MCP Weather Server

import { WeatherAPI } from "../src/utils/api"; import { GeocodingResult, WeatherData } from "../src/types/weather"; // Mock fetch globally global.fetch = jest.fn(); const mockedFetch = fetch as jest.MockedFunction<typeof fetch>; describe("WeatherAPI", () => { beforeEach(() => { jest.clearAllMocks(); // Clear console.error mock calls jest.spyOn(console, "error").mockImplementation(() => {}); }); afterEach(() => { jest.restoreAllMocks(); }); describe("getCoordinates", () => { it("should return coordinates for a valid city", async () => { // Arrange const city = "London"; const mockGeocodingResponse: GeocodingResult = { results: [ { latitude: 51.5074, longitude: -0.1278, name: "London", country: "United Kingdom", admin1: "England", }, ], }; mockedFetch.mockResolvedValueOnce({ ok: true, status: 200, json: async () => mockGeocodingResponse, } as Response); // Act const result = await WeatherAPI.getCoordinates(city); // Assert expect(result).toEqual({ latitude: 51.5074, longitude: -0.1278 }); expect(mockedFetch).toHaveBeenCalledWith( "https://geocoding-api.open-meteo.com/v1/search?name=London&count=1&language=en&format=json" ); }); it("should handle cities with special characters", async () => { // Arrange const city = "São Paulo"; const mockGeocodingResponse: GeocodingResult = { results: [ { latitude: -23.5505, longitude: -46.6333, name: "São Paulo", country: "Brazil", }, ], }; mockedFetch.mockResolvedValueOnce({ ok: true, status: 200, json: async () => mockGeocodingResponse, } as Response); // Act const result = await WeatherAPI.getCoordinates(city); // Assert expect(result).toEqual({ latitude: -23.5505, longitude: -46.6333 }); expect(mockedFetch).toHaveBeenCalledWith( "https://geocoding-api.open-meteo.com/v1/search?name=S%C3%A3o%20Paulo&count=1&language=en&format=json" ); }); it("should handle cities with spaces", async () => { // Arrange const city = "New York City"; const mockGeocodingResponse: GeocodingResult = { results: [ { latitude: 40.7128, longitude: -74.006, name: "New York City", country: "United States", admin1: "New York", }, ], }; mockedFetch.mockResolvedValueOnce({ ok: true, status: 200, json: async () => mockGeocodingResponse, } as Response); // Act const result = await WeatherAPI.getCoordinates(city); // Assert expect(result).toEqual({ latitude: 40.7128, longitude: -74.006 }); expect(mockedFetch).toHaveBeenCalledWith( "https://geocoding-api.open-meteo.com/v1/search?name=New%20York%20City&count=1&language=en&format=json" ); }); it("should return null when no results are found", async () => { // Arrange const city = "NonExistentCity"; const mockGeocodingResponse: GeocodingResult = { results: [], }; mockedFetch.mockResolvedValueOnce({ ok: true, status: 200, json: async () => mockGeocodingResponse, } as Response); // Act const result = await WeatherAPI.getCoordinates(city); // Assert expect(result).toBeNull(); }); it("should return null when results property is undefined", async () => { // Arrange const city = "TestCity"; const mockGeocodingResponse: GeocodingResult = {}; mockedFetch.mockResolvedValueOnce({ ok: true, status: 200, json: async () => mockGeocodingResponse, } as Response); // Act const result = await WeatherAPI.getCoordinates(city); // Assert expect(result).toBeNull(); }); it("should handle HTTP error responses", async () => { // Arrange const city = "London"; mockedFetch.mockResolvedValueOnce({ ok: false, status: 404, statusText: "Not Found", } as Response); // Act const result = await WeatherAPI.getCoordinates(city); // Assert expect(result).toBeNull(); }); it("should handle network errors", async () => { // Arrange const city = "London"; mockedFetch.mockRejectedValueOnce(new Error("Network error")); // Act const result = await WeatherAPI.getCoordinates(city); // Assert expect(result).toBeNull(); }); it("should handle JSON parsing errors", async () => { // Arrange const city = "London"; mockedFetch.mockResolvedValueOnce({ ok: true, status: 200, json: async () => { throw new Error("Invalid JSON"); }, } as unknown as Response); // Act const result = await WeatherAPI.getCoordinates(city); // Assert expect(result).toBeNull(); }); it("should handle empty city name", async () => { // Arrange const city = ""; const mockGeocodingResponse: GeocodingResult = { results: [], }; mockedFetch.mockResolvedValueOnce({ ok: true, status: 200, json: async () => mockGeocodingResponse, } as Response); // Act const result = await WeatherAPI.getCoordinates(city); // Assert expect(result).toBeNull(); expect(mockedFetch).toHaveBeenCalledWith( "https://geocoding-api.open-meteo.com/v1/search?name=&count=1&language=en&format=json" ); }); }); describe("getCurrentWeather", () => { it("should return weather data for valid coordinates", async () => { // Arrange const latitude = 51.5074; const longitude = -0.1278; const mockWeatherResponse: WeatherData = { current_weather: { temperature: 15.5, windspeed: 12.3, winddirection: 180, weathercode: 0, is_day: 1, time: "2023-01-01T12:00", }, }; mockedFetch.mockResolvedValueOnce({ ok: true, status: 200, json: async () => mockWeatherResponse, } as Response); // Act const result = await WeatherAPI.getCurrentWeather(latitude, longitude); // Assert