Break out font size settings to a separate component

test/components/views/settings/FontScalingPanel-test.tsx

@@ -0,0 +1,38 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from 'react';
+import { mount } from "enzyme";
+
+import '../../../skinned-sdk';
+import * as TestUtils from "../../../test-utils";
+import _FontScalingPanel from '../../../../src/components/views/settings/FontScalingPanel';
+
+const FontScalingPanel = TestUtils.wrapInMatrixClientContext(_FontScalingPanel);
+
+import * as randomstring from "matrix-js-sdk/src/randomstring";
+// @ts-expect-error: override random function to make results predictable
+randomstring.randomString = () => "abdefghi";
+
+describe('FontScalingPanel', () => {
+    it('renders the font scaling UI', () => {
+        TestUtils.stubClient();
+        const wrapper = mount(
+            <FontScalingPanel />,
+        );
+        expect(wrapper).toMatchSnapshot();
+    });
+});