net/http/internal/http2: remove TestTransportGroupsPendingDials

This test exercises dials in the client connection pool inside
http2.Transport, but in the merged-into-std world dials are
always handled by the net/http.Transport.

For #67810

Change-Id: Ic047ec3628c48116f1eda3c145bf5a566a6a6964
Reviewed-on: https://go-review.googlesource.com/c/go/+/751309
Reviewed-by: Nicholas Husin <nsh@golang.org>
Reviewed-by: Nicholas Husin <husin@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Damien Neil <dneil@google.com>

src/net/http/internal/http2/transport_test.go

@@ -479,77 +479,6 @@ func testTransportGetGotConnHooks(t *testing.T, useClient bool) {
 	}
 }
 
-type testNetConn struct {
-	net.Conn
-	closed  bool
-	onClose func()
-}
-
-func (c *testNetConn) Close() error {
-	if !c.closed {
-		// We can call Close multiple times on the same net.Conn.
-		c.onClose()
-	}
-	c.closed = true
-	return c.Conn.Close()
-}
-
-// Tests that the Transport only keeps one pending dial open per destination address.
-// https://golang.org/issue/13397
-func TestTransportGroupsPendingDials(t *testing.T) {
-	ts := newTestServer(t, func(w http.ResponseWriter, r *http.Request) {
-	})
-	var (
-		mu         sync.Mutex
-		dialCount  int
-		closeCount int
-	)
-	tr := &Transport{
-		TLSClientConfig: tlsConfigInsecure,
-		DialTLS: func(network, addr string, cfg *tls.Config) (net.Conn, error) {
-			mu.Lock()
-			dialCount++
-			mu.Unlock()
-			c, err := tls.Dial(network, addr, cfg)
-			return &testNetConn{
-				Conn: c,
-				onClose: func() {
-					mu.Lock()
-					closeCount++
-					mu.Unlock()
-				},
-			}, err
-		},
-	}
-	defer tr.CloseIdleConnections()
-	var wg sync.WaitGroup
-	for i := 0; i < 10; i++ {
-		wg.Add(1)
-		go func() {
-			defer wg.Done()
-			req, err := http.NewRequest("GET", ts.URL, nil)
-			if err != nil {
-				t.Error(err)
-				return
-			}
-			res, err := tr.RoundTrip(req)
-			if err != nil {
-				t.Error(err)
-				return
-			}
-			res.Body.Close()
-		}()
-	}
-	wg.Wait()
-	tr.CloseIdleConnections()
-	if dialCount != 1 {
-		t.Errorf("saw %d dials; want 1", dialCount)
-	}
-	if closeCount != 1 {
-		t.Errorf("saw %d closes; want 1", closeCount)
-	}
-}
-
 func TestTransportAbortClosesPipes(t *testing.T) {
 	shutdown := make(chan struct{})
 	ts := newTestServer(t,