expect(result).toEqual(mockWeatherResponse); expect(mockedFetch).toHaveBeenCalledWith( "https://api.open-meteo.com/v1/forecast?latitude=51.5074&longitude=-0.1278&current_weather=true" ); }); it("should handle negative coordinates", async () => { // Arrange const latitude = -23.5505; const longitude = -46.6333; const mockWeatherResponse: WeatherData = { current_weather: { temperature: 22.0, windspeed: 8.5, winddirection: 90, weathercode: 1, is_day: 1, time: "2023-01-01T15:00", }, }; mockedFetch.mockResolvedValueOnce({ ok: true, status: 200, json: async () => mockWeatherResponse, } as Response); // Act const result = await WeatherAPI.getCurrentWeather(latitude, longitude); // Assert expect(result).toEqual(mockWeatherResponse); expect(mockedFetch).toHaveBeenCalledWith( "https://api.open-meteo.com/v1/forecast?latitude=-23.5505&longitude=-46.6333&current_weather=true" ); }); it("should handle extreme coordinates", async () => { // Arrange const latitude = 90; // North Pole const longitude = 0; const mockWeatherResponse: WeatherData = { current_weather: { temperature: -40.0, windspeed: 50.0, winddirection: 270, weathercode: 71, is_day: 0, time: "2023-01-01T00:00", }, }; mockedFetch.mockResolvedValueOnce({ ok: true, status: 200, json: async () => mockWeatherResponse, } as Response); // Act const result = await WeatherAPI.getCurrentWeather(latitude, longitude); // Assert expect(result).toEqual(mockWeatherResponse); expect(mockedFetch).toHaveBeenCalledWith( "https://api.open-meteo.com/v1/forecast?latitude=90&longitude=0&current_weather=true" ); }); it("should handle decimal coordinates", async () => { // Arrange const latitude = 40.123456789; const longitude = -74.987654321; const mockWeatherResponse: WeatherData = { current_weather: { temperature: 18.7, windspeed: 15.2, winddirection: 270, weathercode: 2, is_day: 0, time: "2023-01-01T20:00", }, }; mockedFetch.mockResolvedValueOnce({ ok: true, status: 200, json: async () => mockWeatherResponse, } as Response); // Act const result = await WeatherAPI.getCurrentWeather(latitude, longitude); // Assert expect(result).toEqual(mockWeatherResponse); expect(mockedFetch).toHaveBeenCalledWith( "https://api.open-meteo.com/v1/forecast?latitude=40.123456789&longitude=-74.987654321&current_weather=true" ); }); it("should handle HTTP error responses", async () => { // Arrange const latitude = 51.5074; const longitude = -0.1278; mockedFetch.mockResolvedValueOnce({ ok: false, status: 500, statusText: "Internal Server Error", } as Response); // Act const result = await WeatherAPI.getCurrentWeather(latitude, longitude); // Assert expect(result).toBeNull(); }); it("should handle network errors", async () => { // Arrange const latitude = 51.5074; const longitude = -0.1278; mockedFetch.mockRejectedValueOnce(new Error("Network timeout")); // Act const result = await WeatherAPI.getCurrentWeather(latitude, longitude); // Assert expect(result).toBeNull(); }); it("should handle JSON parsing errors", async () => { // Arrange const latitude = 51.5074; const longitude = -0.1278; mockedFetch.mockResolvedValueOnce({ ok: true, status: 200, json: async () => { throw new Error("Malformed JSON"); }, } as unknown as Response); // Act const result = await WeatherAPI.getCurrentWeather(latitude, longitude); // Assert expect(result).toBeNull(); }); it("should handle zero coordinates", async () => { // Arrange const latitude = 0; const longitude = 0; const mockWeatherResponse: WeatherData = { current_weather: { temperature: 26.5, windspeed: 3.2, winddirection: 45, weathercode: 0, is_day: 1, time: "2023-01-01T12:00", }, }; mockedFetch.mockResolvedValueOnce({ ok: true, status: 200, json: async () => mockWeatherResponse, } as Response); // Act const result = await WeatherAPI.getCurrentWeather(latitude, longitude); // Assert expect(result).toEqual(mockWeatherResponse); expect(mockedFetch).toHaveBeenCalledWith( "https://api.open-meteo.com/v1/forecast?latitude=0&longitude=0&current_weather=true" ); }); it("should handle weather data with all possible weather codes", async () => { // Arrange const latitude = 51.5074; const longitude = -0.1278; const mockWeatherResponse: WeatherData = { current_weather: { temperature: 15.5, windspeed: 12.3, winddirection: 180, weathercode: 95, // Thunderstorm is_day: 1, time: "2023-01-01T12:00", }, }; mockedFetch.mockResolvedValueOnce({ ok: true, status: 200, json: async () => mockWeatherResponse, } as Response); // Act const result = await WeatherAPI.getCurrentWeather(latitude, longitude); // Assert expect(result).toEqual(mockWeatherResponse); expect(result?.current_weather.weathercode).toBe(95); }); it("should handle night time weather (is_day = 0)", async () => { // Arrange const latitude = 51.5074; const longitude = -0.1278; const mockWeatherResponse: WeatherData = { current_weather: { temperature: 10.2, windspeed: 8.7, winddirection: 225, weathercode: 3, is_day: 0, time: "2023-01-01T22:00", }, }; mockedFetch.mockResolvedValueOnce({ ok: true, status: 200, json: async () => mockWeatherResponse, } as Response); // Act const result = await WeatherAPI.getCurrentWeather(latitude, longitude); // Assert expect(result).toEqual(mockWeatherResponse); expect(result?.current_weather.is_day).toBe(0); }); }); });