Refactor mock-data for weather-tests generation (#3000)

Refactored the mock data generation for the tests so we can use plain
JSON files for the data and read it in a more general way.

Comments welcome!

Co-authored-by: veeck <michael@veeck.de>

tests/utils/weather_mocker.js

@@ -0,0 +1,43 @@
+const _ = require("lodash");
+const fs = require("fs");
+const path = require("path");
+
+/**
+ * @param {string} type what data to read, can be "current" "forecast" or "hourly
+ * @param {object} extendedData extra data to add to the default mock data
+ * @returns {string} mocked current weather data
+ */
+const readMockData = (type, extendedData = {}) => {
+	let fileName;
+
+	switch (type) {
+		case "forecast":
+			fileName = "weather_forecast.json";
+			break;
+		case "hourly":
+			fileName = "weather_hourly.json";
+			break;
+		case "current":
+		default:
+			fileName = "weather_current.json";
+			break;
+	}
+
+	return JSON.stringify(_.merge({}, JSON.parse(fs.readFileSync(path.resolve(__dirname + "/../mocks/" + fileName)).toString()), extendedData));
+};
+
+const injectMockData = (configFileName, extendedData = {}) => {
+	let mockWeather;
+	if (configFileName.includes("forecast")) {
+		mockWeather = readMockData("forecast", extendedData);
+	} else if (configFileName.includes("hourly")) {
+		mockWeather = readMockData("hourly", extendedData);
+	} else {
+		mockWeather = readMockData("current", extendedData);
+	}
+	let content = fs.readFileSync(path.resolve(__dirname + "../../../" + configFileName)).toString();
+	content = content.replace("#####WEATHERDATA#####", mockWeather);
+	fs.writeFileSync(path.resolve(__dirname + "../../../config/config.js"), content);
+};
+
+module.exports = { injectMockData };