Migrate to C++17 and misc code cleanups

Change-Id: I6b63385c92361a7ef5803d2bfd00f39c77e88d34
diff --git a/tests/repo-storage-fixture.hpp b/tests/repo-storage-fixture.hpp
index 9a82169..f573736 100644
--- a/tests/repo-storage-fixture.hpp
+++ b/tests/repo-storage-fixture.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
- * Copyright (c) 2018,  Regents of the University of California.
+/*
+ * Copyright (c) 2018-2022, Regents of the University of California.
  *
  * This file is part of NDN repo-ng (Next generation of NDN repository).
  * See AUTHORS.md for complete list of repo-ng authors and contributors.
@@ -21,12 +21,11 @@
 #define REPO_TESTS_REPO_STORAGE_FIXTURE_HPP
 
 #include "storage/repo-storage.hpp"
+#include "storage/sqlite-storage.hpp"
 
 #include <boost/filesystem.hpp>
-#include <boost/test/unit_test.hpp>
 
-namespace repo {
-namespace tests {
+namespace repo::tests {
 
 class RepoStorageFixture
 {
@@ -42,13 +41,11 @@
     boost::filesystem::remove_all(boost::filesystem::path("unittestdb"));
   }
 
-
 public:
   std::shared_ptr<Storage> store;
   std::shared_ptr<RepoStorage> handle;
 };
 
-} // namespace tests
-} // namespace repo
+} // namespace repo::tests
 
 #endif // REPO_TESTS_REPO_STORAGE_FIXTURE_HPP