New policy protobuf protocol.

chrome/browser/policy/cloud_policy_cache_unittest.cc

Index: chrome/browser/policy/cloud_policy_cache_unittest.cc
diff --git a/chrome/browser/policy/cloud_policy_cache_unittest.cc b/chrome/browser/policy/cloud_policy_cache_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..554ff48d9e504b0b09724551173207271a40cb99
--- /dev/null
+++ b/chrome/browser/policy/cloud_policy_cache_unittest.cc
@@ -0,0 +1,660 @@
+// Copyright (c) 2011 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 "chrome/browser/policy/cloud_policy_cache.h"
+
+#include <limits>
+#include <string>
+
+#include "base/file_util.h"
+#include "base/message_loop.h"
+#include "base/scoped_temp_dir.h"
+#include "base/values.h"
+#include "chrome/browser/browser_thread.h"
+#include "chrome/browser/policy/proto/cloud_policy.pb.h"
+#include "chrome/browser/policy/proto/device_management_backend.pb.h"
+// TODO(jkummerow): remove this import when removing old DMPC test cases.
+#include "chrome/browser/policy/proto/device_management_constants.h"
+#include "chrome/browser/policy/proto/device_management_local.pb.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace policy {
+
+// Decodes a CloudPolicySettings object into two maps with mandatory and
+// recommended settings, respectively. The implementation is generated code
+// in policy/cloud_policy_generated.cc.
+void DecodePolicy(const em::CloudPolicySettings& policy,
+                  ConfigurationPolicyProvider::PolicyMapType* mandatory,
+                  ConfigurationPolicyProvider::PolicyMapType* recommended);
+
+// The implementations of these methods are in cloud_policy_generated.cc.
+Value* DecodeIntegerValue(google::protobuf::int64 value);
+ListValue* DecodeStringList(const em::StringList& string_list);
+
+// Tests the device management policy cache.
+class CloudPolicyCacheTest : public testing::Test {
+ protected:
+  typedef ConfigurationPolicyProvider::PolicyMapType PolicyMapType;
+
+  CloudPolicyCacheTest()
+      : loop_(MessageLoop::TYPE_UI),
+        ui_thread_(BrowserThread::UI, &loop_),
+        file_thread_(BrowserThread::FILE, &loop_) {}
+
+  void SetUp() {
+    ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
+  }
+
+  void TearDown() {
+    loop_.RunAllPending();
+  }
+
+  // Creates a (signed) CloudPolicyResponse setting the given |homepage| and
+  // featuring the given |timestamp| (as issued by the server).
+  // Mildly hacky special feature: pass an empty string as |homepage| to get
+  // a completely empty policy.
+  em::CloudPolicyResponse* CreateHomepagePolicy(
+      const std::string& homepage,
+      const base::Time& timestamp,
+      const em::PolicyOptions::PolicyMode policy_mode) {
+    em::SignedCloudPolicyResponse signed_response;
+    if (homepage != "") {
+      em::CloudPolicySettings* settings = signed_response.mutable_settings();
+      em::HomepageLocationProto* homepagelocation_proto =
+          settings->mutable_homepagelocation();
+      homepagelocation_proto->set_homepagelocation(homepage);
+      homepagelocation_proto->mutable_policy_options()->set_mode(policy_mode);
+    }
+    signed_response.set_timestamp(timestamp.ToTimeT());
+    std::string serialized_signed_response;
+    EXPECT_TRUE(signed_response.SerializeToString(&serialized_signed_response));
+
+    em::CloudPolicyResponse* response = new em::CloudPolicyResponse;
+    response->set_signed_response(serialized_signed_response);
+    // TODO(jkummerow): Set proper certificate_chain and signature (when
+    // implementing support for signature verification).
