diff --git a/integrationtests/chrome_test.go b/integrationtests/chrome_test.go
index 77203a68..dce83196 100644
--- a/integrationtests/chrome_test.go
+++ b/integrationtests/chrome_test.go
@@ -119,10 +119,11 @@ var _ = Describe("Chrome tests", func() {
 			}, 10)
 
 			It("downloads a small file", func() {
+				dataMan.GenerateData(dataLen)
 				err := wd.Get("https://quic.clemente.io/data")
 				Expect(err).NotTo(HaveOccurred())
 				Eventually(func() int { return getDownloadSize("data") }, 30, 0.1).Should(Equal(dataLen))
-				Expect(getDownloadMD5("data")).To(Equal(dataMD5))
+				Expect(getDownloadMD5("data")).To(Equal(dataMan.GetMD5()))
 			}, 60)
 		})
 	}
diff --git a/integrationtests/data_manager.go b/integrationtests/data_manager.go
new file mode 100644
index 00000000..ffb64664
--- /dev/null
+++ b/integrationtests/data_manager.go
@@ -0,0 +1,30 @@
+package integrationtests
+
+import (
+	"crypto/md5"
+	"crypto/rand"
+)
+
+type dataManager struct {
+	data []byte
+	md5  []byte
+}
+
+func (m *dataManager) GenerateData(len int) error {
+	m.data = make([]byte, len)
+	_, err := rand.Read(m.data)
+	if err != nil {
+		return err
+	}
+	sum := md5.Sum(m.data)
+	m.md5 = sum[:]
+	return nil
+}
+
+func (m *dataManager) GetData() []byte {
+	return m.data
+}
+
+func (m *dataManager) GetMD5() []byte {
+	return m.md5
+}
diff --git a/integrationtests/data_manager_test.go b/integrationtests/data_manager_test.go
new file mode 100644
index 00000000..b9baef01
--- /dev/null
+++ b/integrationtests/data_manager_test.go
@@ -0,0 +1,28 @@
+package integrationtests
+
+import (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Data Manager", func() {
+	dm := dataManager{}
+
+	It("generates data", func() {
+		dm.GenerateData(1337)
+		data := dm.GetData()
+		Expect(data).To(HaveLen(1337))
+		Expect(dm.GetMD5()).To(HaveLen(16))
+	})
+
+	It("generates random data", func() {
+		dm.GenerateData(1337)
+		data1 := dm.GetData()
+		md51 := dm.GetMD5()
+		dm.GenerateData(1337)
+		data2 := dm.GetData()
+		md52 := dm.GetMD5()
+		Expect(data1).ToNot(Equal(data2))
+		Expect(md51).ToNot(Equal(md52))
+	})
+})
diff --git a/integrationtests/drop_test.go b/integrationtests/drop_test.go
index c1c4c55d..49558c4e 100644
--- a/integrationtests/drop_test.go
+++ b/integrationtests/drop_test.go
@@ -20,6 +20,10 @@ import (
 )
 
 var _ = PDescribe("Drop Proxy", func() {
+	BeforeEach(func() {
+		dataMan.GenerateData(dataLen)
+	})
+
 	var dropproxy *proxy.UDPProxy
 
 	runDropTest := func(incomingPacketDropper, outgoingPacketDropper proxy.DropCallback, version protocol.VersionNumber) {
@@ -49,7 +53,7 @@ var _ = PDescribe("Drop Proxy", func() {
 		Expect(err).NotTo(HaveOccurred())
 		defer session.Kill()
 		Eventually(session, 20).Should(Exit(0))
-		Expect(bytes.Contains(session.Out.Contents(), data)).To(BeTrue())
+		Expect(bytes.Contains(session.Out.Contents(), dataMan.GetData())).To(BeTrue())
 	}
 
 	AfterEach(func() {
diff --git a/integrationtests/integration_test.go b/integrationtests/integration_test.go
index fa9d45ca..150ad25a 100644
--- a/integrationtests/integration_test.go
+++ b/integrationtests/integration_test.go
@@ -20,6 +20,10 @@ import (
 )
 
 var _ = Describe("Integration tests", func() {
+	BeforeEach(func() {
+		dataMan.GenerateData(dataLen)
+	})
+
 	clientPath := fmt.Sprintf(
 		"%s/src/github.com/lucas-clemente/quic-clients/client-%s-debug",
 		os.Getenv("GOPATH"),
@@ -61,7 +65,7 @@ var _ = Describe("Integration tests", func() {
 				Expect(session.Out).To(Say("Response:\nheaders: HTTP/1.1 200\nstatus: 200\n\nbody: foo\n"))
 			})
 
