strongdef: add trivial instantiation test

Makefile.am

@@ -445,6 +445,7 @@ TEST_BIN = 			\
     test/sha2			\
     test/signal			\
     test/stringid		\
+    test/strongdef		\
     test/tuple			\
     test/uri			\
     test/vector			\

test/strongdef.cpp

@@ -0,0 +1,18 @@
+#include "tap.hpp"
+#include "strongdef.hpp"
+
+using util::strongdef;
+
+
+int
+main (void)
+{
+    util::TAP::logger tap;
+    
+    // These tests are less about functional testing, and more about link testing.
+    strongdef<unsigned> fortytwo (42u);
+    tap.expect_eq (fortytwo.data, 42u, "raw data equality");
+    tap.expect_eq (fortytwo,      42u, "passthrough equality");
+
+    return tap.status ();
+}