Use Boost.Operators in more places

Change-Id: I7024c3e7d4c30c99ec7a895d484f227cb60fb356
diff --git a/tests/unit/interest.t.cpp b/tests/unit/interest.t.cpp
index bd6e302..73b7bef 100644
--- a/tests/unit/interest.t.cpp
+++ b/tests/unit/interest.t.cpp
@@ -31,6 +31,7 @@
 BOOST_CONCEPT_ASSERT((WireDecodable<Interest>));
 static_assert(std::is_convertible_v<Interest::Error*, tlv::Error*>,
               "Interest::Error must inherit from tlv::Error");
+BOOST_CONCEPT_ASSERT((boost::EqualityComparable<Interest::Nonce>));
 
 BOOST_AUTO_TEST_SUITE(TestInterest)