
FAIL controller.error() should error the stream Can't find variable: WritableStream
FAIL controller.error() on erroring stream should not throw Can't find variable: WritableStream
FAIL surplus calls to controller.error() should be a no-op Can't find variable: WritableStream
FAIL controller.error() on errored stream should not throw Can't find variable: WritableStream
FAIL controller.error() on closed stream should not throw Can't find variable: WritableStream