LayoutTests/streams/reference-implementation/brand-checks-expected.txt

PASS WritableStream.prototype.closed enforces a brand check 
PASS WritableStream.prototype.ready enforces a brand check 
PASS WritableStream.prototype.state enforces a brand check 
PASS WritableStream.prototype.abort enforces a brand check 
PASS WritableStream.prototype.write enforces a brand check 
PASS WritableStream.prototype.close enforces a brand check