+    response->set_signature("TODO");
+    response->add_certificate_chain("TODO");
+    return response;
+  }
+
+  void WritePolicy(const em::CloudPolicyResponse& policy) {
+    std::string data;
+    em::CachedCloudPolicyResponse cached_policy;
+    cached_policy.mutable_cloud_policy()->CopyFrom(policy);
+    EXPECT_TRUE(cached_policy.SerializeToString(&data));
+    int size = static_cast<int>(data.size());
+    EXPECT_EQ(size, file_util::WriteFile(test_file(), data.c_str(), size));
+  }
+
+  FilePath test_file() {
+    return temp_dir_.path().AppendASCII("CloudPolicyCacheTest");
+  }
+
+  bool Equals(const PolicyMapType& a, const PolicyMapType& b) const {
+    return CloudPolicyCache::Equals(a, b);
+  }
+
+  MessageLoop loop_;
+
+ private:
+  ScopedTempDir temp_dir_;
+  BrowserThread ui_thread_;
+  BrowserThread file_thread_;
+};
+
+TEST_F(CloudPolicyCacheTest, Equals) {
+  PolicyMapType a;
+  a.insert(std::make_pair(kPolicyHomepageLocation,
+                          Value::CreateStringValue("aaa")));
+  PolicyMapType a2;
+  a2.insert(std::make_pair(kPolicyHomepageLocation,
+                           Value::CreateStringValue("aaa")));
+  PolicyMapType b;
+  b.insert(std::make_pair(kPolicyHomepageLocation,
+                          Value::CreateStringValue("bbb")));
+  PolicyMapType c;
+  c.insert(std::make_pair(kPolicyHomepageLocation,
+                          Value::CreateStringValue("aaa")));
+  c.insert(std::make_pair(kPolicyHomepageIsNewTabPage,
+                          Value::CreateBooleanValue(true)));
+  EXPECT_FALSE(Equals(a, b));
+  EXPECT_FALSE(Equals(b, a));
+  EXPECT_FALSE(Equals(a, c));
+  EXPECT_FALSE(Equals(c, a));
+  EXPECT_TRUE(Equals(a, a2));
+  EXPECT_TRUE(Equals(a2, a));
+  PolicyMapType empty1;
+  PolicyMapType empty2;
+  EXPECT_TRUE(Equals(empty1, empty2));
+  EXPECT_TRUE(Equals(empty2, empty1));
+  EXPECT_FALSE(Equals(empty1, a));
+  EXPECT_FALSE(Equals(a, empty1));
+}
+
+TEST_F(CloudPolicyCacheTest, DecodePolicy) {
+  em::CloudPolicySettings settings;
+  settings.mutable_homepagelocation()->set_homepagelocation("chromium.org");
+  settings.mutable_javascriptenabled()->set_javascriptenabled(true);
+  settings.mutable_javascriptenabled()->mutable_policy_options()->set_mode(
+      em::PolicyOptions::MANDATORY);
+  settings.mutable_policyrefreshrate()->set_policyrefreshrate(5);
+  settings.mutable_policyrefreshrate()->mutable_policy_options()->set_mode(
+      em::PolicyOptions::RECOMMENDED);
+  PolicyMapType mandatory_policy;
+  PolicyMapType recommended_policy;
+  DecodePolicy(settings, &mandatory_policy, &recommended_policy);
+  PolicyMapType mandatory;
+  mandatory.insert(std::make_pair(kPolicyHomepageLocation,
+                                  Value::CreateStringValue("chromium.org")));
+  mandatory.insert(std::make_pair(kPolicyJavascriptEnabled,
+                                  Value::CreateBooleanValue(true)));
+  PolicyMapType recommended;
+  recommended.insert(std::make_pair(kPolicyPolicyRefreshRate,
+                                    Value::CreateIntegerValue(5)));
+  EXPECT_TRUE(Equals(mandatory, mandatory_policy));
+  EXPECT_TRUE(Equals(recommended, recommended_policy));
+}
+
+TEST_F(CloudPolicyCacheTest, DecodeIntegerValue) {
