[Identity Service] Add service tests of IdentityManager

services/identity/BUILD.gn

 # Copyright 2017 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//services/catalog/public/tools/catalog.gni")
 import("//services/service_manager/public/cpp/service.gni")
 import("//services/service_manager/public/service_manifest.gni")
 
 source_set("lib") {
   sources = [
     "identity_manager.cc",
     "identity_manager.h",
     "identity_service.cc",
     "identity_service.h",
   ]
 
   deps = [
     "//base",
     "//components/signin/core/account_id",
     "//components/signin/core/browser",
     "//services/identity/public/interfaces",
     "//services/service_manager/public/cpp",
     "//services/service_manager/public/interfaces",
   ]
 }
 
 service_manifest("manifest") {
   name = "identity"
   source = "manifest.json"
 }
+
+source_set("tests") {
+  testonly = true
+  deps = [
+    ":lib",
+    "//base",
+    "//base/test:test_support",
+    "//components/signin/core/account_id",
+    "//components/signin/core/browser",
+    "//components/signin/core/browser:test_support",
+    "//components/sync_preferences:test_support",
+    "//mojo/public/cpp/bindings:bindings",
+    "//services/identity/public/interfaces",
+    "//services/service_manager/public/cpp",
+    "//services/service_manager/public/cpp:service_test_support",
+    "//testing/gmock",
+    "//testing/gtest",
+  ]
+  sources = [
+    "identity_manager_unittest.cc",
+  ]
+}
+
+service_manifest("unittest_manifest") {
+  name = "identity_unittests"
+  source = "unittest_manifest.json"
+  packaged_services = [ ":manifest" ]
+}
+
+catalog("tests_catalog") {
+  testonly = true
+  embedded_services = [ ":unittest_manifest" ]
+}