Add missing tests.

tests/testutils/src/main/kotlin/io/element/android/tests/testutils/WaitingForAssertion.kt

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2023 New Vector Ltd
+ *
+ * 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.
+ */
+
+package io.element.android.tests.testutils
+
+import kotlinx.coroutines.delay
+
+suspend fun waitForPredicate(
+    delayBetweenAttemptsMillis: Long = 1,
+    maxNumberOfAttempts: Int = 20,
+    predicate: () -> Boolean,
+) {
+    for (i in 0..maxNumberOfAttempts) {
+        if (predicate()) return
+        if (i < maxNumberOfAttempts) delay(delayBetweenAttemptsMillis)
+    }
+    throw AssertionError("Predicate was not true after $maxNumberOfAttempts attempts")
+}