Internal: add render-height Masonry integration test

playwright/masonry/render-height.spec.mjs

@@ -0,0 +1,27 @@
+// @flow strict
+import { expect, test } from '@playwright/test';
+import getGridItems from './utils/getGridItems.mjs';
+import getServerURL from './utils/getServerURL.mjs';
+import selectors from './utils/selectors.mjs';
+
+test.describe('Masonry: Render height', () => {
+  test('allows items to be positioned under the grid', async ({ page }) => {
+    await page.goto(getServerURL({ virtualize: true, finiteLength: true }));
+
+    const gridItems = await getGridItems(page);
+    expect(gridItems.length).toBeGreaterThan(0);
+
+    let bottomItem = 0;
+    for (let i = 0; i < gridItems.length; i += 1) {
+      const itemRect = await gridItems[i].boundingBox();
+      // eslint-disable-next-line playwright/no-conditional-in-test
+      if (itemRect.y > bottomItem) {
+        bottomItem = itemRect.y + itemRect.height;
+      }
+    }
+
+    const afterGrid = await page.locator(selectors.afterGrid);
+    const afterGridRect = await afterGrid.boundingBox();
+    expect(afterGridRect.y).toBeGreaterThanOrEqual(bottomItem);
+  });
+});