Refactor + improve test coverage for QR login (#9525)

test/components/views/elements/QRCode-test.tsx

@@ -0,0 +1,36 @@
+/*
+Copyright 2022 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 { render, waitFor, cleanup } from "@testing-library/react";
+import React from "react";
+
+import QRCode from "../../../../src/components/views/elements/QRCode";
+
+describe("<QRCode />", () => {
+    afterEach(() => {
+        cleanup();
+    });
+
+    it("renders a QR with defaults", async () => {
+        const { container, getAllByAltText } = render(<QRCode data="asd" />);
+        await waitFor(() => getAllByAltText('QR Code').length === 1);
+        expect(container).toMatchSnapshot();
+    });
+
+    it("renders a QR with high error correction level", async () => {
+        const { container, getAllByAltText } = render(<QRCode data="asd" errorCorrectionLevel="high" />);
+        await waitFor(() => getAllByAltText('QR Code').length === 1);
+        expect(container).toMatchSnapshot();
+    });
+});