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/crypto-helper.t.cpp b/tests/unit-tests/crypto-helper.t.cpp
index 4576942..385dbbd 100644
--- a/tests/unit-tests/crypto-helper.t.cpp
+++ b/tests/unit-tests/crypto-helper.t.cpp
@@ -19,7 +19,7 @@
  */
 
 #include "crypto-support/crypto-helper.hpp"
-#include "test-common.hpp"
+#include "identity-management-fixture.hpp"
 #include <iostream>
 
 namespace ndn {