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diff --git a/src/ceph/src/test/librbd/object_map/test_mock_ResizeRequest.cc b/src/ceph/src/test/librbd/object_map/test_mock_ResizeRequest.cc
new file mode 100644
index 0000000..de5aa8a
--- /dev/null
+++ b/src/ceph/src/test/librbd/object_map/test_mock_ResizeRequest.cc
@@ -0,0 +1,145 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "test/librbd/test_mock_fixture.h"
+#include "test/librbd/test_support.h"
+#include "test/librados_test_stub/MockTestMemIoCtxImpl.h"
+#include "common/bit_vector.hpp"
+#include "librbd/internal.h"
+#include "librbd/ObjectMap.h"
+#include "librbd/object_map/ResizeRequest.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+namespace librbd {
+namespace object_map {
+
+using ::testing::_;
+using ::testing::DoDefault;
+using ::testing::Return;
+using ::testing::StrEq;
+
+class TestMockObjectMapResizeRequest : public TestMockFixture {
+public:
+  void expect_resize(librbd::ImageCtx *ictx, uint64_t snap_id, int r) {
+    std::string oid(ObjectMap<>::object_map_name(ictx->id, snap_id));
+    if (snap_id == CEPH_NOSNAP) {
+      EXPECT_CALL(get_mock_io_ctx(ictx->md_ctx),
+                  exec(oid, _, StrEq("lock"), StrEq("assert_locked"), _, _, _))
+                    .WillOnce(DoDefault());
+    }
+
+    if (r < 0) {
+      EXPECT_CALL(get_mock_io_ctx(ictx->md_ctx),
+                  exec(oid, _, StrEq("rbd"), StrEq("object_map_resize"), _, _, _))
+                    .WillOnce(Return(r));
+    } else {
+      EXPECT_CALL(get_mock_io_ctx(ictx->md_ctx),
+                  exec(oid, _, StrEq("rbd"), StrEq("object_map_resize"), _, _, _))
+                    .WillOnce(DoDefault());
+    }
+  }
+
+  void expect_invalidate(librbd::ImageCtx *ictx) {
+    EXPECT_CALL(get_mock_io_ctx(ictx->md_ctx),
+                exec(ictx->header_oid, _, StrEq("rbd"), StrEq("set_flags"), _, _, _))
+                  .WillOnce(DoDefault());
+  }
+};
+
+TEST_F(TestMockObjectMapResizeRequest, UpdateInMemory) {
+  REQUIRE_FEATURE(RBD_FEATURE_OBJECT_MAP);
+
+  librbd::ImageCtx *ictx;
+  ASSERT_EQ(0, open_image(m_image_name, &ictx));
+  ASSERT_EQ(0, acquire_exclusive_lock(*ictx));
+
+  ceph::BitVector<2> object_map;
+  object_map.resize(1);
+
+  C_SaferCond cond_ctx;
+  AsyncRequest<> *req = new ResizeRequest(
+    *ictx, &object_map, CEPH_NOSNAP, object_map.size(), OBJECT_EXISTS,
+    &cond_ctx);
+  req->send();
+  ASSERT_EQ(0, cond_ctx.wait());
+
+  for (uint64_t i = 0; i < object_map.size(); ++i) {
+    ASSERT_EQ(i == 0 ? OBJECT_NONEXISTENT : OBJECT_EXISTS,
+              object_map[i]);
+  }
+}
+
+TEST_F(TestMockObjectMapResizeRequest, UpdateHeadOnDisk) {
+  REQUIRE_FEATURE(RBD_FEATURE_OBJECT_MAP);
+
+  librbd::ImageCtx *ictx;
+  ASSERT_EQ(0, open_image(m_image_name, &ictx));
+  ASSERT_EQ(0, acquire_exclusive_lock(*ictx));
+
+  expect_resize(ictx, CEPH_NOSNAP, 0);
+
+  ceph::BitVector<2> object_map;
+  object_map.resize(1);
+
+  C_SaferCond cond_ctx;
+  AsyncRequest<> *req = new ResizeRequest(
+    *ictx, &object_map, CEPH_NOSNAP, object_map.size(), OBJECT_EXISTS,
+    &cond_ctx);
+  req->send();
+  ASSERT_EQ(0, cond_ctx.wait());
+
+  expect_unlock_exclusive_lock(*ictx);
+}
+
+TEST_F(TestMockObjectMapResizeRequest, UpdateSnapOnDisk) {
+  REQUIRE_FEATURE(RBD_FEATURE_OBJECT_MAP);
+
+  librbd::ImageCtx *ictx;
+  ASSERT_EQ(0, open_image(m_image_name, &ictx));
+  ASSERT_EQ(0, snap_create(*ictx, "snap1"));
+  ASSERT_EQ(0, librbd::snap_set(ictx,
+				cls::rbd::UserSnapshotNamespace(),
+				"snap1"));
+
+  uint64_t snap_id = ictx->snap_id;
+  expect_resize(ictx, snap_id, 0);
+
+  ceph::BitVector<2> object_map;
+  object_map.resize(1);
+
+  C_SaferCond cond_ctx;
+  AsyncRequest<> *req = new ResizeRequest(
+    *ictx, &object_map, snap_id, object_map.size(), OBJECT_EXISTS,
+    &cond_ctx);
+  req->send();
+  ASSERT_EQ(0, cond_ctx.wait());
+
+  expect_unlock_exclusive_lock(*ictx);
+}
+
+TEST_F(TestMockObjectMapResizeRequest, UpdateOnDiskError) {
+  REQUIRE_FEATURE(RBD_FEATURE_OBJECT_MAP);
+
+  librbd::ImageCtx *ictx;
+  ASSERT_EQ(0, open_image(m_image_name, &ictx));
+  ASSERT_EQ(0, acquire_exclusive_lock(*ictx));
+
+  expect_resize(ictx, CEPH_NOSNAP, -EINVAL);
+  expect_invalidate(ictx);
+
+  ceph::BitVector<2> object_map;
+  object_map.resize(1);
+
+  C_SaferCond cond_ctx;
+  AsyncRequest<> *req = new ResizeRequest(
+    *ictx, &object_map, CEPH_NOSNAP, object_map.size(), OBJECT_EXISTS,
+    &cond_ctx);
+  req->send();
+  ASSERT_EQ(0, cond_ctx.wait());
+
+  expect_unlock_exclusive_lock(*ictx);
+}
+
+} // namespace object_map
+} // namespace librbd