// This tests TimeoutReader package swift import (	"io"	"io/ioutil"	"sync"	"testing"	"time") // An io.ReadCloser for testingtype testReader struct {	sync.Mutex	n      int	delay  time.Duration	closed bool} // Returns n bytes with at time.Duration delayfunc newTestReader(n int, delay time.Duration) *testReader {	return &testReader{		n:     n,		delay: delay,	}} // Returns 1 byte at a time after delayfunc (t *testReader) Read(p []byte) (n int, err error) {	if t.n <= 0 {		return 0, io.EOF	}	time.Sleep(t.delay)	p[0] = 'A'	t.Lock()	t.n--	t.Unlock()	return 1, nil} // Close the channelfunc (t *testReader) Close() error {	t.Lock()	t.closed = true	t.Unlock()	return nil} func TestTimeoutReaderNoTimeout(t *testing.T) {	test := newTestReader(3, 10*time.Millisecond)	cancelled := false	cancel := func() {		cancelled = true	}	tr := newTimeoutReader(test, 100*time.Millisecond, cancel)	b, err := ioutil.ReadAll(tr)	if err != nil || string(b) != "AAA" {		t.Fatalf("Bad read %s %s", err, b)	}	if cancelled {		t.Fatal("Cancelled when shouldn't have been")	}	if test.n != 0 {		t.Fatal("Didn't read all")	}	if test.closed {		t.Fatal("Shouldn't be closed")	}	tr.Close()	if !test.closed {		t.Fatal("Should be closed")	}} func TestTimeoutReaderTimeout(t *testing.T) {	// Return those bytes slowly so we get an idle timeout	test := newTestReader(3, 100*time.Millisecond)	cancelled := false	cancel := func() {		cancelled = true	}	tr := newTimeoutReader(test, 10*time.Millisecond, cancel)	_, err := ioutil.ReadAll(tr)	if err != TimeoutError {		t.Fatal("Expecting TimeoutError, got", err)	}	if !cancelled {		t.Fatal("Not cancelled when should have been")	}	test.Lock()	n := test.n	test.Unlock()	if n == 0 {		t.Fatal("Read all")	}	if n != 3 {		t.Fatal("Didn't read any")	}	if test.closed {		t.Fatal("Shouldn't be closed")	}	tr.Close()	if !test.closed {		t.Fatal("Should be closed")	}}