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diff --git a/src/ceph/src/test/test_prebufferedstreambuf.cc b/src/ceph/src/test/test_prebufferedstreambuf.cc
new file mode 100644
index 0000000..489a985
--- /dev/null
+++ b/src/ceph/src/test/test_prebufferedstreambuf.cc
@@ -0,0 +1,95 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "common/PrebufferedStreambuf.h"
+#include "gtest/gtest.h"
+
+TEST(PrebufferedStreambuf, Empty)
+{
+  char buf[10];
+  PrebufferedStreambuf sb(buf, sizeof(buf));
+
+  std::istream is(&sb);
+  std::string out;
+  getline(is, out);
+  ASSERT_EQ("", out);
+}
+
+TEST(PrebufferedStreambuf, Simple)
+{
+  char buf[10];
+  PrebufferedStreambuf sb(buf, sizeof(buf));
+
+  std::ostream os(&sb);
+  os << "test";
+
+  std::istream is(&sb);
+  std::string out;
+  getline(is, out);
+  ASSERT_EQ("test", out);
+}
+
+TEST(PrebufferedStreambuf, Multiline)
+{
+  char buf[10];
+  PrebufferedStreambuf sb(buf, sizeof(buf));
+
+  std::ostream os(&sb);
+  const char *s = "this is a line\nanother line\nand a third\nwhee!\n";
+  os << s;
+
+  std::istream is(&sb);
+  std::string out;
+  getline(is, out, is.widen(0));
+  ASSERT_EQ(s, out);
+}
+
+TEST(PrebufferedStreambuf, Withnull)
+{
+  char buf[10];
+  PrebufferedStreambuf sb(buf, sizeof(buf));
+
+  std::ostream os(&sb);
+  std::string s("null \0 and more", 15);
+  os << s;
+
+  std::istream is(&sb);
+  std::string out;
+  getline(is, out);
+  ASSERT_EQ(s, out);
+}
+
+TEST(PrebufferedStreambuf, SimpleOverflow)
+{
+  char buf[10];
+  PrebufferedStreambuf sb(buf, sizeof(buf));
+
+  std::ostream os(&sb);
+  const char *s = "hello, this is longer than buf[10]";
+  os << s;
+
+  ASSERT_EQ(s, sb.get_str());
+
+  std::istream is(&sb);
+  std::string out;
+  getline(is, out);
+  ASSERT_EQ(s, out);
+}
+
+TEST(PrebufferedStreambuf, ManyOverflow)
+{
+  char buf[10];
+  PrebufferedStreambuf sb(buf, sizeof(buf));
+
+  std::ostream os(&sb);
+  const char *s = "hello, this way way way way way way way way way way way way way way way way way way way way way way way way way _way_ longer than buf[10]";
+  os << s;
+
+  ASSERT_EQ(s, sb.get_str());
+
+  std::istream is(&sb);
+  std::string out;
+  getline(is, out);
+  ASSERT_EQ(s, out);
+}
+