added more (and better) c++ unittests

tests/unittests.cfg

@@ -484,3 +484,21 @@ dxmorg@florida.cops.gov
         | $pcp -V $vault -k -x $passwd
   expect = /Generated new secret key/
 </test>
+
+
+#
+# test the c++ api
+<test check-cpp-crypto>
+  cmd = ./cpptest 0
+  expect = /ok/
+</test>
+
+<test check-cpp-vault>
+  cmd = ./cpptest 1
+  expect = /ok/
+</test>
+
+<test check-cpp-import-pub>
+  cmd = ./cpptest 1
+  expect = /ok/
+</test>