diff --git a/fs_mgr/libsnapshot/include/libsnapshot/mock_device_info.h b/fs_mgr/libsnapshot/include/libsnapshot/mock_device_info.h
new file mode 100644
index 0000000..ef9d648
--- /dev/null
+++ b/fs_mgr/libsnapshot/include/libsnapshot/mock_device_info.h
@@ -0,0 +1,37 @@
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include <libsnapshot/snapshot.h>
+
+#include <gmock/gmock.h>
+
+namespace android::snapshot {
+
+class MockDeviceInfo : public SnapshotManager::IDeviceInfo {
+  public:
+    MOCK_METHOD(std::string, GetGsidDir, (), (const, override));
+    MOCK_METHOD(std::string, GetMetadataDir, (), (const, override));
+    MOCK_METHOD(std::string, GetSlotSuffix, (), (const, override));
+    MOCK_METHOD(std::string, GetOtherSlotSuffix, (), (const, override));
+    MOCK_METHOD(std::string, GetSuperDevice, (uint32_t slot), (const, override));
+    MOCK_METHOD(const android::fs_mgr::IPartitionOpener&, GetPartitionOpener, (), (const));
+    MOCK_METHOD(bool, IsOverlayfsSetup, (), (const, override));
+    MOCK_METHOD(bool, SetBootControlMergeStatus, (MergeStatus status), (override));
+    MOCK_METHOD(bool, SetSlotAsUnbootable, (unsigned int slot), (override));
+    MOCK_METHOD(bool, IsRecovery, (), (const, override));
+};
+
+}  // namespace android::snapshot
diff --git a/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot.h b/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot.h
new file mode 100644
index 0000000..758d66c
--- /dev/null
+++ b/fs_mgr/libsnapshot/include/libsnapshot/mock_snapshot.h
@@ -0,0 +1,54 @@
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include <libsnapshot/snapshot.h>
+
+#include <gmock/gmock.h>
+
+namespace android::snapshot {
+
+class MockSnapshotManager : public ISnapshotManager {
+  public:
+    MOCK_METHOD(bool, BeginUpdate, (), (override));
+    MOCK_METHOD(bool, CancelUpdate, (), (override));
+    MOCK_METHOD(bool, FinishedSnapshotWrites, (bool wipe), (override));
+    MOCK_METHOD(bool, InitiateMerge, (), (override));
+
+    MOCK_METHOD(UpdateState, ProcessUpdateState,
+                (const std::function<bool()>& callback, const std::function<bool()>& before_cancel),
+                (override));
+    MOCK_METHOD(UpdateState, GetUpdateState, (double* progress), (override));
+    MOCK_METHOD(Return, CreateUpdateSnapshots,
+                (const chromeos_update_engine::DeltaArchiveManifest& manifest), (override));
+    MOCK_METHOD(bool, MapUpdateSnapshot,
+                (const android::fs_mgr::CreateLogicalPartitionParams& params,
+                 std::string* snapshot_path),
+                (override));
+    MOCK_METHOD(bool, UnmapUpdateSnapshot, (const std::string& target_partition_name), (override));
+    MOCK_METHOD(bool, NeedSnapshotsInFirstStageMount, (), (override));
+    MOCK_METHOD(bool, CreateLogicalAndSnapshotPartitions,
+                (const std::string& super_device, const std::chrono::milliseconds& timeout_ms),
+                (override));
+    MOCK_METHOD(bool, HandleImminentDataWipe, (const std::function<void()>& callback), (override));
+    MOCK_METHOD(CreateResult, RecoveryCreateSnapshotDevices, (), (override));
+    MOCK_METHOD(CreateResult, RecoveryCreateSnapshotDevices,
+                (const std::unique_ptr<AutoDevice>& metadata_device), (override));
+    MOCK_METHOD(bool, Dump, (std::ostream & os), (override));
+    MOCK_METHOD(std::unique_ptr<AutoDevice>, EnsureMetadataMounted, (), (override));
+    MOCK_METHOD(ISnapshotMergeStats*, GetSnapshotMergeStatsInstance, (), (override));
+};
+
+}  // namespace android::snapshot
diff --git a/fs_mgr/libsnapshot/snapshot_test.cpp b/fs_mgr/libsnapshot/snapshot_test.cpp
index c662838..53a37be 100644
--- a/fs_mgr/libsnapshot/snapshot_test.cpp
+++ b/fs_mgr/libsnapshot/snapshot_test.cpp
@@ -41,6 +41,11 @@
 #include <libsnapshot/test_helpers.h>
 #include "utility.h"
 
+// Mock classes are not used. Header included to ensure mocked class definition aligns with the
+// class itself.
+#include <libsnapshot/mock_device_info.h>
+#include <libsnapshot/mock_snapshot.h>
+
 namespace android {
 namespace snapshot {