WIP server side.

server/tests/collection/NestedSet.test.js

@@ -0,0 +1,31 @@
+import { expect } from '~/testInit';
+import NestedSet from '@/collection/NestedSet';
+
+describe('NestedSet', () => {
+  it('Should link parent and children nodes.', () => {
+    const flattenArray = [
+      {
+        id: 1,
+      },
+      {
+        id: 2,
+        parent_id: 1,
+      },
+      {
+        id: 3,
+        parent_id: 1,
+      },
+      {
+        id: 4,
+        parent_id: 3,
+      },
+    ];
+
+    const collection = new NestedSet(flattenArray);
+
+    expect(collection[0].id).equals(1);
+    expect(collection[0].children[0].id).equals(2);
+    expect(collection[0].children[1].id).equals(3);
+    expect(collection[0].children[1].children[0].id).equals(4);
+  });
+});