mcp-youtube

/* eslint-env node */ /* eslint-parser-options project: ["./tsconfig.test.json"] */ import { GetChannelTopVideosTool } from "../getChannelTopVideos"; import type { YoutubeService } from "../../../services/youtube.service"; import { IServiceContainer } from "../../../container"; // Only mock the service jest.mock("../../../services/youtube.service"); describe("GetChannelTopVideosTool", () => { let mockYoutubeService: jest.Mocked<YoutubeService>; let tool: GetChannelTopVideosTool; beforeEach(() => { mockYoutubeService = { getChannelTopVideos: jest.fn(), } as unknown as jest.Mocked<YoutubeService>; const container = { youtubeService: mockYoutubeService, } as unknown as IServiceContainer; tool = new GetChannelTopVideosTool(container); jest.clearAllMocks(); }); it("should be defined", () => { expect(tool).toBeDefined(); expect(tool.name).toBe("getChannelTopVideos"); }); it("should return top videos using default optional parameters", async () => { const mockTopVideosResult = [ { id: "vid1", title: "Video 1" }, { id: "vid2", title: "Video 2" }, ]; mockYoutubeService.getChannelTopVideos.mockResolvedValue( mockTopVideosResult as any ); // Only providing required channelId const params = { channelId: "UC123" }; const result = await tool.execute(params); // Assert defaults were applied: maxResults=10, includeTags=false, descriptionDetail=NONE expect(mockYoutubeService.getChannelTopVideos).toHaveBeenCalledWith({ channelId: "UC123", maxResults: 10, includeTags: false, descriptionDetail: "NONE", }); expect(result.success).toBe(true); expect(JSON.parse(result.content[0].text as string)).toEqual( mockTopVideosResult ); }); it("should correctly pass all provided optional parameters", async () => { const mockTopVideosResult = [{ id: "vid1", title: "Detailed Video" }]; mockYoutubeService.getChannelTopVideos.mockResolvedValue( mockTopVideosResult as any ); const params = { channelId: "UC123", maxResults: 5, includeTags: true, descriptionDetail: "SNIPPET" as const, // "as const" ensures it matches the Zod Enum type }; await tool.execute(params); expect(mockYoutubeService.getChannelTopVideos).toHaveBeenCalledWith({ channelId: "UC123", maxResults: 5, includeTags: true, descriptionDetail: "SNIPPET", }); }); it("should return a validation error for an invalid channelId", async () => { const params = { channelId: "" }; // Empty string const result = await tool.execute(params); expect(mockYoutubeService.getChannelTopVideos).not.toHaveBeenCalled(); expect(result.isError).toBe(true); // Expect error to specifically mention the field expect(result.content[0].text).toMatch(/channelId/); }); it("should return a validation error if maxResults is less than 1", async () => { const params = { channelId: "UC123", maxResults: 0 }; const result = await tool.execute(params); expect(mockYoutubeService.getChannelTopVideos).not.toHaveBeenCalled(); expect(result.isError).toBe(true); expect(result.content[0].text).toContain("maxResults"); }); it("should return a validation error if maxResults is greater than 500", async () => { const params = { channelId: "UC123", maxResults: 501 }; const result = await tool.execute(params); expect(mockYoutubeService.getChannelTopVideos).not.toHaveBeenCalled(); expect(result.isError).toBe(true); expect(result.content[0].text).toContain("maxResults"); }); it("should return a validation error if descriptionDetail is invalid", async () => { const params = { channelId: "UC123", descriptionDetail: "INVALID_OPTION", }; // @ts-ignore - deliberately passing invalid enum for test const result = await tool.execute(params); expect(mockYoutubeService.getChannelTopVideos).not.toHaveBeenCalled(); expect(result.isError).toBe(true); expect(result.content[0].text).toContain("Invalid option: expected one of"); }); it("should handle service errors gracefully", async () => { const errorMessage = "API Error"; mockYoutubeService.getChannelTopVideos.mockRejectedValue( new Error(errorMessage) ); const params = { channelId: "UC123" }; const result = await tool.execute(params); expect(mockYoutubeService.getChannelTopVideos).toHaveBeenCalled(); expect(result.isError).toBe(true); expect(result.content[0].text).toBe(`Error: ${errorMessage}`); }); });