correctly handle errors when creating a new gQUIC key exchange

internal/handshake/ephermal_cache_test.go

@@ -3,7 +3,6 @@ package handshake
 import (
 	"time"
 
-	"github.com/lucas-clemente/quic-go/internal/crypto"
 	"github.com/lucas-clemente/quic-go/internal/protocol"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
@@ -11,9 +10,11 @@ import (
 
 var _ = Describe("Ephermal KEX", func() {
 	It("has a consistent KEX", func() {
-		kex1 := getEphermalKEX()
+		kex1, err := getEphermalKEX()
+		Expect(err).ToNot(HaveOccurred())
 		Expect(kex1).ToNot(BeNil())
-		kex2 := getEphermalKEX()
+		kex2, err := getEphermalKEX()
+		Expect(err).ToNot(HaveOccurred())
 		Expect(kex2).ToNot(BeNil())
 		Expect(kex1).To(Equal(kex2))
 	})
@@ -23,8 +24,12 @@ var _ = Describe("Ephermal KEX", func() {
 		defer func() {
 			kexLifetime = protocol.EphermalKeyLifetime
 		}()
-		kex := getEphermalKEX()
+		kex, err := getEphermalKEX()
+		Expect(err).ToNot(HaveOccurred())
 		Expect(kex).ToNot(BeNil())
-		Eventually(func() crypto.KeyExchange { return getEphermalKEX() }).ShouldNot(Equal(kex))
+		time.Sleep(kexLifetime)
+		kex2, err := getEphermalKEX()
+		Expect(err).ToNot(HaveOccurred())
+		Expect(kex2).ToNot(Equal(kex))
 	})
 })