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diff --git a/src/ceph/src/test/ceph_compatset.cc b/src/ceph/src/test/ceph_compatset.cc
new file mode 100644
index 0000000..3010b55
--- /dev/null
+++ b/src/ceph/src/test/ceph_compatset.cc
@@ -0,0 +1,168 @@
+// -*- 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) 2011 New Dream Network
+ *
+ * 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 <fstream>
+#include <iostream>
+#include <errno.h>
+#include <sys/stat.h>
+#include <signal.h>
+#include <ctype.h>
+#include <boost/scoped_ptr.hpp>
+#include <string>
+
+#include "include/types.h"
+#include "include/compat.h"
+#include "include/coredumpctl.h"
+
+//#undef assert
+//#define	assert(foo) if (!(foo)) abort();
+
+#include "include/CompatSet.h"
+
+#include "gtest/gtest.h"
+#include <vector>
+
+TEST(CephCompatSet, AllSet) {
+  CompatSet::FeatureSet compat;
+  CompatSet::FeatureSet ro;
+  CompatSet::FeatureSet incompat;
+
+  {
+    PrCtl unset_dumpable;
+    EXPECT_DEATH(compat.insert(CompatSet::Feature(0, "test")), "");
+    EXPECT_DEATH(compat.insert(CompatSet::Feature(64, "test")), "");
+  }
+
+  for (int i = 1; i < 64; i++) {
+    stringstream cname;
+    cname << string("c") << i;
+    compat.insert(CompatSet::Feature(i,cname.str().c_str()));
+    stringstream roname;
+    roname << string("r") << i;
+    ro.insert(CompatSet::Feature(i,roname.str().c_str()));
+    stringstream iname;
+    iname << string("i") << i;
+    incompat.insert(CompatSet::Feature(i,iname.str().c_str()));
+  }
+  CompatSet tcs(compat, ro, incompat);
+
+  //cout << tcs << std::endl;
+
+  //Due to a workaround for a bug bit 0 is always set even though it is
+  //not a legal feature.
+  EXPECT_EQ(tcs.compat.mask, (uint64_t)0xffffffffffffffff);
+  EXPECT_EQ(tcs.ro_compat.mask, (uint64_t)0xffffffffffffffff);
+  EXPECT_EQ(tcs.incompat.mask, (uint64_t)0xffffffffffffffff);
+
+  for (int i = 1; i < 64; i++) {
+    EXPECT_TRUE(tcs.compat.contains(i));
+    stringstream cname;
+    cname << string("c") << i;
+    EXPECT_TRUE(tcs.compat.contains(CompatSet::Feature(i,cname.str().c_str())));
+    tcs.compat.remove(i);
+
+    EXPECT_TRUE(tcs.ro_compat.contains(i));
+    stringstream roname;
+    roname << string("r") << i;
+    EXPECT_TRUE(tcs.ro_compat.contains(CompatSet::Feature(i,roname.str().c_str())));
+    tcs.ro_compat.remove(i);
+
+    EXPECT_TRUE(tcs.incompat.contains(i));
+    stringstream iname;
+    iname << string("i") << i;
+    EXPECT_TRUE(tcs.incompat.contains(CompatSet::Feature(i,iname.str().c_str())));
+    tcs.incompat.remove(i);
+  }
+  //Due to a workaround for a bug bit 0 is always set even though it is
+  //not a legal feature.
+  EXPECT_EQ(tcs.compat.mask, (uint64_t)1);
+  EXPECT_TRUE(tcs.compat.names.empty());
+  EXPECT_EQ(tcs.ro_compat.mask, (uint64_t)1);
+  EXPECT_TRUE(tcs.ro_compat.names.empty());
+  EXPECT_EQ(tcs.incompat.mask, (uint64_t)1);
+  EXPECT_TRUE(tcs.incompat.names.empty());
+}
+
+TEST(CephCompatSet, other) {
+  CompatSet s1, s2, s1dup;
+
+  s1.compat.insert(CompatSet::Feature(1, "c1"));
+  s1.compat.insert(CompatSet::Feature(2, "c2"));
+  s1.compat.insert(CompatSet::Feature(32, "c32"));
+  s1.ro_compat.insert(CompatSet::Feature(63, "r63"));
+  s1.incompat.insert(CompatSet::Feature(1, "i1"));
+
+  s2.compat.insert(CompatSet::Feature(1, "c1"));
+  s2.compat.insert(CompatSet::Feature(32, "c32"));
+  s2.ro_compat.insert(CompatSet::Feature(63, "r63"));
+  s2.incompat.insert(CompatSet::Feature(1, "i1"));
+
+  s1dup = s1;
+
+  //Check exact match
+  EXPECT_EQ(s1.compare(s1dup), 0);
+
+  //Check superset
+  EXPECT_EQ(s1.compare(s2), 1);
+
+  //Check missing features
+  EXPECT_EQ(s2.compare(s1), -1);
+
+  CompatSet diff = s2.unsupported(s1);
+  EXPECT_EQ(diff.compat.mask, (uint64_t)1<<2 | 1);
+  EXPECT_EQ(diff.ro_compat.mask, (uint64_t)1);
+  EXPECT_EQ(diff.incompat.mask, (uint64_t)1);
+
+  CompatSet s3 = s1;
+  s3.incompat.insert(CompatSet::Feature(4, "i4"));
+
+  diff = s1.unsupported(s3);
+  EXPECT_EQ(diff.compat.mask, (uint64_t)1);
+  EXPECT_EQ(diff.ro_compat.mask, (uint64_t)1);
+  EXPECT_EQ(diff.incompat.mask, (uint64_t)1<<4 | 1);
+}
+
+TEST(CephCompatSet, merge) {
+  CompatSet s1, s2, s1dup, s2dup;
+
+  s1.compat.insert(CompatSet::Feature(1, "c1"));
+  s1.compat.insert(CompatSet::Feature(2, "c2"));
+  s1.compat.insert(CompatSet::Feature(32, "c32"));
+  s1.ro_compat.insert(CompatSet::Feature(63, "r63"));
+  s1.incompat.insert(CompatSet::Feature(1, "i1"));
+
+  s1dup = s1;
+
+  s2.compat.insert(CompatSet::Feature(1, "c1"));
+  s2.compat.insert(CompatSet::Feature(32, "c32"));
+  s2.ro_compat.insert(CompatSet::Feature(1, "r1"));
+  s2.ro_compat.insert(CompatSet::Feature(63, "r63"));
+  s2.incompat.insert(CompatSet::Feature(1, "i1"));
+
+  s2dup = s2;
+
+  //Nothing to merge if they are the same
+  EXPECT_FALSE(s1.merge(s1dup));
+  EXPECT_FALSE(s2.merge(s2dup));
+
+  EXPECT_TRUE(s1.merge(s2));
+  EXPECT_EQ(s1.compat.mask, (uint64_t)1<<1 | (uint64_t)1<<2 | (uint64_t)1<<32 | 1);
+  EXPECT_EQ(s1.ro_compat.mask, (uint64_t)1<<1 | (uint64_t)1<<63 | 1);
+  EXPECT_EQ(s1.incompat.mask, (uint64_t)1<<1 | 1);
+
+  EXPECT_TRUE(s2.merge(s1dup));
+  EXPECT_EQ(s2.compat.mask, (uint64_t)1<<1 | (uint64_t)1<<2 | (uint64_t)1<<32 | 1);
+  EXPECT_EQ(s2.ro_compat.mask, (uint64_t)1<<1 | (uint64_t)1<<63 | 1);
+  EXPECT_EQ(s2.incompat.mask, (uint64_t)1<<1 | 1);
+}