Fix tests and convert to RTL (#23474)

test/test-utils.ts

@@ -0,0 +1,51 @@
+/*
+Copyright 2016-2022 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.
+*/
+
+export function cleanLocalstorage(): void {
+    window.localStorage.clear();
+}
+
+export function deleteIndexedDB(dbName: string): Promise<void> {
+    return new Promise<void>((resolve, reject) => {
+        if (!window.indexedDB) {
+            resolve();
+            return;
+        }
+
+        const startTime = Date.now();
+        console.log(`${startTime}: Removing indexeddb instance: ${dbName}`);
+        const req = window.indexedDB.deleteDatabase(dbName);
+
+        req.onblocked = () => {
+            console.log(`${Date.now()}: can't yet delete indexeddb ${dbName} because it is open elsewhere`);
+        };
+
+        req.onerror = (ev) => {
+            reject(new Error(
+                `${Date.now()}: unable to delete indexeddb ${dbName}: ${req.error}`,
+            ));
+        };
+
+        req.onsuccess = () => {
+            const now = Date.now();
+            console.log(`${now}: Removed indexeddb instance: ${dbName} in ${now-startTime} ms`);
+            resolve();
+        };
+    }).catch((e) => {
+        console.error(`${Date.now()}: Error removing indexeddb instance ${dbName}: ${e}`);
+        throw e;
+    });
+}