diff --git a/tests/unittests/BUILD.gn b/tests/unittests/BUILD.gn
index 686cdadaff6a1dac8962e0153a277cd59eb871ab..082474e55bc725f78829874c614c76ffa9f5435c 100644
--- a/tests/unittests/BUILD.gn
+++ b/tests/unittests/BUILD.gn
@@ -19,6 +19,7 @@ group("unittests") {
 
   deps = [
     "backup_api:backup_api_test",
+    "backup_ext:backup_ext_test",
     "backup_sa:backup_sa_test",
     "backup_tools:backup_test",
     "backup_utils:backup_test",
diff --git a/tests/unittests/backup_ext/BUILD.gn b/tests/unittests/backup_ext/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..ae09f651f4363c574b4fe12d82c4ff65dd7b22b5
--- /dev/null
+++ b/tests/unittests/backup_ext/BUILD.gn
@@ -0,0 +1,144 @@
+# Copyright (c) 2022-2023 Huawei Device Co., Ltd.
+# 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.
+
+import("//build/test.gni")
+import("//foundation/filemanagement/app_file_service/backup.gni")
+
+ohos_unittest("tar_file_test") {
+  module_out_path = path_module_out_tests
+
+  sources = [
+    "${path_backup}/frameworks/native/backup_ext/src/ext_backup.cpp",
+    "${path_backup}/frameworks/native/backup_ext/src/ext_backup_js.cpp",
+    "${path_backup}/frameworks/native/backup_ext/src/ext_backup_loader.cpp",
+    "${path_backup}/frameworks/native/backup_ext/src/ext_extension.cpp",
+    "${path_backup}/frameworks/native/backup_ext/src/ext_extension_stub.cpp",
+    "${path_backup}/frameworks/native/backup_ext/src/tar_file.cpp",
+    "${path_backup}/frameworks/native/backup_ext/src/untar_file.cpp",
+    "tar_file_test.cpp",
+  ]
+  sources += backup_mock_proxy_src
+
+  include_dirs = [
+    "${path_ability_runtime}/services/common/include",
+    "${path_ability_runtime}/interfaces/kits/napi/aafwk/inner/napi_common",
+    "${path_ability_runtime}/interfaces/kits/native/appkit/ability_runtime",
+    "${path_backup}/frameworks/native/backup_ext/include",
+    "${path_backup}/interfaces/inner_api/native/backup_kit_inner/",
+    "${path_backup}/interfaces/inner_api/native/backup_kit_inner/impl",
+    "${path_backup}/frameworks/native/backup_kit_inner/include",
+    "${path_backup}/utils/include",
+    "${path_napi}/native_engine",
+  ]
+  include_dirs += backup_mock_utils_include
+
+  deps = [
+    "${path_backup}/interfaces/inner_api/native/backup_kit_inner:backup_kit_inner",
+    "${path_backup}/tests/utils:backup_test_utils",
+    "${path_backup}/utils:backup_utils",
+    "${path_googletest}:gmock_main",
+    "${path_jsoncpp}:jsoncpp",
+  ]
+
+  external_deps = [
+    "ability_base:want",
+    "ability_runtime:ability_context_native",
+    "ability_runtime:abilitykit_native",
+    "ability_runtime:app_context",
+    "ability_runtime:appkit_native",
+    "ability_runtime:runtime",
+    "access_token:libaccesstoken_sdk",
+    "bundle_framework:appexecfwk_core",
+    "c_utils:utils",
+    "ipc:ipc_core",
+    "napi:ace_napi",
+    "samgr:samgr_proxy",
+  ]
+
+  sanitize = {
+    cfi = true
+    cfi_cross_dso = true
+    debug = false
+  }
+
+  use_exceptions = true
+}
+
+ohos_unittest("untar_file_test") {
+  module_out_path = path_module_out_tests
+
+  sources = [
+    "${path_backup}/frameworks/native/backup_ext/src/ext_backup.cpp",
+    "${path_backup}/frameworks/native/backup_ext/src/ext_backup_js.cpp",
+    "${path_backup}/frameworks/native/backup_ext/src/ext_backup_loader.cpp",
+    "${path_backup}/frameworks/native/backup_ext/src/ext_extension.cpp",
+    "${path_backup}/frameworks/native/backup_ext/src/ext_extension_stub.cpp",
+    "${path_backup}/frameworks/native/backup_ext/src/tar_file.cpp",
+    "${path_backup}/frameworks/native/backup_ext/src/untar_file.cpp",
+    "untar_file_test.cpp",
+  ]
+  sources += backup_mock_proxy_src
+
+  include_dirs = [
+    "${path_ability_runtime}/services/common/include",
+    "${path_ability_runtime}/interfaces/kits/napi/aafwk/inner/napi_common",
+    "${path_ability_runtime}/interfaces/kits/native/appkit/ability_runtime",
+    "${path_backup}/frameworks/native/backup_ext/include",
+    "${path_backup}/interfaces/inner_api/native/backup_kit_inner/",
+    "${path_backup}/interfaces/inner_api/native/backup_kit_inner/impl",
+    "${path_backup}/frameworks/native/backup_kit_inner/include",
+    "${path_backup}/utils/include",
+    "${path_napi}/native_engine",
+  ]
+  include_dirs += backup_mock_utils_include
+
+  deps = [
+    "${path_backup}/interfaces/inner_api/native/backup_kit_inner:backup_kit_inner",
+    "${path_backup}/tests/utils:backup_test_utils",
+    "${path_backup}/utils:backup_utils",
+    "${path_googletest}:gmock_main",
+    "${path_jsoncpp}:jsoncpp",
+  ]
+
+  external_deps = [
+    "ability_base:want",
+    "ability_runtime:ability_context_native",
+    "ability_runtime:abilitykit_native",
+    "ability_runtime:app_context",
+    "ability_runtime:appkit_native",
+    "ability_runtime:runtime",
+    "access_token:libaccesstoken_sdk",
+    "bundle_framework:appexecfwk_core",
+    "c_utils:utils",
+    "ipc:ipc_core",
+    "napi:ace_napi",
+    "samgr:samgr_proxy",
+  ]
+
+  sanitize = {
+    cfi = true
+    cfi_cross_dso = true
+    debug = false
+  }
+
+  use_exceptions = true
+}
+
+group("backup_ext_test") {
+  testonly = true
+
+  deps = [
+    ":tar_file_test",
+    ":untar_file_test",
+  ]
+}