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diff --git a/src/ceph/src/test/rbd_mirror/test_InstanceWatcher.cc b/src/ceph/src/test/rbd_mirror/test_InstanceWatcher.cc
new file mode 100644
index 0000000..1924928
--- /dev/null
+++ b/src/ceph/src/test/rbd_mirror/test_InstanceWatcher.cc
@@ -0,0 +1,131 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "include/rados/librados.hpp"
+#include "include/stringify.h"
+#include "cls/rbd/cls_rbd_types.h"
+#include "cls/rbd/cls_rbd_client.h"
+#include "librbd/Utils.h"
+#include "librbd/internal.h"
+#include "test/rbd_mirror/test_fixture.h"
+#include "tools/rbd_mirror/InstanceWatcher.h"
+#include "tools/rbd_mirror/Threads.h"
+
+#include "test/librados/test.h"
+#include "gtest/gtest.h"
+
+using rbd::mirror::InstanceWatcher;
+
+void register_test_instance_watcher() {
+}
+
+class TestInstanceWatcher : public ::rbd::mirror::TestFixture {
+public:
+  std::string m_instance_id;
+  std::string m_oid;
+
+  void SetUp() override {
+    TestFixture::SetUp();
+    m_local_io_ctx.remove(RBD_MIRROR_LEADER);
+    EXPECT_EQ(0, m_local_io_ctx.create(RBD_MIRROR_LEADER, true));
+
+    m_instance_id = stringify(m_local_io_ctx.get_instance_id());
+    m_oid = RBD_MIRROR_INSTANCE_PREFIX + m_instance_id;
+  }
+
+  void get_instances(std::vector<std::string> *instance_ids) {
+    instance_ids->clear();
+    C_SaferCond on_get;
+    InstanceWatcher<>::get_instances(m_local_io_ctx, instance_ids, &on_get);
+    EXPECT_EQ(0, on_get.wait());
+  }
+};
+
+TEST_F(TestInstanceWatcher, InitShutdown)
+{
+  InstanceWatcher<> instance_watcher(m_local_io_ctx, m_threads->work_queue,
+                                     nullptr, m_instance_id);
+  std::vector<std::string> instance_ids;
+  get_instances(&instance_ids);
+  ASSERT_EQ(0U, instance_ids.size());
+
+  uint64_t size;
+  ASSERT_EQ(-ENOENT, m_local_io_ctx.stat(m_oid, &size, nullptr));
+
+  // Init
+  ASSERT_EQ(0, instance_watcher.init());
+
+  get_instances(&instance_ids);
+  ASSERT_EQ(1U, instance_ids.size());
+  ASSERT_EQ(m_instance_id, instance_ids[0]);
+
+  ASSERT_EQ(0, m_local_io_ctx.stat(m_oid, &size, nullptr));
+  std::list<obj_watch_t> watchers;
+  ASSERT_EQ(0, m_local_io_ctx.list_watchers(m_oid, &watchers));
+  ASSERT_EQ(1U, watchers.size());
+  ASSERT_EQ(m_instance_id, stringify(watchers.begin()->watcher_id));
+
+  get_instances(&instance_ids);
+  ASSERT_EQ(1U, instance_ids.size());
+
+  // Shutdown
+  instance_watcher.shut_down();
+
+  ASSERT_EQ(-ENOENT, m_local_io_ctx.stat(m_oid, &size, nullptr));
+  get_instances(&instance_ids);
+  ASSERT_EQ(0U, instance_ids.size());
+}
+
+TEST_F(TestInstanceWatcher, Remove)
+{
+  std::string instance_id = "instance_id";
+  std::string oid = RBD_MIRROR_INSTANCE_PREFIX + instance_id;
+
+  std::vector<std::string> instance_ids;
+  get_instances(&instance_ids);
+  ASSERT_EQ(0U, instance_ids.size());
+
+  uint64_t size;
+  ASSERT_EQ(-ENOENT, m_local_io_ctx.stat(oid, &size, nullptr));
+
+  librados::Rados cluster;
+  librados::IoCtx io_ctx;
+  ASSERT_EQ("", connect_cluster_pp(cluster));
+  ASSERT_EQ(0, cluster.ioctx_create(_local_pool_name.c_str(), io_ctx));
+  InstanceWatcher<> instance_watcher(m_local_io_ctx, m_threads->work_queue,
+                                     nullptr, "instance_id");
+  // Init
+  ASSERT_EQ(0, instance_watcher.init());
+
+  get_instances(&instance_ids);
+  ASSERT_EQ(1U, instance_ids.size());
+  ASSERT_EQ(instance_id, instance_ids[0]);
+
+  ASSERT_EQ(0, m_local_io_ctx.stat(oid, &size, nullptr));
+  std::list<obj_watch_t> watchers;
+  ASSERT_EQ(0, m_local_io_ctx.list_watchers(oid, &watchers));
+  ASSERT_EQ(1U, watchers.size());
+
+  // Remove
+  C_SaferCond on_remove;
+  InstanceWatcher<>::remove_instance(m_local_io_ctx, m_threads->work_queue,
+                                     "instance_id", &on_remove);
+  ASSERT_EQ(0, on_remove.wait());
+
+  ASSERT_EQ(-ENOENT, m_local_io_ctx.stat(oid, &size, nullptr));
+  get_instances(&instance_ids);
+  ASSERT_EQ(0U, instance_ids.size());
+
+  // Shutdown
+  instance_watcher.shut_down();
+
+  ASSERT_EQ(-ENOENT, m_local_io_ctx.stat(m_oid, &size, nullptr));
+  get_instances(&instance_ids);
+  ASSERT_EQ(0U, instance_ids.size());
+
+  // Remove NOENT
+  C_SaferCond on_remove_noent;
+  InstanceWatcher<>::remove_instance(m_local_io_ctx, m_threads->work_queue,
+                                     instance_id, &on_remove_noent);
+  ASSERT_EQ(0, on_remove_noent.wait());
+}