+  const int min = std::numeric_limits<int>::min();
+  const int max = std::numeric_limits<int>::max();
+  scoped_ptr<Value> value(
+      DecodeIntegerValue(static_cast<google::protobuf::int64>(42)));
+  ASSERT_TRUE(value.get());
+  EXPECT_TRUE(value->Equals(Value::CreateIntegerValue(42)));
+  value.reset(
+      DecodeIntegerValue(static_cast<google::protobuf::int64>(min - 1LL)));
+  EXPECT_EQ(NULL, value.get());
+  value.reset(DecodeIntegerValue(static_cast<google::protobuf::int64>(min)));
+  ASSERT_TRUE(value.get());
+  EXPECT_TRUE(value->Equals(Value::CreateIntegerValue(min)));
+  value.reset(
+      DecodeIntegerValue(static_cast<google::protobuf::int64>(max + 1LL)));
+  EXPECT_EQ(NULL, value.get());
+  value.reset(DecodeIntegerValue(static_cast<google::protobuf::int64>(max)));
+  ASSERT_TRUE(value.get());
+  EXPECT_TRUE(value->Equals(Value::CreateIntegerValue(max)));
+}
+
+TEST_F(CloudPolicyCacheTest, DecodeStringList) {
+  em::StringList string_list;
+  string_list.add_entries("ponies");
+  string_list.add_entries("more ponies");
+  scoped_ptr<ListValue> decoded(DecodeStringList(string_list));
+  ListValue expected;
+  expected.Append(Value::CreateStringValue("ponies"));
+  expected.Append(Value::CreateStringValue("more ponies"));
+  EXPECT_TRUE(decoded->Equals(&expected));
+}
+
+TEST_F(CloudPolicyCacheTest, Empty) {
+  CloudPolicyCache cache(test_file());
+  PolicyMapType empty;
+  EXPECT_TRUE(Equals(empty, *cache.GetMandatoryPolicy()));
+  EXPECT_TRUE(Equals(empty, *cache.GetRecommendedPolicy()));
+  EXPECT_EQ(base::Time(), cache.last_policy_refresh_time());
+}
+
+TEST_F(CloudPolicyCacheTest, LoadNoFile) {
+  CloudPolicyCache cache(test_file());
+  cache.LoadPolicyFromFile();
+  PolicyMapType empty;
+  EXPECT_TRUE(Equals(empty, *cache.GetMandatoryPolicy()));
+  EXPECT_EQ(base::Time(), cache.last_policy_refresh_time());
+}
+
+TEST_F(CloudPolicyCacheTest, RejectFuture) {
+  scoped_ptr<em::CloudPolicyResponse> policy_response(
+      CreateHomepagePolicy("", base::Time::NowFromSystemTime() +
+                               base::TimeDelta::FromMinutes(5),
+                           em::PolicyOptions::MANDATORY));
+  WritePolicy(*policy_response);
+  CloudPolicyCache cache(test_file());
+  cache.LoadPolicyFromFile();
+  PolicyMapType empty;
+  EXPECT_TRUE(Equals(empty, *cache.GetMandatoryPolicy()));
+  EXPECT_EQ(base::Time(), cache.last_policy_refresh_time());
+}
+
+TEST_F(CloudPolicyCacheTest, LoadWithFile) {
+  scoped_ptr<em::CloudPolicyResponse> policy_response(
+      CreateHomepagePolicy("", base::Time::NowFromSystemTime(),
+                           em::PolicyOptions::MANDATORY));
+  WritePolicy(*policy_response);
+  CloudPolicyCache cache(test_file());
+  cache.LoadPolicyFromFile();
+  PolicyMapType empty;
+  EXPECT_TRUE(Equals(empty, *cache.GetMandatoryPolicy()));
+  EXPECT_NE(base::Time(), cache.last_policy_refresh_time());
+  EXPECT_GE(base::Time::Now(), cache.last_policy_refresh_time());
+}
+
+TEST_F(CloudPolicyCacheTest, LoadWithData) {
+  scoped_ptr<em::CloudPolicyResponse> policy(
+      CreateHomepagePolicy("http://www.example.com",
+                           base::Time::NowFromSystemTime(),
+                           em::PolicyOptions::MANDATORY));
