crypto/tls: fix TestVerifyHostnameResumed

In TLS 1.3 session tickets are delivered after the handshake, and it
looks like now the Google servers wait until the first flight of data to
send them (or our timeout is too low). Cause some data to be sent so we
can avoid the guessing game.

Fixes #32090

Change-Id: I54af4acb3a89cc70c9e14a5dfe18a44c29a841a7
Reviewed-on: https://go-review.googlesource.com/c/go/+/177877Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/crypto/tls/tls_test.go

@@ -372,7 +372,9 @@ func testVerifyHostnameResumed(t *testing.T, version uint16) {
 		ClientSessionCache: NewLRUClientSessionCache(32),
 	}
 	for i := 0; i < 2; i++ {
-		c, err := Dial("tcp", "mail.google.com:https", config)
+		c, err := DialWithDialer(&net.Dialer{
+			Timeout: 10 * time.Second,
+		}, "tcp", "mail.google.com:https", config)
 		if err != nil {
 			t.Fatalf("Dial #%d: %v", i, err)
 		}
@@ -389,12 +391,13 @@ func testVerifyHostnameResumed(t *testing.T, version uint16) {
 		if err := c.VerifyHostname("mail.google.com"); err != nil {
 			t.Fatalf("verify mail.google.com #%d: %v", i, err)
 		}
-		// Give the client a chance to read the server session tickets.
-		c.SetReadDeadline(time.Now().Add(500 * time.Millisecond))
+		// Have the server send some data so session tickets are delivered.
+		c.SetDeadline(time.Now().Add(5 * time.Second))
+		if _, err := io.WriteString(c, "HEAD / HTTP/1.0\n\n"); err != nil {
+			t.Fatal(err)
+		}
 		if _, err := c.Read(make([]byte, 1)); err != nil {
-			if err, ok := err.(net.Error); !ok || !err.Timeout() {
-				t.Fatal(err)
-			}
+			t.Fatal(err)
 		}
 		c.Close()
 	}