This is a testharness.js-based test.
[FAIL] fetchLater() rejects max+1 payload in a POST request body of String.
  assert_throws_quotaexceedederror: function "() => {\n    fetchLater(requestUrl, {\n      activateAfter: 0,\n      method: 'POST',\n      body: generatePayload(\n          getRemainingQuota(QUOTA_PER_ORIGIN, requestUrl, headers) + 1,\n          dataType),\n      referrer: '',\n    });\n  }" threw object "QuotaExceededError: Failed to execute 'fetchLater' on 'Window': fetchLater exceeds its quota for the origin: got 65537 bytes, expected less than 65536 bytes." that is not a correct QuotaExceededError: property "requested" is equal to null, expected 65537
Harness: the test ran to completion.