chore: 🤖 add unit test

tests/unit/example.spec.js

@@ -0,0 +1,50 @@
+import { mount } from "@vue/test-utils";
+import { Tree, VueTreeList } from "@/index";
+
+describe("VueTreeList", () => {
+  it("renders correctly", () => {
+    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
+          }
+        ]),
+        defaultTreeNodeName: "new node",
+        defaultLeafNodeName: "new leaf",
+        defaultExpanded: false
+      }
+    });
+
+    expect(wrapper.text()).toMatch(`Node 1················
+            Node 1-2················
+            Node 2················
+            Node 3`);
+  });
+});