diff --git a/tests/unit/util/logging.t.cpp b/tests/unit/util/logging.t.cpp
index 821e11e..02da03a 100644
--- a/tests/unit/util/logging.t.cpp
+++ b/tests/unit/util/logging.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).
  *
@@ -162,7 +162,7 @@
 NDN_LOG_MEMBER_INIT_SPECIALIZED((ClassTemplateWithLogger<int, double>), ndn.util.tests.Specialized1);
 NDN_LOG_MEMBER_INIT_SPECIALIZED((ClassTemplateWithLogger<int, std::string>), ndn.util.tests.Specialized2);
 
-const time::microseconds LOG_SYSTIME(1468108800311239LL);
+constexpr time::microseconds LOG_SYSTIME{1468108800311239LL};
 const std::string LOG_SYSTIME_STR("1468108800.311239");
 
 class LoggingFixture : public ndn::tests::ClockFixture
@@ -177,7 +177,7 @@
     Logging::setDestination(os, true);
   }
 
-  ~LoggingFixture()
+  ~LoggingFixture() override
   {
     Logging::get().setLevelImpl(m_oldEnabledLevel);
     Logging::setDestination(m_oldDestination);
diff --git a/tests/unit/util/string-helper.t.cpp b/tests/unit/util/string-helper.t.cpp
index e3229e5..3816fab 100644
--- a/tests/unit/util/string-helper.t.cpp
+++ b/tests/unit/util/string-helper.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).
  *
@@ -182,8 +182,7 @@
   BOOST_CHECK_EQUAL(escape(":/?#[]@"), "%3A%2F%3F%23%5B%5D%40");
 
   output_test_stream os;
-  const char str[] = "\x01\x2a\x3b\xc4\xde\xfa\xb5\xcd\xef";
-  escape(os, str, std::strlen(str));
+  escape(os, "\x01\x2a\x3b\xc4\xde\xfa\xb5\xcd\xef");
   BOOST_CHECK(os.is_equal("%01%2A%3B%C4%DE%FA%B5%CD%EF"));
 }
 
@@ -196,8 +195,7 @@
   BOOST_CHECK_EQUAL(unescape("Bad %a"), "Bad %a");
 
   output_test_stream os;
-  const char str[] = "%01%2a%3B%c4%de%fA%B5%Cd%EF";
-  unescape(os, str, std::strlen(str));
+  unescape(os, "%01%2a%3B%c4%de%fA%B5%Cd%EF");
   BOOST_CHECK(os.is_equal("\x01\x2a\x3b\xc4\xde\xfa\xb5\xcd\xef"));
 }