Move BOOST_CONCEPT_ASSERT to unit tests where possible

Change-Id: I0c6ae494eb7be4ab2ff422ba6d866ead9e75f4eb
diff --git a/tests/unit/security/validity-period.t.cpp b/tests/unit/security/validity-period.t.cpp
index ff0089f..dbcd47f 100644
--- a/tests/unit/security/validity-period.t.cpp
+++ b/tests/unit/security/validity-period.t.cpp
@@ -20,6 +20,7 @@
  */
 
 #include "ndn-cxx/security/validity-period.hpp"
+#include "ndn-cxx/util/concepts.hpp"
 
 #include "tests/boost-test.hpp"
 #include "tests/unit/clock-fixture.hpp"
@@ -32,6 +33,13 @@
 
 using namespace ndn::tests;
 
+BOOST_CONCEPT_ASSERT((boost::EqualityComparable<ValidityPeriod>));
+BOOST_CONCEPT_ASSERT((WireEncodable<ValidityPeriod>));
+BOOST_CONCEPT_ASSERT((WireEncodableWithEncodingBuffer<ValidityPeriod>));
+BOOST_CONCEPT_ASSERT((WireDecodable<ValidityPeriod>));
+static_assert(std::is_convertible_v<ValidityPeriod::Error*, tlv::Error*>,
+              "ValidityPeriod::Error must inherit from tlv::Error");
+
 BOOST_AUTO_TEST_SUITE(Security)
 BOOST_AUTO_TEST_SUITE(TestValidityPeriod)