tests: update test files with latest ndn-cxx and fix a bug in database-fixture

refs: #4966
Change-Id: I34d933c6569d209eef6bd49f6504163b81fe774a
diff --git a/tests/unit-tests/dummy-test.t.cpp b/tests/unit-tests/dummy-test.t.cpp
index 70d3f50..0992583 100644
--- a/tests/unit-tests/dummy-test.t.cpp
+++ b/tests/unit-tests/dummy-test.t.cpp
@@ -18,7 +18,8 @@
  * See AUTHORS.md for complete list of ndncert authors and contributors.
  */
 
-#include "test-common.hpp"
+#include "identity-management-fixture.hpp"
+#include "boost-test.hpp"
 
 namespace ndn {
 namespace ndncert {