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diff --git a/src/ceph/src/test/rbd_mirror/test_mock_ImageSyncThrottler.cc b/src/ceph/src/test/rbd_mirror/test_mock_ImageSyncThrottler.cc
new file mode 100644
index 0000000..24815ae
--- /dev/null
+++ b/src/ceph/src/test/rbd_mirror/test_mock_ImageSyncThrottler.cc
@@ -0,0 +1,182 @@
+// -*- 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) 2016 SUSE LINUX GmbH
+ *
+ * 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 "test/rbd_mirror/test_mock_fixture.h"
+#include "test/librbd/mock/MockImageCtx.h"
+
+namespace librbd {
+
+namespace {
+
+struct MockTestImageCtx : public librbd::MockImageCtx {
+  MockTestImageCtx(librbd::ImageCtx &image_ctx)
+    : librbd::MockImageCtx(image_ctx) {
+  }
+};
+
+} // anonymous namespace
+
+} // namespace librbd
+
+// template definitions
+#include "tools/rbd_mirror/ImageSyncThrottler.cc"
+
+namespace rbd {
+namespace mirror {
+
+class TestMockImageSyncThrottler : public TestMockFixture {
+public:
+  typedef ImageSyncThrottler<librbd::MockTestImageCtx> MockImageSyncThrottler;
+
+};
+
+TEST_F(TestMockImageSyncThrottler, Single_Sync) {
+  MockImageSyncThrottler throttler;
+  C_SaferCond on_start;
+  throttler.start_op("id", &on_start);
+  ASSERT_EQ(0, on_start.wait());
+  throttler.finish_op("id");
+}
+
+TEST_F(TestMockImageSyncThrottler, Multiple_Syncs) {
+  MockImageSyncThrottler throttler;
+  throttler.set_max_concurrent_syncs(2);
+
+  C_SaferCond on_start1;
+  throttler.start_op("id1", &on_start1);
+  C_SaferCond on_start2;
+  throttler.start_op("id2", &on_start2);
+  C_SaferCond on_start3;
+  throttler.start_op("id3", &on_start3);
+  C_SaferCond on_start4;
+  throttler.start_op("id4", &on_start4);
+
+  ASSERT_EQ(0, on_start2.wait());
+  throttler.finish_op("id2");
+  ASSERT_EQ(0, on_start3.wait());
+  throttler.finish_op("id3");
+  ASSERT_EQ(0, on_start1.wait());
+  throttler.finish_op("id1");
+  ASSERT_EQ(0, on_start4.wait());
+  throttler.finish_op("id4");
+}
+
+TEST_F(TestMockImageSyncThrottler, Cancel_Running_Sync) {
+  MockImageSyncThrottler throttler;
+  C_SaferCond on_start;
+  throttler.start_op("id", &on_start);
+  ASSERT_EQ(0, on_start.wait());
+  ASSERT_FALSE(throttler.cancel_op("id"));
+  throttler.finish_op("id");
+}
+
+TEST_F(TestMockImageSyncThrottler, Cancel_Waiting_Sync) {
+  MockImageSyncThrottler throttler;
+  throttler.set_max_concurrent_syncs(1);
+
+  C_SaferCond on_start1;
+  throttler.start_op("id1", &on_start1);
+  C_SaferCond on_start2;
+  throttler.start_op("id2", &on_start2);
+
+  ASSERT_EQ(0, on_start1.wait());
+  ASSERT_TRUE(throttler.cancel_op("id2"));
+  ASSERT_EQ(-ECANCELED, on_start2.wait());
+  throttler.finish_op("id1");
+}
+
+
+TEST_F(TestMockImageSyncThrottler, Cancel_Running_Sync_Start_Waiting) {
+  MockImageSyncThrottler throttler;
+  throttler.set_max_concurrent_syncs(1);
+
+  C_SaferCond on_start1;
+  throttler.start_op("id1", &on_start1);
+  C_SaferCond on_start2;
+  throttler.start_op("id2", &on_start2);
+
+  ASSERT_EQ(0, on_start1.wait());
+  ASSERT_FALSE(throttler.cancel_op("id1"));
+  throttler.finish_op("id1");
+  ASSERT_EQ(0, on_start2.wait());
+  throttler.finish_op("id2");
+}
+
+TEST_F(TestMockImageSyncThrottler, Increase_Max_Concurrent_Syncs) {
+  MockImageSyncThrottler throttler;
+  throttler.set_max_concurrent_syncs(2);
+
+  C_SaferCond on_start1;
+  throttler.start_op("id1", &on_start1);
+  C_SaferCond on_start2;
+  throttler.start_op("id2", &on_start2);
+  C_SaferCond on_start3;
+  throttler.start_op("id3", &on_start3);
+  C_SaferCond on_start4;
+  throttler.start_op("id4", &on_start4);
+  C_SaferCond on_start5;
+  throttler.start_op("id5", &on_start5);
+
+  ASSERT_EQ(0, on_start1.wait());
+  ASSERT_EQ(0, on_start2.wait());
+
+  throttler.set_max_concurrent_syncs(4);
+
+  ASSERT_EQ(0, on_start3.wait());
+  ASSERT_EQ(0, on_start4.wait());
+
+  throttler.finish_op("id4");
+  ASSERT_EQ(0, on_start5.wait());
+
+  throttler.finish_op("id1");
+  throttler.finish_op("id2");
+  throttler.finish_op("id3");
+  throttler.finish_op("id5");
+}
+
+TEST_F(TestMockImageSyncThrottler, Decrease_Max_Concurrent_Syncs) {
+  MockImageSyncThrottler throttler;
+  throttler.set_max_concurrent_syncs(4);
+
+  C_SaferCond on_start1;
+  throttler.start_op("id1", &on_start1);
+  C_SaferCond on_start2;
+  throttler.start_op("id2", &on_start2);
+  C_SaferCond on_start3;
+  throttler.start_op("id3", &on_start3);
+  C_SaferCond on_start4;
+  throttler.start_op("id4", &on_start4);
+  C_SaferCond on_start5;
+  throttler.start_op("id5", &on_start5);
+
+  ASSERT_EQ(0, on_start1.wait());
+  ASSERT_EQ(0, on_start2.wait());
+  ASSERT_EQ(0, on_start3.wait());
+  ASSERT_EQ(0, on_start4.wait());
+
+  throttler.set_max_concurrent_syncs(2);
+
+  throttler.finish_op("id1");
+  throttler.finish_op("id2");
+  throttler.finish_op("id3");
+
+  ASSERT_EQ(0, on_start5.wait());
+
+  throttler.finish_op("id4");
+  throttler.finish_op("id5");
+}
+
+} // namespace mirror
+} // namespace rbd
+