diff --git a/src/customizationContext/__tests__/CustomizationContext.test.js b/src/customizationContext/__tests__/CustomizationContext.test.js
new file mode 100644
index 0000000..9634afb
--- /dev/null
+++ b/src/customizationContext/__tests__/CustomizationContext.test.js
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2019-2022 CZ.NIC z.s.p.o. (https://www.nic.cz/)
+ *
+ * This is free software, licensed under the GNU General Public License v3.
+ * See /LICENSE for more information.
+ */
+
+import React from "react";
+
+import { render, wait } from "customTestRender";
+import mockAxios from "jest-mock-axios";
+
+import {
+    useCustomizationContext,
+    CustomizationContextProvider,
+} from "../CustomizationContext";
+
+const CUSTOM = "Description / component for customized reForis (Shield)";
+const ORIGINAL = "Description / component for original reForis (other devices)";
+
+function CustomizationTest() {
+    const isCustomized = useCustomizationContext();
+
+    return <p>{isCustomized ? CUSTOM : ORIGINAL}</p>;
+}
+
+describe("CustomizationContext", () => {
+    let componentContainer;
+
+    it("should render component without customization", async () => {
+        const { container, getByText } = render(
+            <CustomizationContextProvider>
+                <CustomizationTest />
+            </CustomizationContextProvider>
+        );
+        componentContainer = container;
+
+        mockAxios.mockResponse({ data: {} });
+        await wait(() => getByText(ORIGINAL));
+
+        expect(componentContainer).toMatchSnapshot();
+    });
+
+    it("should render customized component", async () => {
+        const { container, getByText } = render(
+            <CustomizationContextProvider>
+                <CustomizationTest />
+            </CustomizationContextProvider>
+        );
+        componentContainer = container;
+
+        mockAxios.mockResponse({ data: { customization: "shield" } });
+        await wait(() => getByText(CUSTOM));
+
+        expect(componentContainer).toMatchSnapshot();
+    });
+});
diff --git a/src/customizationContext/__tests__/__snapshots__/CustomizationContext.test.js.snap b/src/customizationContext/__tests__/__snapshots__/CustomizationContext.test.js.snap
new file mode 100644
index 0000000..eb6fb1b
--- /dev/null
+++ b/src/customizationContext/__tests__/__snapshots__/CustomizationContext.test.js.snap
@@ -0,0 +1,17 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`CustomizationContext should render component without customization 1`] = `
+<div>
+  <p>
+    Description / component for original reForis (other devices)
+  </p>
+</div>
+`;
+
+exports[`CustomizationContext should render customized component 1`] = `
+<div>
+  <p>
+    Description / component for customized reForis (Shield)
+  </p>
+</div>
+`;
diff --git a/src/testUtils/customTestRender.js b/src/testUtils/customTestRender.js
index 8d41a60..c256358 100644
--- a/src/testUtils/customTestRender.js
+++ b/src/testUtils/customTestRender.js
@@ -14,6 +14,7 @@ import { render } from "@testing-library/react";
 import PropTypes from "prop-types";
 
 import { AlertContextMock } from "./alertContextMock";
+import { CustomizationContextMock } from "./cutomizationContextMock";
 
 Wrapper.propTypes = {
     children: PropTypes.oneOfType([
@@ -25,9 +26,11 @@ Wrapper.propTypes = {
 function Wrapper({ children }) {
     return (
         <AlertContextMock>
-            <StaticRouter>
-                <UIDReset>{children}</UIDReset>
-            </StaticRouter>
+            <CustomizationContextMock>
+                <StaticRouter>
+                    <UIDReset>{children}</UIDReset>
+                </StaticRouter>
+            </CustomizationContextMock>
         </AlertContextMock>
     );
 }
diff --git a/src/testUtils/cutomizationContextMock.js b/src/testUtils/cutomizationContextMock.js
new file mode 100644
index 0000000..3b07a29
--- /dev/null
+++ b/src/testUtils/cutomizationContextMock.js
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2019-2022 CZ.NIC z.s.p.o. (https://www.nic.cz/)
+ *
+ * This is free software, licensed under the GNU General Public License v3.
+ * See /LICENSE for more information.
+ */
+
+import React from "react";
+
+window.CustomizationContext = React.createContext();
+
+const isCustomized = jest.fn();
+
+function CustomizationContextMock({ children }) {
+    return (
+        <CustomizationContext.Provider value={isCustomized}>
+            {children}
+        </CustomizationContext.Provider>
+    );
+}
+
+export { CustomizationContextMock };