Add a path parsing policy handler for the RoamingProfileLocation policy.

chrome/browser/policy/local_sync_policy_handler_unittest.cc

+// 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.
+
+#include <string>
+
+#include "base/memory/ptr_util.h"
+#include "base/values.h"
+#include "chrome/browser/policy/local_sync_policy_handler.h"
+#include "components/policy/core/common/policy_map.h"
+#include "components/policy/core/common/policy_types.h"
+#include "components/policy/policy_constants.h"
+#include "components/prefs/pref_value_map.h"
+#include "components/sync/base/pref_names.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace policy {
+
+class LocalSyncPolicyTest : public testing::Test {
+ protected:
+  PolicyMap policy_;
+  LocalSyncPolicyHandler handler_;
+  PrefValueMap prefs_;
+};
+
+TEST_F(LocalSyncPolicyTest, Default) {
+  handler_.ApplyPolicySettings(policy_, &prefs_);
+  EXPECT_FALSE(prefs_.GetValue(syncer::prefs::kLocalSyncBackendDir, nullptr));
+}
+
+// RoamingProfileLocation policy expects a string; give it a boolean.
+TEST_F(LocalSyncPolicyTest, SetPolicyInvalid) {
+  policy_.Set(key::kRoamingProfileLocation, POLICY_LEVEL_MANDATORY,
+              POLICY_SCOPE_USER, POLICY_SOURCE_CLOUD,
+              base::MakeUnique<base::Value>(false), nullptr);
+  handler_.ApplyPolicySettings(policy_, &prefs_);
+  EXPECT_FALSE(prefs_.GetValue(syncer::prefs::kLocalSyncBackendDir, nullptr));
+}
+
+// Use a variable in the value. It should be expanded by the handler.
+TEST_F(LocalSyncPolicyTest, SetPolicyValid) {
+  const std::string in = "${user_name}/foo";
+  policy_.Set(key::kRoamingProfileLocation, POLICY_LEVEL_MANDATORY,
+              POLICY_SCOPE_USER, POLICY_SOURCE_CLOUD,
+              base::MakeUnique<base::Value>(in), nullptr);
+  handler_.ApplyPolicySettings(policy_, &prefs_);
+
+  const base::Value* value;
+  ASSERT_TRUE(prefs_.GetValue(syncer::prefs::kLocalSyncBackendDir, &value));
+  std::string out;
+  ASSERT_TRUE(value->GetAsString(&out));
+  EXPECT_NE(std::string::npos, out.find("foo"));
+  EXPECT_EQ(std::string::npos, out.find("${user_name}"));
+}
+
+}  // namespace policy