// META: global=window,worker 'use strict'; promise_test(t => { let isDone = false; const ws = new WritableStream( { write() { return new Promise(resolve => { t.step_timeout(() => { isDone = true; resolve(); }, 200); }); }, close() { assert_true(isDone, 'close is only called once the promise has been resolved'); } }, new ByteLengthQueuingStrategy({ highWaterMark: 1024 * 16 }) ); const writer = ws.getWriter(); writer.write({ byteLength: 1024 }); return writer.close(); }, 'Closing a writable stream with in-flight writes below the high water mark delays the close call properly');