Move BOOST_CONCEPT_ASSERT to unit tests where possible

Change-Id: I0c6ae494eb7be4ab2ff422ba6d866ead9e75f4eb
diff --git a/tests/unit/link.t.cpp b/tests/unit/link.t.cpp
index fe4b45c..106541a 100644
--- a/tests/unit/link.t.cpp
+++ b/tests/unit/link.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2013-2022 Regents of the University of California.
+ * Copyright (c) 2013-2023 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
@@ -26,6 +26,13 @@
 namespace ndn {
 namespace tests {
 
+BOOST_CONCEPT_ASSERT((boost::EqualityComparable<Link>));
+BOOST_CONCEPT_ASSERT((WireEncodable<Link>));
+BOOST_CONCEPT_ASSERT((WireEncodableWithEncodingBuffer<Link>));
+BOOST_CONCEPT_ASSERT((WireDecodable<Link>));
+static_assert(std::is_convertible_v<Link::Error*, Data::Error*>,
+              "Link::Error should inherit from Data::Error");
+
 BOOST_AUTO_TEST_SUITE(TestLink)
 
 const uint8_t GOOD_LINK[] = {