expect.objectContaining({ "User-Agent": expect.stringContaining("MediaWiki-Syntax-MCP"), }), }), ); }); it("should handle missing pages", async () => { const mockResponse = { json: async () => ({ query: { pages: { "-1": { missing: true, title: "Help:NonExistent", }, }, }, }), ok: true, }; mockFetch.mockResolvedValueOnce(mockResponse); await expect( fetchPageContent("https://www.mediawiki.org/wiki/Help:NonExistent"), ).rejects.toThrow("Page not found"); }); it("should handle HTTP errors", async () => { const mockResponse = { ok: false, status: 404, }; mockFetch.mockResolvedValueOnce(mockResponse); await expect( fetchPageContent("https://www.mediawiki.org/wiki/Help:NotFound"), ).rejects.toThrow("HTTP error! status: 404"); }); it("should handle network errors", async () => { mockFetch.mockRejectedValueOnce(new Error("Network error")); await expect( fetchPageContent("https://www.mediawiki.org/wiki/Help:Test"), ).rejects.toThrow("Failed to fetch content"); }); it("should handle invalid URLs", async () => { await expect(fetchPageContent("")).rejects.toThrow( "Invalid URL provided", ); await expect(fetchPageContent("not-a-url")).rejects.toThrow( "Invalid URL", ); }); it("should handle empty API response", async () => { const mockResponse = { json: async () => ({}), ok: true, }; mockFetch.mockResolvedValueOnce(mockResponse); await expect( fetchPageContent("https://www.mediawiki.org/wiki/Help:Test"), ).rejects.toThrow("No pages found in API response"); }); it("should handle missing extract in response", async () => { const mockResponse = { json: async () => ({ query: { pages: { "12345": { pageid: 12345, title: "Help:Test", // No extract field }, }, }, }), ok: true, }; mockFetch.mockResolvedValueOnce(mockResponse); const result = await fetchPageContent( "https://www.mediawiki.org/wiki/Help:Test", ); expect(result).toBe(""); }); it("should construct correct API URL and parameters", async () => { const mockResponse = { json: async () => ({ query: { pages: { "12345": { extract: "test content", }, }, }, }), ok: true, }; mockFetch.mockResolvedValueOnce(mockResponse); await fetchPageContent("https://www.mediawiki.org/wiki/Help:Formatting"); const fetchCall = mockFetch.mock.calls[0]; const url = fetchCall[0] as string; expect(url).toContain("api.php"); expect(url).toContain("action=query"); expect(url).toContain("prop=extracts"); expect(url).toContain("format=json"); expect(url).toContain("titles=Help%3AFormatting"); }); }); });