w2 IVAN assignment

assignments/hackyourtemperature_W2/.gitignore

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+.env

assignments/hackyourtemperature_W2/__tests__/app.test.js

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+import app from "../app.js";
+import supertest from "supertest";
+
+const request = supertest(app);
+
+describe("POST /weather", () => {
+  it("should return 400 if cityName is missing", async () => {
+    const res = await request.post("/weather").send({});
+    expect(res.status).toBe(400);
+    expect(res.body.weatherText).toBe("cityName is required");
+  });
+
+  it("should return 404 if cityName is invalid", async () => {
+    const res = await request.post("/weather").send({ cityName: "InvalidCity123" });
+    expect(res.status).toBe(404);
+    expect(res.body.weatherText).toBe("City is not found!");
+  });
+
+  it("should return temperature if cityName is valid", async () => {
+    const res = await request.post("/weather").send({ cityName: "Amsterdam" });
+    expect(res.status).toBe(200);
+    expect(res.body.weatherText).toContain("The temperature in Amsterdam is");
+  });
+});

assignments/hackyourtemperature_W2/app.js

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+import express from "express";
+import keys from "./sources/keys.js";
+
+const app = express();
+app.use(express.json());
+
+// Проверка работы сервера === test route
+app.get("/", (req, res) => {
+  res.send("hello from backend to frontend!");
+});
+
+// Получение погоды по названию города ===  get weather by city name
+app.post("/weather", async (req, res) => {
+  const cityName = req.body.cityName;
+
+  // Если город не указан === if city is not provided
+  if (!cityName) {
+    return res.status(400).json({ weatherText: "cityName is required" });
+  }
+
+  try {
+    // Запрос к OpenWeather API === request to OpenWeather API
+    const response = await fetch(
+      `https://api.openweathermap.org/data/2.5/weather?q=${cityName}&appid=${keys.API_KEY}&units=metric`
+    );
+    const data = await response.json();
+
+    // Если город не найден === if city is not found
+    if (data.cod !== 200) {
+      return res.status(404).json({ weatherText: "City is not found!" });
+    }
+
+    // Отправка температуры пользователю === send temperature to user
+    const temperature = data.main.temp;
+    res.json({ weatherText: `The temperature in ${data.name} is ${temperature}°C` });
+  } catch (error) {
+    // Ошибка сервера === server error
+    res.status(500).json({ weatherText: "Server error!" });
+  }
+});
+
+// Экспорт для тестов и сервера === export for tests and server
+export default app;

assignments/hackyourtemperature_W2/babel.config.cjs

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+module.exports = {
+  presets: [
+    [
+      "@babel/preset-env",
+      {
+        targets: {
+          node: "current" // чтобы Jest понимал текущую версию Node ===  for Jest to understand the current Node version
+        }
+      }
+    ]
+  ]
+};

assignments/hackyourtemperature_W2/package.json

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+{
+  "name": "hackyourtemperature_w2",
+  "version": "1.0.0",
+  "type": "module",
+  "main": "index.js",
+  "scripts": {
+    "test": "jest",
+    "start": "node server.js",
+    "dev": "nodemon server.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "description": "",
+  "dependencies": {
+    "dotenv": "^17.2.3",
+    "express": "^5.1.0",
+    "node-fetch": "^3.3.2"
+  },
+  "devDependencies": {
+    "@babel/preset-env": "^7.28.5",
+    "babel-jest": "^30.2.0",
+    "jest": "^30.2.0",
+    "nodemon": "^3.1.10",
+    "supertest": "^7.1.4"
+  }
+}

assignments/hackyourtemperature_W2/server.js

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+import app from "./app.js";
+// Start the server === don't add funktionality in this file
+const PORT = 3000;
+app.listen(PORT, () => console.log(`Server running on http://localhost:${PORT}`));

assignments/hackyourtemperature_W2/sources/keys.js

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+// sources/keys.js
+import dotenv from "dotenv";
+dotenv.config(); // Загружает переменные из .env === loads variables from .env
+
+const keys = {
+  API_KEY: process.env.API_KEY || "" // fallback на пустую строку === fallback to empty string
+};
+
+export default keys;