testBuffer_writeTo(t, size, name == "Copy")
			})
		}
	}
}

func testBuffer_writeTo(t *testing.T, chunks int, useCopy bool) {
	oldHook := poll.TestHookDidWritev
	defer func() { poll.TestHookDidWritev = oldHook }()
	var writeLog struct {
		sync.Mutex
		log []int
	}
	poll.TestHookDidWritev = func(size int) {
		writeLog.Lock()
		writeLog.log = append(writeLog.log, size)