message: Add class for object-path and signatures

Change-Id: I1ca54ecc5d4033c41738bd224399f80b95094430
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/test/message/native_types.cpp b/test/message/native_types.cpp
new file mode 100644
index 0000000..1ee3dee
--- /dev/null
+++ b/test/message/native_types.cpp
@@ -0,0 +1,13 @@
+#include <cassert>
+#include <sdbusplus/message.hpp>
+
+int main()
+{
+    std::string s1 = sdbusplus::message::object_path("/asdf/");
+    sdbusplus::message::object_path p = std::move(s1);
+
+    std::string s2 = sdbusplus::message::signature("iii");
+    sdbusplus::message::signature sig = s2;
+
+    return 0;
+}