Run TestPionE2ESimpleED25519 only on Go 1.13

Conditionally build TestPionE2ESimpleED25519 in e2e_v113_test.go.
Once Go 1.12 is deprecated, move this test to e2e_test.go.

e2e/e2e_test.go

@@ -1,7 +1,6 @@
 package e2e
 
 import (
-	"crypto/rand"
 	"crypto/tls"
 	"errors"
 	"io"
@@ -11,8 +10,6 @@ import (
 	"testing"
 	"time"
 
-	"golang.org/x/crypto/ed25519"
-
 	"github.com/pion/dtls/v2"
 	"github.com/pion/transport/test"
 )
@@ -212,40 +209,6 @@ func TestPionE2ESimple(t *testing.T) {
 	}
 }
 
-func TestPionE2ESimpleED25519(t *testing.T) {
-	lim := test.TimeOut(time.Second * 30)
-	defer lim.Stop()
-
-	report := test.CheckRoutines(t)
-	defer report()
-
-	serverPort := randomPort(t)
-
-	for _, cipherSuite := range []dtls.CipherSuiteID{
-		dtls.TLS_ECDHE_ECDSA_WITH_AES_128_CCM,
-		dtls.TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8,
-		dtls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
-		dtls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
-	} {
-		_, key, err := ed25519.GenerateKey(rand.Reader)
-		if err != nil {
-			t.Fatal(err)
-		}
-		cert, err := dtls.SelfSign(key)
-		if err != nil {
-			t.Fatal(err)
-		}
-
-		cfg := &dtls.Config{
-			Certificates:       []tls.Certificate{cert},
-			CipherSuites:       []dtls.CipherSuiteID{cipherSuite},
-			InsecureSkipVerify: true,
-			ConnectTimeout:     dtls.ConnectTimeoutOption(5 * time.Second),
-		}
-		assertE2ECommunication(cfg, cfg, serverPort, t)
-	}
-}
-
 func TestPionE2ESimplePSK(t *testing.T) {
 	lim := test.TimeOut(time.Second * 30)
 	defer lim.Stop()

e2e/e2e_v113_test.go

@@ -0,0 +1,52 @@
+// +build go1.13
+
+package e2e
+
+import (
+	"crypto/rand"
+	"crypto/tls"
+	"testing"
+	"time"
+
+	"golang.org/x/crypto/ed25519"
+
+	"github.com/pion/dtls/v2"
+	"github.com/pion/transport/test"
+)
+
+// ED25519 is not supported in Go 1.12 crypto/x509.
+// Once Go 1.12 is deprecated, move this test to e2e_test.go.
+
+func TestPionE2ESimpleED25519(t *testing.T) {
+	lim := test.TimeOut(time.Second * 30)
+	defer lim.Stop()
+
+	report := test.CheckRoutines(t)
+	defer report()
+
+	serverPort := randomPort(t)
+
+	for _, cipherSuite := range []dtls.CipherSuiteID{
+		dtls.TLS_ECDHE_ECDSA_WITH_AES_128_CCM,
+		dtls.TLS_ECDHE_ECDSA_WITH_AES_128_CCM_8,
+		dtls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
+		dtls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
+	} {
+		_, key, err := ed25519.GenerateKey(rand.Reader)
+		if err != nil {
+			t.Fatal(err)
+		}
+		cert, err := dtls.SelfSign(key)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		cfg := &dtls.Config{
+			Certificates:       []tls.Certificate{cert},
+			CipherSuites:       []dtls.CipherSuiteID{cipherSuite},
+			InsecureSkipVerify: true,
+			ConnectTimeout:     dtls.ConnectTimeoutOption(5 * time.Second),
+		}
+		assertE2ECommunication(cfg, cfg, serverPort, t)
+	}
+}