Switch to std::filesystem

Drop the dependency on Boost.Filesystem

Change-Id: I5d6f6fe38cd0cf1c6996221188fa63db146dc9f9
diff --git a/tests/unit/util/config-file.t.cpp b/tests/unit/util/config-file.t.cpp
index ab8f212..eac5f21 100644
--- a/tests/unit/util/config-file.t.cpp
+++ b/tests/unit/util/config-file.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2013-2023 Regents of the University of California.
+ * Copyright (c) 2013-2024 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
@@ -24,7 +24,6 @@
 #include "tests/boost-test.hpp"
 #include "tests/unit/test-home-env-saver.hpp"
 
-#include <boost/filesystem/operations.hpp>
 #include <cstdlib>
 
 namespace ndn::tests {
@@ -34,15 +33,13 @@
 
 BOOST_AUTO_TEST_CASE(Parse)
 {
-  namespace fs = boost::filesystem;
-
   setenv("TEST_HOME", "tests/unit/util/config-file-home", 1);
 
-  fs::path homePath(fs::absolute(std::getenv("TEST_HOME")));
+  auto homePath = std::filesystem::absolute(std::getenv("TEST_HOME"));
   homePath /= ".ndn/client.conf";
 
   ConfigFile config;
-  BOOST_REQUIRE_EQUAL(config.getPath(), homePath);
+  BOOST_CHECK_EQUAL(config.getPath(), homePath);
 
   const ConfigFile::Parsed& parsed = config.getParsedConfiguration();
   BOOST_CHECK_EQUAL(parsed.get<std::string>("a"), "/path/to/nowhere");
@@ -53,14 +50,14 @@
 {
   setenv("TEST_HOME", "tests/unit/util/does/not/exist", 1);
 
-  BOOST_CHECK_NO_THROW(ConfigFile config);
+  BOOST_CHECK_NO_THROW(ConfigFile{});
 }
 
 BOOST_AUTO_TEST_CASE(ParseMalformed)
 {
   setenv("TEST_HOME", "tests/unit/util/config-file-malformed-home", 1);
 
-  BOOST_CHECK_THROW(ConfigFile config, ConfigFile::Error);
+  BOOST_CHECK_THROW(ConfigFile{}, ConfigFile::Error);
 }
 
 BOOST_AUTO_TEST_SUITE_END() // TestConfigFile