add test for quote using

tests/test_quote.sh

+#!/bin/sh
+
+# see libshell
+. shell-quote
+
+test1()
+{
+	echo "run with \'$@\'"
+	echo 1 - $1
+	echo 2 - $2
+	echo 3 - $3
+	test "$2" = "test string" || echo ERROR with $2
+}
+
+func()
+{
+	#test1 "$(quote_shell "$@")"
+	cmd="$(quote_shell "$@")"
+	test1 "$cmd"
+	test1 "$@"
+	test1 $@
+}
+
+func -m "test string"