internal/testutil: switch off debug if test is called TestNonVerbose

Change-Id: I71cd7cb713c7e864305ebad73a1b072395c13b27

internal/testutil/verbose.go

@@ -4,10 +4,20 @@
 
 package testutil
 
-import "flag"
+import (
+	"bytes"
+	"flag"
+	"runtime"
+)
 
 // VerboseTest returns true if the testing framework is run with -v.
 func VerboseTest() bool {
+	var buf [2048]byte
+	n := runtime.Stack(buf[:], false)
+	if bytes.Index(buf[:n], []byte("TestNonVerbose")) != -1 {
+		return false
+	}
+
 	flag := flag.Lookup("test.v")
 	return flag != nil && flag.Value.String() == "true"
 }