-			It("gets a large file", func() {
+			It("gets a file", func() {
 				command := exec.Command(
 					clientPath,
 					"--quic-version="+strconv.Itoa(int(version)),
@@ -73,10 +77,10 @@ var _ = Describe("Integration tests", func() {
 				Expect(err).NotTo(HaveOccurred())
 				defer session.Kill()
 				Eventually(session, 2).Should(Exit(0))
-				Expect(bytes.Contains(session.Out.Contents(), data)).To(BeTrue())
+				Expect(bytes.Contains(session.Out.Contents(), dataMan.GetData())).To(BeTrue())
 			})
 
-			It("gets many large files in parallel", func() {
+			It("gets many copies of a file in parallel", func() {
 				wg := sync.WaitGroup{}
 				for i := 0; i < 10; i++ {
 					wg.Add(1)
@@ -94,7 +98,7 @@ var _ = Describe("Integration tests", func() {
 						Expect(err).NotTo(HaveOccurred())
 						defer session.Kill()
 						Eventually(session, 10).Should(Exit(0))
-						Expect(bytes.Contains(session.Out.Contents(), data)).To(BeTrue())
+						Expect(bytes.Contains(session.Out.Contents(), dataMan.GetData())).To(BeTrue())
 					}()
 				}
 				wg.Wait()
diff --git a/integrationtests/integrationtests_suite_test.go b/integrationtests/integrationtests_suite_test.go
index a8452967..ba994b6f 100644
--- a/integrationtests/integrationtests_suite_test.go
+++ b/integrationtests/integrationtests_suite_test.go
@@ -2,8 +2,6 @@ package integrationtests
 
 import (
 	"bytes"
-	"crypto/md5"
-	"crypto/rand"
 	"encoding/hex"
 	"fmt"
 	"io"
@@ -32,8 +30,7 @@ const (
 
 var (
 	server  *h2quic.Server
-	data    []byte
-	dataMD5 []byte
+	dataMan dataManager
 	port    string
 
 	docker *gexec.Session
@@ -59,11 +56,6 @@ var _ = AfterSuite(func() {
 
 func setupHTTPHandlers() {
 	defer GinkgoRecover()
-	data = make([]byte, dataLen)
-	_, err := rand.Read(data)
-	Expect(err).NotTo(HaveOccurred())
-	sum := md5.Sum(data)
-	dataMD5 = sum[:]
 
 	http.HandleFunc("/hello", func(w http.ResponseWriter, r *http.Request) {
 		defer GinkgoRecover()
@@ -73,6 +65,8 @@ func setupHTTPHandlers() {
 
 	http.HandleFunc("/data", func(w http.ResponseWriter, r *http.Request) {
 		defer GinkgoRecover()
+		data := dataMan.GetData()
+		Expect(data).ToNot(HaveLen(0))
 		_, err := w.Write(data)
 		Expect(err).NotTo(HaveOccurred())
 	})
diff --git a/integrationtests/random_rtt_test.go b/integrationtests/random_rtt_test.go
index 647cf4fe..e4d6a4b4 100644
--- a/integrationtests/random_rtt_test.go
+++ b/integrationtests/random_rtt_test.go
@@ -19,6 +19,10 @@ import (
 )
 
 var _ = Describe("Random RTT", func() {
+	BeforeEach(func() {
+		dataMan.GenerateData(dataLen)
+	})
+
 	var rttProxy *proxy.UDPProxy
 
 	runRTTTest := func(minRtt, maxRtt time.Duration, version protocol.VersionNumber) {
@@ -47,7 +51,7 @@ var _ = Describe("Random RTT", func() {
 		Expect(err).NotTo(HaveOccurred())
 		defer session.Kill()
 		Eventually(session, 4).Should(Exit(0))
-		Expect(bytes.Contains(session.Out.Contents(), data)).To(BeTrue())
+		Expect(bytes.Contains(session.Out.Contents(), dataMan.GetData())).To(BeTrue())
 	}
 
 	AfterEach(func() {
diff --git a/integrationtests/rtt_test.go b/integrationtests/rtt_test.go
index a55a5b33..e0a4836f 100644
--- a/integrationtests/rtt_test.go
+++ b/integrationtests/rtt_test.go
@@ -19,6 +19,10 @@ import (
 )
 
 var _ = Describe("non-zero RTT", func() {
+	BeforeEach(func() {
+		dataMan.GenerateData(dataLen)
+	})
+
 	var rttProxy *proxy.UDPProxy
 
 	runRTTTest := func(rtt time.Duration, version protocol.VersionNumber) {
@@ -47,7 +51,7 @@ var _ = Describe("non-zero RTT", func() {
 		Expect(err).NotTo(HaveOccurred())
 		defer session.Kill()
 		Eventually(session, 4).Should(Exit(0))
-		Expect(bytes.Contains(session.Out.Contents(), data)).To(BeTrue())
+		Expect(bytes.Contains(session.Out.Contents(), dataMan.GetData())).To(BeTrue())
 	}
 
 	AfterEach(func() {