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diff --git a/src/ceph/src/test/rgw/test_rgw_string.cc b/src/ceph/src/test/rgw/test_rgw_string.cc
new file mode 100644
index 0000000..96dc8a9
--- /dev/null
+++ b/src/ceph/src/test/rgw/test_rgw_string.cc
@@ -0,0 +1,76 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2017 Red Hat
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation. See file COPYING.
+ *
+ */
+
+#include "rgw/rgw_string.h"
+#include <gtest/gtest.h>
+
+const std::string abc{"abc"};
+const char *def{"def"}; // const char*
+char ghi_arr[] = {'g', 'h', 'i', '\0'};
+char *ghi{ghi_arr}; // char*
+constexpr boost::string_view jkl{"jkl", 3};
+#define mno "mno" // string literal (char[4])
+char pqr[] = {'p', 'q', 'r', '\0'};
+
+TEST(string_size, types)
+{
+  ASSERT_EQ(3u, string_size(abc));
+  ASSERT_EQ(3u, string_size(def));
+  ASSERT_EQ(3u, string_size(ghi));
+  ASSERT_EQ(3u, string_size(jkl));
+  ASSERT_EQ(3u, string_size(mno));
+  ASSERT_EQ(3u, string_size(pqr));
+
+  constexpr auto compile_time_string_view_size = string_size(jkl);
+  ASSERT_EQ(3u, compile_time_string_view_size);
+  constexpr auto compile_time_string_literal_size = string_size(mno);
+  ASSERT_EQ(3u, compile_time_string_literal_size);
+
+  char arr[] = {'a', 'b', 'c'}; // not null-terminated
+  ASSERT_THROW(string_size(arr), std::invalid_argument);
+}
+
+TEST(string_cat_reserve, types)
+{
+  ASSERT_EQ("abcdefghijklmnopqr",
+            string_cat_reserve(abc, def, ghi, jkl, mno, pqr));
+}
+
+TEST(string_cat_reserve, count)
+{
+  ASSERT_EQ("", string_cat_reserve());
+  ASSERT_EQ("abc", string_cat_reserve(abc));
+  ASSERT_EQ("abcdef", string_cat_reserve(abc, def));
+}
+
+TEST(string_join_reserve, types)
+{
+  ASSERT_EQ("abc, def, ghi, jkl, mno, pqr",
+            string_join_reserve(", ", abc, def, ghi, jkl, mno, pqr));
+}
+
+TEST(string_join_reserve, count)
+{
+  ASSERT_EQ("", string_join_reserve(", "));
+  ASSERT_EQ("abc", string_join_reserve(", ", abc));
+  ASSERT_EQ("abc, def", string_join_reserve(", ", abc, def));
+}
+
+TEST(string_join_reserve, delim)
+{
+  ASSERT_EQ("abcdef", string_join_reserve("", abc, def));
+  ASSERT_EQ("abc def", string_join_reserve(' ', abc, def));
+  ASSERT_EQ("abc\ndef", string_join_reserve('\n', abc, def));
+  ASSERT_EQ("abcfoodef", string_join_reserve(std::string{"foo"}, abc, def));
+}