Move BOOST_CONCEPT_ASSERT to unit tests where possible

Change-Id: I0c6ae494eb7be4ab2ff422ba6d866ead9e75f4eb
diff --git a/tests/unit/signature-info.t.cpp b/tests/unit/signature-info.t.cpp
index 6924a07..d538217 100644
--- a/tests/unit/signature-info.t.cpp
+++ b/tests/unit/signature-info.t.cpp
@@ -28,6 +28,13 @@
 namespace ndn {
 namespace tests {
 
+BOOST_CONCEPT_ASSERT((boost::EqualityComparable<SignatureInfo>));
+BOOST_CONCEPT_ASSERT((WireEncodable<SignatureInfo>));
+BOOST_CONCEPT_ASSERT((WireEncodableWithEncodingBuffer<SignatureInfo>));
+BOOST_CONCEPT_ASSERT((WireDecodable<SignatureInfo>));
+static_assert(std::is_convertible_v<SignatureInfo::Error*, tlv::Error*>,
+              "SignatureInfo::Error must inherit from tlv::Error");
+
 BOOST_AUTO_TEST_SUITE(TestSignatureInfo)
 
 BOOST_AUTO_TEST_CASE(Constructor)