+  WritePolicy(*policy);
+  CloudPolicyCache cache(test_file());
+  cache.LoadPolicyFromFile();
+  PolicyMapType expected;
+  expected.insert(
+      std::make_pair(kPolicyHomepageLocation,
+                     Value::CreateStringValue("http://www.example.com")));
+  EXPECT_TRUE(Equals(expected, *cache.GetMandatoryPolicy()));
+}
+
+TEST_F(CloudPolicyCacheTest, SetPolicy) {
+  CloudPolicyCache cache(test_file());
+  scoped_ptr<em::CloudPolicyResponse> policy(
+      CreateHomepagePolicy("http://www.example.com",
+                           base::Time::NowFromSystemTime(),
+                           em::PolicyOptions::MANDATORY));
+  EXPECT_TRUE(cache.SetPolicy(*policy));
+  scoped_ptr<em::CloudPolicyResponse> policy2(
+      CreateHomepagePolicy("http://www.example.com",
+                           base::Time::NowFromSystemTime(),
+                           em::PolicyOptions::MANDATORY));
+  EXPECT_FALSE(cache.SetPolicy(*policy2));
+  PolicyMapType expected;
+  expected.insert(
+      std::make_pair(kPolicyHomepageLocation,
+                     Value::CreateStringValue("http://www.example.com")));
+  PolicyMapType empty;
+  EXPECT_TRUE(Equals(expected, *cache.GetMandatoryPolicy()));
+  EXPECT_TRUE(Equals(empty, *cache.GetRecommendedPolicy()));
+  policy.reset(CreateHomepagePolicy("http://www.example.com",
+                                    base::Time::NowFromSystemTime(),
+                                    em::PolicyOptions::RECOMMENDED));
+  EXPECT_TRUE(cache.SetPolicy(*policy));
+  EXPECT_TRUE(Equals(expected, *cache.GetRecommendedPolicy()));
+  EXPECT_TRUE(Equals(empty, *cache.GetMandatoryPolicy()));
+}
+
+TEST_F(CloudPolicyCacheTest, ResetPolicy) {
+  CloudPolicyCache cache(test_file());
+
+  scoped_ptr<em::CloudPolicyResponse> policy(
+      CreateHomepagePolicy("http://www.example.com",
+                           base::Time::NowFromSystemTime(),
+                           em::PolicyOptions::MANDATORY));
+  EXPECT_TRUE(cache.SetPolicy(*policy));
+  PolicyMapType expected;
+  expected.insert(
+      std::make_pair(kPolicyHomepageLocation,
+                     Value::CreateStringValue("http://www.example.com")));
+  EXPECT_TRUE(Equals(expected, *cache.GetMandatoryPolicy()));
+
+  scoped_ptr<em::CloudPolicyResponse> empty_policy(
+      CreateHomepagePolicy("", base::Time::NowFromSystemTime(),
+                           em::PolicyOptions::MANDATORY));
+  EXPECT_TRUE(cache.SetPolicy(*empty_policy));
+  PolicyMapType empty;
+  EXPECT_TRUE(Equals(empty, *cache.GetMandatoryPolicy()));
+}
+
+TEST_F(CloudPolicyCacheTest, PersistPolicy) {
+  {
+    CloudPolicyCache cache(test_file());
+    scoped_ptr<em::CloudPolicyResponse> policy(
+        CreateHomepagePolicy("http://www.example.com",
+                             base::Time::NowFromSystemTime(),
+                             em::PolicyOptions::MANDATORY));
+    cache.SetPolicy(*policy);
+  }
+
+  loop_.RunAllPending();
+
+  EXPECT_TRUE(file_util::PathExists(test_file()));
+  CloudPolicyCache cache(test_file());
+  cache.LoadPolicyFromFile();
+  PolicyMapType expected;
+  expected.insert(
+      std::make_pair(kPolicyHomepageLocation,
+                     Value::CreateStringValue("http://www.example.com")));
