use new random data for each integration test

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
+}