v7

test/tree/node.dart

@@ -0,0 +1,71 @@
+class Node {
+  final String value;
+  final List<Node> children;
+
+  Node({required this.value, this.children = const []});
+
+  @override
+  String toString() {
+    return 'Node{value: $value}';
+  }
+}
+
+Node root = Node(value: 'root', children: [
+  Node(
+    value: '1',
+    children: [
+      Node(value: '1-1'),
+      Node(value: '1-2'),
+      Node(value: '1-3'),
+    ],
+  ),
+  Node(
+    value: '2',
+    children: [
+      Node(value: '2-1'),
+      Node(value: '2-2'),
+      Node(value: '2-3',children: [
+        Node(value: '2-3-1',),
+      ]),
+    ],
+  ),
+  Node(
+    value: '3',
+    children: [
+      Node(value: '3-1'),
+      Node(value: '3-2', children: [
+        Node(value: '3-2-1',),
+      ]),
+    ],
+  ),
+]);
+
+Node root2 = Node(value: '/', children: [
+  Node(
+    value: '/1',
+    children: [
+      Node(value: '/1/1'),
+      Node(value: '/1/2'),
+      Node(value: '/1/3'),
+    ],
+  ),
+  Node(
+    value: '/2',
+    children: [
+      Node(value: '/2/1'),
+      Node(value: '/2/2'),
+      Node(value: '/2/3',children: [
+        Node(value: '/2/3/1',),
+      ]),
+    ],
+  ),
+  Node(
+    value: '/3',
+    children: [
+      Node(value: '/3/1'),
+      Node(value: '/3/2', children: [
+        Node(value: '/3/2/1',),
+      ]),
+    ],
+  ),
+]);