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diff --git a/src/ceph/src/test/librbd/test_MirroringWatcher.cc b/src/ceph/src/test/librbd/test_MirroringWatcher.cc
new file mode 100644
index 0000000..7b49b71
--- /dev/null
+++ b/src/ceph/src/test/librbd/test_MirroringWatcher.cc
@@ -0,0 +1,100 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "test/librbd/test_fixture.h"
+#include "test/librbd/test_support.h"
+#include "include/rbd_types.h"
+#include "librbd/MirroringWatcher.h"
+#include "gtest/gtest.h"
+#include "gmock/gmock.h"
+#include <list>
+
+void register_test_mirroring_watcher() {
+}
+
+namespace librbd {
+
+namespace {
+
+struct MockMirroringWatcher : public MirroringWatcher<> {
+  std::string oid;
+
+  MockMirroringWatcher(ImageCtx &image_ctx)
+    : MirroringWatcher<>(image_ctx.md_ctx, image_ctx.op_work_queue) {
+  }
+
+  MOCK_METHOD1(handle_mode_updated, void(cls::rbd::MirrorMode));
+  MOCK_METHOD3(handle_image_updated, void(cls::rbd::MirrorImageState,
+                                          const std::string &,
+                                          const std::string &));
+};
+
+} // anonymous namespace
+
+using ::testing::_;
+using ::testing::AtLeast;
+using ::testing::Invoke;
+using ::testing::StrEq;
+using ::testing::WithArg;
+
+class TestMirroringWatcher : public TestFixture {
+public:
+  void SetUp() override {
+    TestFixture::SetUp();
+
+    bufferlist bl;
+    ASSERT_EQ(0, m_ioctx.write_full(RBD_MIRRORING, bl));
+
+    librbd::ImageCtx *ictx;
+    ASSERT_EQ(0, open_image(m_image_name, &ictx));
+
+    m_image_watcher = new MockMirroringWatcher(*ictx);
+    C_SaferCond ctx;
+    m_image_watcher->register_watch(&ctx);
+    if (ctx.wait() != 0) {
+      delete m_image_watcher;
+      m_image_watcher = nullptr;
+      FAIL();
+    }
+  }
+
+  void TearDown() override {
+    if (m_image_watcher != nullptr) {
+      C_SaferCond ctx;
+      m_image_watcher->unregister_watch(&ctx);
+      ASSERT_EQ(0, ctx.wait());
+      delete m_image_watcher;
+    }
+
+    TestFixture::TearDown();
+  }
+
+  MockMirroringWatcher *m_image_watcher = nullptr;
+};
+
+TEST_F(TestMirroringWatcher, ModeUpdated) {
+  EXPECT_CALL(*m_image_watcher,
+              handle_mode_updated(cls::rbd::MIRROR_MODE_DISABLED))
+    .Times(AtLeast(1));
+
+  C_SaferCond ctx;
+  MockMirroringWatcher::notify_mode_updated(
+    m_ioctx, cls::rbd::MIRROR_MODE_DISABLED, &ctx);
+  ASSERT_EQ(0, ctx.wait());
+}
+
+TEST_F(TestMirroringWatcher, ImageStatusUpdated) {
+  EXPECT_CALL(*m_image_watcher,
+              handle_image_updated(cls::rbd::MIRROR_IMAGE_STATE_ENABLED,
+                                   StrEq("image id"),
+                                   StrEq("global image id")))
+    .Times(AtLeast(1));
+
+  C_SaferCond ctx;
+  MockMirroringWatcher::notify_image_updated(
+    m_ioctx, cls::rbd::MIRROR_IMAGE_STATE_ENABLED, "image id",
+    "global image id", &ctx);
+  ASSERT_EQ(0, ctx.wait());
+}
+
+} // namespace librbd