add an integration test with random RTTs

fixes #233

integrationtests/random_rtt_test.go

@@ -0,0 +1,67 @@
+package integrationtests
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"os/exec"
+	"runtime"
+	"strconv"
+	"time"
+
+	_ "github.com/lucas-clemente/quic-clients" // download clients
+	"github.com/lucas-clemente/quic-go/integrationtests/proxy"
+	"github.com/lucas-clemente/quic-go/protocol"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	. "github.com/onsi/gomega/gexec"
+)
+
+var _ = Describe("Random RTT", func() {
+	var rttProxy *proxy.UDPProxy
+
+	runRTTTest := func(minRtt, maxRtt time.Duration, version protocol.VersionNumber) {
+		proxyPort := 12345
+
+		clientPath := fmt.Sprintf(
+			"%s/src/github.com/lucas-clemente/quic-clients/client-%s-debug",
+			os.Getenv("GOPATH"),
+			runtime.GOOS,
+		)
+
+		iPort, _ := strconv.Atoi(port)
+		var err error
+		rttProxy, err = proxy.NewUDPProxy(proxyPort, "localhost", iPort, nil, nil, minRtt, maxRtt)
+		Expect(err).ToNot(HaveOccurred())
+
+		command := exec.Command(
+			clientPath,
+			"--quic-version="+strconv.Itoa(int(version)),
+			"--host=127.0.0.1",
+			"--port="+strconv.Itoa(proxyPort),
+			"https://quic.clemente.io/data",
+		)
+
+		session, err := Start(command, nil, GinkgoWriter)
+		Expect(err).NotTo(HaveOccurred())
+		defer session.Kill()
+		Eventually(session, 4).Should(Exit(0))
+		Expect(bytes.Contains(session.Out.Contents(), data)).To(BeTrue())
+	}
+
+	AfterEach(func() {
+		rttProxy.Stop()
+		time.Sleep(time.Millisecond)
+	})
+
+	for i := range protocol.SupportedVersions {
+		version := protocol.SupportedVersions[i]
+
+		Context(fmt.Sprintf("with quic version %d", version), func() {
+			It("gets a file a random RTT between 10ms and 30ms", func() {
+				runRTTTest(10*time.Millisecond, 30*time.Millisecond, version)
+			})
+		})
+	}
+})