diff --git a/test/gengc.lua b/test/gengc.lua
new file mode 100644
index 0000000..b919fd4
--- /dev/null
+++ b/test/gengc.lua
@@ -0,0 +1,6 @@
+if T == nil then
+	(Message or print)('\n >>> testC not active: \z
+							   skipping some generational tests <<<\n')
+	print 'OK'
+	return
+  end
diff --git a/test/tokenizerString.lua b/test/tokenizerString.lua
index a146bfa..abce46a 100644
--- a/test/tokenizerString.lua
+++ b/test/tokenizerString.lua
@@ -10,3 +10,4 @@
 abc" "123" "sdlfkgj<3" "asldkfj" zzz "" "" "" "" "" "fasd!" "afd" "" "as" zzzz
 
 "\xf7\xAff\x43"
+"\u{fa4}\u{1234}\u{12000}\u{123}"