+  EXPECT_TRUE(Equals(expected, *cache.GetMandatoryPolicy()));
+}
+
+TEST_F(CloudPolicyCacheTest, FreshPolicyOverride) {
+  scoped_ptr<em::CloudPolicyResponse> policy(
+      CreateHomepagePolicy("http://www.example.com",
+                           base::Time::NowFromSystemTime(),
+                           em::PolicyOptions::MANDATORY));
+  WritePolicy(*policy);
+
+  CloudPolicyCache cache(test_file());
+  scoped_ptr<em::CloudPolicyResponse> updated_policy(
+      CreateHomepagePolicy("http://www.chromium.org",
+                           base::Time::NowFromSystemTime(),
+                           em::PolicyOptions::MANDATORY));
+  EXPECT_TRUE(cache.SetPolicy(*updated_policy));
+
+  cache.LoadPolicyFromFile();
+  PolicyMapType expected;
+  expected.insert(
+      std::make_pair(kPolicyHomepageLocation,
+                     Value::CreateStringValue("http://www.chromium.org")));
+  EXPECT_TRUE(Equals(expected, *cache.GetMandatoryPolicy()));
+}
+
+}  // namespace policy
+
+// ==================================================================
+// Everything below this line can go when we phase out support for
+// the old (trusted testing/pilot program) policy format.
+
+// This is a (slightly updated) copy of the old
+// device_management_policy_cache_unittest.cc. The new CloudPolicyCache
+// supports the old DMPC's interface for now (until it is phased out), so for
+// this transitional period, we keep these old test cases but apply them to the
+// new implementation (CPC).
+
+namespace policy {
+
+// Wraps base functionaly for the test cases.
+class DeviceManagementPolicyCacheTestBase : public testing::Test {
+ protected:
+  // Add a string policy setting to a policy response message.
+  void AddStringPolicy(em::DevicePolicyResponse* policy,
+                       const std::string& name,
+                       const std::string& value) {
+    em::DevicePolicySetting* setting = policy->add_setting();
+    setting->set_policy_key(kChromeDevicePolicySettingKey);
+    em::GenericSetting* policy_value = setting->mutable_policy_value();
+    em::GenericNamedValue* named_value = policy_value->add_named_value();
+    named_value->set_name(name);
+    em::GenericValue* value_container = named_value->mutable_value();
+    value_container->set_value_type(em::GenericValue::VALUE_TYPE_STRING);
+    value_container->set_string_value(value);
+  }
+};
+
+// Tests the device management policy cache.
+class DeviceManagementPolicyCacheTest
+    : public DeviceManagementPolicyCacheTestBase {
+ protected:
+  DeviceManagementPolicyCacheTest()
+      : loop_(MessageLoop::TYPE_UI),
+        ui_thread_(BrowserThread::UI, &loop_),
+        file_thread_(BrowserThread::FILE, &loop_) {}
+
+  void SetUp() {
+    ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
+  }
+
+  void TearDown() {
+    loop_.RunAllPending();
+  }
+
+  void WritePolicy(const em::DevicePolicyResponse& policy,
+                   const base::Time& timestamp) {
+    std::string data;
+    em::CachedCloudPolicyResponse cached_policy;
+    cached_policy.mutable_device_policy()->CopyFrom(policy);
+    cached_policy.set_timestamp(timestamp.ToTimeT());
