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tests/__mocks__/browserMocks.js

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+// Mock Browser API's which are not supported by JSDOM, e.g. ServiceWorker, LocalStorage
+/**
+ * An example how to mock localStorage is given below 👇
+ */
+
+/*
+// Mocks localStorage
+const localStorageMock = (function() {
+	let store = {};
+
+	return {
+		getItem: (key) => store[key] || null,
+		setItem: (key, value) => store[key] = value.toString(),
+		clear: () => store = {}
+	};
+
+})();
+
+Object.defineProperty(window, 'localStorage', {
+	value: localStorageMock
+}); */