exe: add trivial test case

Makefile.am

@@ -392,6 +392,7 @@ TEST_BIN = 			\
     test/crypto/tea		\
     test/crypto/xtea		\
     test/crypto/xxtea		\
+    test/exe			\
     test/extent			\
     test/fixed			\
     test/float			\

test/exe.cpp

@@ -0,0 +1,12 @@
+#include "./exe.hpp"
+#include "./tap.hpp"
+
+#include <iostream>
+
+int
+main (void)
+{
+	util::TAP::logger tap;
+	tap.expect_eq (util::image_path ().stem (), "exe", "identify executable path");
+	return tap.status ();
+}