+    EXPECT_TRUE(cached_policy.SerializeToString(&data));
+    int size = static_cast<int>(data.size());
+    EXPECT_EQ(size, file_util::WriteFile(test_file(), data.c_str(), size));
+  }
+
+  FilePath test_file() {
+    return temp_dir_.path().AppendASCII("DeviceManagementPolicyCacheTest");
+  }
+
+ protected:
+  MessageLoop loop_;
+
+ private:
+  ScopedTempDir temp_dir_;
+  BrowserThread ui_thread_;
+  BrowserThread file_thread_;
+};
+
+TEST_F(DeviceManagementPolicyCacheTest, Empty) {
+  CloudPolicyCache cache(test_file());
+  DictionaryValue empty;
+  scoped_ptr<Value> policy(cache.GetDevicePolicy());
+  EXPECT_TRUE(empty.Equals(policy.get()));
+  EXPECT_EQ(base::Time(), cache.last_policy_refresh_time());
+}
+
+TEST_F(DeviceManagementPolicyCacheTest, LoadNoFile) {
+  CloudPolicyCache cache(test_file());
+  cache.LoadPolicyFromFile();
+  DictionaryValue empty;
+  scoped_ptr<Value> policy(cache.GetDevicePolicy());
+  EXPECT_TRUE(empty.Equals(policy.get()));
+  EXPECT_EQ(base::Time(), cache.last_policy_refresh_time());
+}
+
+TEST_F(DeviceManagementPolicyCacheTest, RejectFuture) {
+  em::DevicePolicyResponse policy_response;
+  WritePolicy(policy_response, base::Time::NowFromSystemTime() +
+                               base::TimeDelta::FromMinutes(5));
+  CloudPolicyCache cache(test_file());
+  cache.LoadPolicyFromFile();
+  DictionaryValue empty;
+  scoped_ptr<Value> policy(cache.GetDevicePolicy());
+  EXPECT_TRUE(empty.Equals(policy.get()));
+  EXPECT_EQ(base::Time(), cache.last_policy_refresh_time());
+}
+
+TEST_F(DeviceManagementPolicyCacheTest, LoadWithFile) {
+  em::DevicePolicyResponse policy_response;
+  WritePolicy(policy_response, base::Time::NowFromSystemTime());
+  CloudPolicyCache cache(test_file());
+  cache.LoadPolicyFromFile();
+  DictionaryValue empty;
+  scoped_ptr<Value> policy(cache.GetDevicePolicy());
+  EXPECT_TRUE(empty.Equals(policy.get()));
+  EXPECT_NE(base::Time(), cache.last_policy_refresh_time());
+  EXPECT_GE(base::Time::Now(), cache.last_policy_refresh_time());
+}
+
+TEST_F(DeviceManagementPolicyCacheTest, LoadWithData) {
+  em::DevicePolicyResponse policy;
+  AddStringPolicy(&policy, "HomepageLocation", "http://www.example.com");
+  WritePolicy(policy, base::Time::NowFromSystemTime());
+  CloudPolicyCache cache(test_file());
+  cache.LoadPolicyFromFile();
+  DictionaryValue expected;
+  expected.Set("HomepageLocation",
+               Value::CreateStringValue("http://www.example.com"));
+  scoped_ptr<Value> policy_value(cache.GetDevicePolicy());
+  EXPECT_TRUE(expected.Equals(policy_value.get()));
+}
+
+TEST_F(DeviceManagementPolicyCacheTest, SetDevicePolicy) {
+  CloudPolicyCache cache(test_file());
+  em::DevicePolicyResponse policy;
+  AddStringPolicy(&policy, "HomepageLocation", "http://www.example.com");
+  EXPECT_TRUE(cache.SetDevicePolicy(policy));
+  em::DevicePolicyResponse policy2;
+  AddStringPolicy(&policy2, "HomepageLocation", "http://www.example.com");
+  EXPECT_FALSE(cache.SetDevicePolicy(policy2));
+  DictionaryValue expected;
+  expected.Set("HomepageLocation",
+               Value::CreateStringValue("http://www.example.com"));
+  scoped_ptr<Value> policy_value(cache.GetDevicePolicy());
+  EXPECT_TRUE(expected.Equals(policy_value.get()));
