chore: 🤖 add snapshot testing

tests/unit/example.spec.js

@@ -3,48 +3,47 @@ import { Tree, VueTreeList } from "@/index";
 
 describe("VueTreeList", () => {
   it("renders correctly", () => {
+    const tree = new Tree([
+      {
+        name: "Node 1",
+        id: 1,
+        pid: 0,
+        dragDisabled: true,
+        addTreeNodeDisabled: true,
+        addLeafNodeDisabled: true,
+        editNodeDisabled: true,
+        delNodeDisabled: true,
+        children: [
+          {
+            name: "Node 1-2",
+            id: 2,
+            isLeaf: true,
+            pid: 1
+          }
+        ]
+      },
+      {
+        name: "Node 2",
+        id: 3,
+        pid: 0,
+        disabled: true
+      },
+      {
+        name: "Node 3",
+        id: 4,
+        pid: 0
+      }
+    ]);
+
     const wrapper = mount(VueTreeList, {
       propsData: {
-        model: new Tree([
-          {
-            name: "Node 1",
-            id: 1,
-            pid: 0,
-            dragDisabled: true,
-            addTreeNodeDisabled: true,
-            addLeafNodeDisabled: true,
-            editNodeDisabled: true,
-            delNodeDisabled: true,
-            children: [
-              {
-                name: "Node 1-2",
-                id: 2,
-                isLeaf: true,
-                pid: 1
-              }
-            ]
-          },
-          {
-            name: "Node 2",
-            id: 3,
-            pid: 0,
-            disabled: true
-          },
-          {
-            name: "Node 3",
-            id: 4,
-            pid: 0
-          }
-        ]),
+        model: tree,
         defaultTreeNodeName: "new node",
         defaultLeafNodeName: "new leaf",
         defaultExpanded: false
       }
     });
 
-    expect(wrapper.text()).toMatch(`Node 1················
-            Node 1-2················
-            Node 2················
-            Node 3`);
+    expect(wrapper).toMatchSnapshot();
   });
 });