Address a TODO in tests

Bug: v8:8330
Change-Id: I2b8d5cef488ca56331448dcb11fad7a00f19d501
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2095638Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Joyee Cheung <joyee@igalia.com>
Cr-Commit-Position: refs/heads/master@{#66693}