Add some tests on RoomFlowNode

libraries/architecture/src/main/kotlin/io/element/android/libraries/architecture/ParentNodeExt.kt

@@ -0,0 +1,27 @@
+/*
+ * 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.libraries.architecture
+
+import com.bumble.appyx.core.children.nodeOrNull
+import com.bumble.appyx.core.node.Node
+import com.bumble.appyx.core.node.ParentNode
+
+fun <NavTarget : Any> ParentNode<NavTarget>.childNode(navTarget: NavTarget): Node? {
+    val childMap = children.value
+    val key = childMap.keys.find { it.navTarget == navTarget }
+    return childMap[key]?.nodeOrNull
+}