NO-JIRA Add two forgotten test files to the project (#296)

diff --git a/c/tests/CMakeLists.txt b/c/tests/CMakeLists.txt
index 6db120f..1456c93 100644
--- a/c/tests/CMakeLists.txt
+++ b/c/tests/CMakeLists.txt
@@ -58,6 +58,8 @@
   add_c_test(c-core-test
     pn_test_test.cpp
     object_test.cpp
+    event_test.cpp
+    message_test.cpp
     condition_test.cpp
     connection_driver_test.cpp
     data_test.cpp