+}
+
+TEST_F(DeviceManagementPolicyCacheTest, ResetPolicy) {
+  CloudPolicyCache cache(test_file());
+
+  em::DevicePolicyResponse policy;
+  AddStringPolicy(&policy, "HomepageLocation", "http://www.example.com");
+  EXPECT_TRUE(cache.SetDevicePolicy(policy));
+  DictionaryValue expected;
+  expected.Set("HomepageLocation",
+               Value::CreateStringValue("http://www.example.com"));
+  scoped_ptr<Value> policy_value(cache.GetDevicePolicy());
+  EXPECT_TRUE(expected.Equals(policy_value.get()));
+
+  EXPECT_TRUE(cache.SetDevicePolicy(em::DevicePolicyResponse()));
+  policy_value.reset(cache.GetDevicePolicy());
+  DictionaryValue empty;
+  EXPECT_TRUE(empty.Equals(policy_value.get()));
+}
+
+TEST_F(DeviceManagementPolicyCacheTest, PersistPolicy) {
+  {
+    CloudPolicyCache cache(test_file());
+    em::DevicePolicyResponse policy;
+    AddStringPolicy(&policy, "HomepageLocation", "http://www.example.com");
+    cache.SetDevicePolicy(policy);
+  }
+
+  loop_.RunAllPending();
+
+  EXPECT_TRUE(file_util::PathExists(test_file()));
+  CloudPolicyCache cache(test_file());
+  cache.LoadPolicyFromFile();
+  DictionaryValue expected;
+  expected.Set("HomepageLocation",
+               Value::CreateStringValue("http://www.example.com"));
+  scoped_ptr<Value> policy_value(cache.GetDevicePolicy());
+  EXPECT_TRUE(expected.Equals(policy_value.get()));
+}
+
+TEST_F(DeviceManagementPolicyCacheTest, FreshPolicyOverride) {
+  em::DevicePolicyResponse policy;
+  AddStringPolicy(&policy, "HomepageLocation", "http://www.example.com");
+  WritePolicy(policy, base::Time::NowFromSystemTime());
+
+  CloudPolicyCache cache(test_file());
+  em::DevicePolicyResponse updated_policy;
+  AddStringPolicy(&updated_policy, "HomepageLocation",
+                  "http://www.chromium.org");
+  EXPECT_TRUE(cache.SetDevicePolicy(updated_policy));
+
+  cache.LoadPolicyFromFile();
+  DictionaryValue expected;
+  expected.Set("HomepageLocation",
+               Value::CreateStringValue("http://www.chromium.org"));
+  scoped_ptr<Value> policy_value(cache.GetDevicePolicy());
+  EXPECT_TRUE(expected.Equals(policy_value.get()));
+}
+
+// Tests proper decoding of policy values.
+class DeviceManagementPolicyCacheDecodeTest
+    : public DeviceManagementPolicyCacheTestBase {
+ protected:
+  void DecodeAndCheck(Value* expected_value_ptr) {
+    scoped_ptr<Value> expected_value(expected_value_ptr);
+    scoped_ptr<Value> decoded_value(
+        CloudPolicyCache::DecodeValue(value_));
+    if (expected_value_ptr) {
+      ASSERT_TRUE(decoded_value.get());
+      EXPECT_TRUE(decoded_value->Equals(expected_value.get()));
+    } else {
+      ASSERT_FALSE(decoded_value.get());
+    }
+  }
+
+  DictionaryValue* DecodeDevicePolicy(const em::DevicePolicyResponse policy) {
+    return CloudPolicyCache::DecodeDevicePolicy(policy);
+  }
+
+  em::GenericValue value_;
+};
+
+TEST_F(DeviceManagementPolicyCacheDecodeTest, Bool) {
+  value_.set_value_type(em::GenericValue::VALUE_TYPE_BOOL);
+  value_.set_bool_value(true);
+  DecodeAndCheck(Value::CreateBooleanValue(true));
+}
+
+TEST_F(DeviceManagementPolicyCacheDecodeTest, Int64) {
+  value_.set_value_type(em::GenericValue::VALUE_TYPE_INT64);
+  value_.set_int64_value(42);
