diff --git a/extensions/browser/src/browser/pw-tools-core.interactions.batch.test.ts b/extensions/browser/src/browser/pw-tools-core.interactions.batch.test.ts
index 3a0ce7c0ec9..7beff563b24 100644
--- a/extensions/browser/src/browser/pw-tools-core.interactions.batch.test.ts
+++ b/extensions/browser/src/browser/pw-tools-core.interactions.batch.test.ts
@@ -38,6 +38,17 @@ vi.mock("./pw-tools-core.snapshot.js", () => ({
 
 const { batchViaPlaywright } = await import("./pw-tools-core.interactions.js");
 
+function firstEvaluateCall(): [unknown, { fnBody?: string; timeoutMs?: number }] {
+  if (!page) {
+    throw new Error("expected test page");
+  }
+  const [call] = page.evaluate.mock.calls;
+  if (!call) {
+    throw new Error("expected page.evaluate call");
+  }
+  return call as [unknown, { fnBody?: string; timeoutMs?: number }];
+}
+
 describe("batchViaPlaywright", () => {
   beforeEach(() => {
     vi.clearAllMocks();
@@ -56,7 +67,7 @@ describe("batchViaPlaywright", () => {
     });
 
     expect(result).toEqual({ results: [{ ok: true }] });
-    const [evaluateFn, evaluateOptions] = page?.evaluate.mock.calls[0] ?? [];
+    const [evaluateFn, evaluateOptions] = firstEvaluateCall();
     expect(typeof evaluateFn).toBe("function");
     expect(evaluateOptions?.fnBody).toBe("() => 1");
     expect(evaluateOptions?.timeoutMs).toBe(4500);