This is a testharness.js-based test.
Harness Error. harness_status.status = 1 , harness_status.message = 5 duplicate test names: "underlying sink's write should not be called until start finishes", "underlying sink's close should not be called until start finishes", "underlying sink's write or close should not be called if start throws", "underlying sink's write or close should not be invoked if the promise returned by start is rejected", "returning a thenable from start() should work"
PASS underlying sink's write should not be called until start finishes 
PASS underlying sink's close should not be called until start finishes 
PASS underlying sink's write or close should not be called if start throws 
PASS underlying sink's write or close should not be invoked if the promise returned by start is rejected 
PASS returning a thenable from start() should work 
PASS Untitled 
PASS underlying sink's write should not be called until start finishes 
PASS underlying sink's close should not be called until start finishes 
PASS underlying sink's write or close should not be called if start throws 
PASS underlying sink's write should not be called until start finishes 
PASS underlying sink's close should not be called until start finishes 
PASS underlying sink's write or close should not be called if start throws 
PASS underlying sink's write or close should not be invoked if the promise returned by start is rejected 
PASS returning a thenable from start() should work 
PASS underlying sink's write or close should not be invoked if the promise returned by start is rejected 
PASS returning a thenable from start() should work 
PASS underlying sink's write should not be called until start finishes 
PASS underlying sink's close should not be called until start finishes 
PASS underlying sink's write or close should not be called if start throws 
PASS underlying sink's write or close should not be invoked if the promise returned by start is rejected 
PASS returning a thenable from start() should work 
Harness: the test ran to completion.

