Add E2E test for collision readiness probing across various terrain sizes

tests/e2e/collision-readiness.probe.e2e.ts

@@ -0,0 +1,72 @@
+import { expect, test } from "@playwright/test";
+
+import { createTerrain } from "../../src/document/terrains";
+import { createEmptySceneDocument } from "../../src/document/scene-document";
+import { createPlayerStartEntity } from "../../src/entities/entity-instances";
+import { replaceSceneDocument } from "./viewport-test-helpers";
+
+function createScene(options: { terrainSize?: number }) {
+  const document = createEmptySceneDocument({
+    name: `Collision readiness ${options.terrainSize ?? "empty"}`
+  });
+  const playerStart = createPlayerStartEntity({
+    id: "player-start-probe",
+    position: {
+      x: 0,
+      y: 1,
+      z: 0
+    },
+    navigationMode: "thirdPerson"
+  });
+
+  document.entities[playerStart.id] = playerStart;
+
+  if (options.terrainSize !== undefined) {
+    const terrain = createTerrain({
+      id: `terrain-${options.terrainSize}`,
+      sampleCountX: options.terrainSize,
+      sampleCountZ: options.terrainSize,
+      cellSize: 1
+    });
+
+    document.terrains[terrain.id] = terrain;
+  }
+
+  return document;
+}
+
+test("collision readiness probe", async ({ page }) => {
+  test.setTimeout(90_000);
+  const pageErrors: string[] = [];
+  const consoleMessages: string[] = [];
+
+  page.on("pageerror", (error) => {
+    pageErrors.push(error.message);
+  });
+  page.on("console", (message) => {
+    consoleMessages.push(`${message.type()}: ${message.text()}`);
+  });
+
+  await page.goto("/");
+  await page.evaluate((storageKey) => {
+    window.localStorage.removeItem(storageKey);
+  }, "webeditor3d.scene-document-draft");
+  await page.reload();
+
+  for (const terrainSize of [undefined, 100, 640]) {
+    await replaceSceneDocument(page, createScene({ terrainSize }));
+    await page.getByTestId("enter-run-mode").click();
+    await page.getByTestId("runner-shell").waitFor({ state: "visible" });
+    await expect(page.getByTestId("runner-loading-overlay")).toHaveClass(
+      /runner-canvas__loading-overlay--hidden/,
+      {
+        timeout: 20_000
+      }
+    );
+    await page.getByTestId("exit-run-mode").click();
+    await page.getByTestId("viewport-shell").waitFor({ state: "visible" });
+  }
+
+  console.log(consoleMessages.join("\n"));
+  expect(pageErrors).toEqual([]);
+});