use the quic.Config to set the QUIC version in the Chrome tests

integrationtests/chrome/chrome_suite_test.go

@@ -38,6 +38,7 @@ var (
 	nFilesUploaded     int32 // should be used atomically
 	testEndpointCalled utils.AtomicBool
 	doneCalled         utils.AtomicBool
+	version            protocol.VersionNumber
 )
 
 func TestChrome(t *testing.T) {
@@ -88,7 +89,9 @@ func init() {
 	})
 }
 
-var _ = JustBeforeEach(testserver.StartQuicServer)
+var _ = JustBeforeEach(func() {
+	testserver.StartQuicServer([]protocol.VersionNumber{version})
+})
 
 var _ = AfterEach(func() {
 	testserver.StopQuicServer()

integrationtests/chrome/chrome_test.go

@@ -11,20 +11,13 @@ import (
 
 var _ = Describe("Chrome tests", func() {
 	for i := range protocol.SupportedVersions {
-		version := protocol.SupportedVersions[i]
+		version = protocol.SupportedVersions[i]
 
 		Context(fmt.Sprintf("with quic version %d", version), func() {
-			supportedVersionsBefore := protocol.SupportedVersions
-
 			BeforeEach(func() {
 				if version == protocol.Version39 && os.Getenv("TRAVIS") == "true" {
 					Skip("The chrome version running on Travis doesn't support QUIC 39 yet.")
 				}
-				protocol.SupportedVersions = []protocol.VersionNumber{version}
-			})
-
-			AfterEach(func() {
-				protocol.SupportedVersions = supportedVersionsBefore
 			})
 
 			It("downloads a small file", func() {

integrationtests/gquic/gquic_suite_test.go

@@ -24,7 +24,9 @@ func TestIntegration(t *testing.T) {
 	RunSpecs(t, "GQuic Tests Suite")
 }
 
-var _ = JustBeforeEach(testserver.StartQuicServer)
+var _ = JustBeforeEach(func() {
+	testserver.StartQuicServer(nil)
+})
 
 var _ = AfterEach(testserver.StopQuicServer)
 

integrationtests/self/client_test.go

@@ -29,7 +29,7 @@ var _ = Describe("Client tests", func() {
 		if addr.String() != "127.0.0.1:0" {
 			Fail("quic.clemente.io does not resolve to 127.0.0.1. Consider adding it to /etc/hosts.")
 		}
-		testserver.StartQuicServer()
+		testserver.StartQuicServer(nil)
 	})
 
 	AfterEach(func() {

integrationtests/tools/testserver/server.go

@@ -7,7 +7,9 @@ import (
 	"net/http"
 	"strconv"
 
+	quic "github.com/lucas-clemente/quic-go"
 	"github.com/lucas-clemente/quic-go/h2quic"
+	"github.com/lucas-clemente/quic-go/internal/protocol"
 	"github.com/lucas-clemente/quic-go/internal/testdata"
 
 	. "github.com/onsi/ginkgo"
@@ -75,11 +77,16 @@ func GeneratePRData(l int) []byte {
 	return res
 }
 
-func StartQuicServer() {
+// StartQuicServer starts a h2quic.Server.
+// versions is a slice of supported QUIC versions. It may be nil, then all supported versions are used.
+func StartQuicServer(versions []protocol.VersionNumber) {
 	server = &h2quic.Server{
 		Server: &http.Server{
 			TLSConfig: testdata.GetTLSConfig(),
 		},
+		QuicConfig: &quic.Config{
+			Versions: versions,
+		},
 	}
 
 	addr, err := net.ResolveUDPAddr("udp", "0.0.0.0:0")