ntries().length, 1);
  const entry = layoutShiftEntryList.getEntries()[0];
  assert_equals(entry.entryType, "layout-shift");
  assert_equals(entry.name, "");
  assert_greater_than(entry.startTime, startTime,
    "The layout shift entry startTime should be greater than the test startTime.");
  assert_less_than(entry.startTime, endTime,
    "The layout shift entry startTime should be less than the test endTime.");
  assert_equals(entry.duration, 0.0);
  // The layout shift value should be:
  // 300 * (100 + 6