+  DecodeAndCheck(Value::CreateIntegerValue(42));
+}
+
+TEST_F(DeviceManagementPolicyCacheDecodeTest, Int64Overflow) {
+  const int min = std::numeric_limits<int>::min();
+  const int max = std::numeric_limits<int>::max();
+  value_.set_value_type(em::GenericValue::VALUE_TYPE_INT64);
+  value_.set_int64_value(min - 1LL);
+  DecodeAndCheck(NULL);
+  value_.set_int64_value(max + 1LL);
+  DecodeAndCheck(NULL);
+  value_.set_int64_value(min);
+  DecodeAndCheck(Value::CreateIntegerValue(min));
+  value_.set_int64_value(max);
+  DecodeAndCheck(Value::CreateIntegerValue(max));
+}
+
+TEST_F(DeviceManagementPolicyCacheDecodeTest, String) {
+  value_.set_value_type(em::GenericValue::VALUE_TYPE_STRING);
+  value_.set_string_value("ponies!");
+  DecodeAndCheck(Value::CreateStringValue("ponies!"));
+}
+
+TEST_F(DeviceManagementPolicyCacheDecodeTest, Double) {
+  value_.set_value_type(em::GenericValue::VALUE_TYPE_DOUBLE);
+  value_.set_double_value(0.42L);
+  DecodeAndCheck(Value::CreateDoubleValue(0.42L));
+}
+
+TEST_F(DeviceManagementPolicyCacheDecodeTest, Bytes) {
+  std::string data("binary ponies.");
+  value_.set_value_type(em::GenericValue::VALUE_TYPE_BYTES);
+  value_.set_bytes_value(data);
+  DecodeAndCheck(
+      BinaryValue::CreateWithCopiedBuffer(data.c_str(), data.size()));
+}
+
+TEST_F(DeviceManagementPolicyCacheDecodeTest, BoolArray) {
+  value_.set_value_type(em::GenericValue::VALUE_TYPE_BOOL_ARRAY);
+  value_.add_bool_array(false);
+  value_.add_bool_array(true);
+  ListValue* list = new ListValue;
+  list->Append(Value::CreateBooleanValue(false));
+  list->Append(Value::CreateBooleanValue(true));
+  DecodeAndCheck(list);
+}
+
+TEST_F(DeviceManagementPolicyCacheDecodeTest, Int64Array) {
+  value_.set_value_type(em::GenericValue::VALUE_TYPE_INT64_ARRAY);
+  value_.add_int64_array(42);
+  value_.add_int64_array(17);
+  ListValue* list = new ListValue;
+  list->Append(Value::CreateIntegerValue(42));
+  list->Append(Value::CreateIntegerValue(17));
+  DecodeAndCheck(list);
+}
+
+TEST_F(DeviceManagementPolicyCacheDecodeTest, StringArray) {
+  value_.set_value_type(em::GenericValue::VALUE_TYPE_STRING_ARRAY);
+  value_.add_string_array("ponies");
+  value_.add_string_array("more ponies");
+  ListValue* list = new ListValue;
+  list->Append(Value::CreateStringValue("ponies"));
+  list->Append(Value::CreateStringValue("more ponies"));
+  DecodeAndCheck(list);
+}
+
+TEST_F(DeviceManagementPolicyCacheDecodeTest, DoubleArray) {
+  value_.set_value_type(em::GenericValue::VALUE_TYPE_DOUBLE_ARRAY);
+  value_.add_double_array(0.42L);
+  value_.add_double_array(0.17L);
+  ListValue* list = new ListValue;
+  list->Append(Value::CreateDoubleValue(0.42L));
+  list->Append(Value::CreateDoubleValue(0.17L));
+  DecodeAndCheck(list);
+}
+
+TEST_F(DeviceManagementPolicyCacheDecodeTest, DecodePolicy) {
+  em::DevicePolicyResponse policy;
+  AddStringPolicy(&policy, "HomepageLocation", "http://www.example.com");
+  scoped_ptr<Value> decoded(DecodeDevicePolicy(policy));
+  DictionaryValue expected;
+  expected.Set("HomepageLocation",
+               Value::CreateStringValue("http://www.example.com"));
+  EXPECT_TRUE(expected.Equals(decoded.get()));
+}
+
+}  // namespace policy