face: UdpTransport

Change-Id: I54f43248785437cdf951d50099e46e9689962a75
Refs: #3168
diff --git a/tests/identity-management-fixture.hpp b/tests/identity-management-fixture.hpp
index 265c3bc..9774363 100644
--- a/tests/identity-management-fixture.hpp
+++ b/tests/identity-management-fixture.hpp
@@ -19,6 +19,9 @@
  * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
  */
 
+#ifndef NFD_TESTS_IDENTITY_MANAGEMENT_FIXTURE_HPP
+#define NFD_TESTS_IDENTITY_MANAGEMENT_FIXTURE_HPP
+
 #include "tests/test-common.hpp"
 #include <ndn-cxx/security/key-chain.hpp>
 #include <vector>
@@ -35,7 +38,7 @@
  * Identities added via addIdentity method are automatically deleted
  * during test teardown.
  */
-class IdentityManagementFixture : public nfd::tests::BaseFixture
+class IdentityManagementFixture : public virtual BaseFixture
 {
 public:
   IdentityManagementFixture();
@@ -54,3 +57,5 @@
 
 } // namespace tests
 } // namespace nfd
+
+#endif // NFD_TESTS_IDENTITY_MANAGEMENT_FIXTURE_HPP