This is a testharness.js-based test.
[FAIL] neither on worker: Check that RTCDataChannelStats messages/bytes Sent/Received are correct for various strings
  assert_equals: Got expected sender bytesSent expected 5 but got 0
[FAIL] neither on worker: Check that RTCDataChannelStats messages/bytes Sent/Received are correct for various binary messages received as arraybuffer
  assert_equals: Got expected sender bytesSent expected 5 but got 0
[FAIL] neither on worker: Check that RTCDataChannelStats messages/bytes Sent/Received are correct for various binary messages received as blob
  assert_equals: Got expected sender bytesSent expected 5 but got 0
[FAIL] offerer on worker: Check that RTCDataChannelStats messages/bytes Sent/Received are correct for various strings
  assert_equals: Got expected sender bytesSent expected 5 but got 0
[FAIL] offerer on worker: Check that RTCDataChannelStats messages/bytes Sent/Received are correct for various binary messages received as arraybuffer
  assert_equals: Got expected sender bytesSent expected 5 but got 0
[FAIL] offerer on worker: Check that RTCDataChannelStats messages/bytes Sent/Received are correct for various binary messages received as blob
  assert_equals: Got expected sender bytesSent expected 5 but got 0
[FAIL] answerer on worker: Check that RTCDataChannelStats messages/bytes Sent/Received are correct for various strings
  assert_equals: Got expected sender bytesSent expected 5 but got 0
[FAIL] answerer on worker: Check that RTCDataChannelStats messages/bytes Sent/Received are correct for various binary messages received as arraybuffer
  assert_equals: Got expected sender bytesSent expected 5 but got 0
[FAIL] answerer on worker: Check that RTCDataChannelStats messages/bytes Sent/Received are correct for various binary messages received as blob
  assert_equals: Got expected sender bytesSent expected 5 but got 0
Harness: the test ran to completion.