get group resize, enter and exit working

frontend/tests/groupDrag.test.mjs

@@ -0,0 +1,26 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+
+import {
+  GROUP_DRAG_RELEASE_DISTANCE,
+  getPointDistanceOutsideRect,
+  shouldReleaseFromGroup,
+} from '../src/groupDrag.js';
+
+test('getPointDistanceOutsideRect returns zero inside the rect', () => {
+  const rect = { left: 10, top: 20, right: 110, bottom: 120 };
+  assert.equal(getPointDistanceOutsideRect(rect, { x: 60, y: 70 }), 0);
+});
+
+test('shouldReleaseFromGroup waits for a small overshoot before releasing', () => {
+  const rect = { left: 10, top: 20, right: 110, bottom: 120 };
+
+  assert.equal(
+    shouldReleaseFromGroup(rect, { x: 110 + GROUP_DRAG_RELEASE_DISTANCE - 1, y: 70 }),
+    false,
+  );
+  assert.equal(
+    shouldReleaseFromGroup(rect, { x: 110 + GROUP_DRAG_RELEASE_DISTANCE, y: 70 }),
+    true,
+  );
+});