Benchmarks for engine/env

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)

testutils/testutils.go

@@ -1,10 +1,15 @@
 package testutils
 
 import (
+	"math/rand"
 	"testing"
 	"time"
 )
 
+const chars = "abcdefghijklmnopqrstuvwxyz" +
+	"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
+	"~!@#$%^&*()-_+={}[]\\|<,>.?/\"';:` "
+
 // Timeout calls f and waits for 100ms for it to complete.
 // If it doesn't, it causes the tests to fail.
 // t must be a valid testing context.
@@ -21,3 +26,12 @@ func Timeout(t *testing.T, f func()) {
 	case <-onDone:
 	}
 }
+
+// RandomString returns random string of specified length
+func RandomString(length int) string {
+	res := make([]byte, length)
+	for i := 0; i < length; i++ {
+		res[i] = chars[rand.Intn(len(chars))]
+	}
+	return string(res)
+}