get group resize, enter and exit working

frontend/tests/groupSizing.test.mjs

@@ -0,0 +1,26 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+
+import { getGroupMinimumSize } from '../src/groupSizing.js';
+
+test('getGroupMinimumSize keeps the base minimum for empty groups', () => {
+  assert.deepEqual(getGroupMinimumSize([]), { width: 260, height: 180 });
+});
+
+test('getGroupMinimumSize grows to fit child bounds plus padding', () => {
+  const nodes = [
+    {
+      position: { x: 24, y: 60 },
+      style: { width: 180, height: 100 },
+    },
+    {
+      position: { x: 260, y: 150 },
+      style: { width: 220, height: 140 },
+    },
+  ];
+
+  assert.deepEqual(getGroupMinimumSize(nodes), {
+    width: 504,
+    height: 314,
+  });
+});