Implement offline mode behind a flag

content/browser/loader/offline_policy_unittest.cc

+// Copyright (c) 2013 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 "content/browser/loader/offline_policy.h"
+
+#include "base/command_line.h"
+#include "content/public/common/content_switches.h"
+#include "net/base/load_flags.h"
+#include "net/http/http_response_info.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "webkit/glue/resource_type.h"
+
+namespace content {
+
+class OfflinePolicyTest : public testing::Test {
+ public:
+  virtual void SetUp() {
+    CommandLine::ForCurrentProcess()->AppendSwitch(
+        switches::kEnableOfflineCacheAccess);
+  }
+
+ protected:
+  OfflinePolicy policy_;
+};
+
+// Confirm that the initial state of an offline object is to return
+// LOAD_FROM_CACHE_IF_OFFLINE until it gets changed.
+TEST_F(OfflinePolicyTest, InitialState) {
+  // Two loads from the same route.
+  EXPECT_EQ(net::LOAD_FROM_CACHE_IF_OFFLINE,
+            policy_.GetAdditionalLoadFlags(0, 0, 0, ResourceType::MAIN_FRAME));
+  EXPECT_EQ(net::LOAD_FROM_CACHE_IF_OFFLINE,
+            policy_.GetAdditionalLoadFlags(0, 0, 0, ResourceType::IMAGE));
+
+  // Two loads from two different routes, not MAIN_FRAME.
+  EXPECT_EQ(net::LOAD_FROM_CACHE_IF_OFFLINE,
+            policy_.GetAdditionalLoadFlags(0, 1, 0, ResourceType::OBJECT));
+  EXPECT_EQ(net::LOAD_FROM_CACHE_IF_OFFLINE,
+            policy_.GetAdditionalLoadFlags(1, 1, 0, ResourceType::OBJECT));
+}
+
+// Completion without any network probing doesn't change result value.
+TEST_F(OfflinePolicyTest, CompletedUncertain) {
+  EXPECT_EQ(net::LOAD_FROM_CACHE_IF_OFFLINE,
+            policy_.GetAdditionalLoadFlags(0, 0, 0, ResourceType::MAIN_FRAME));
+  net::HttpResponseInfo response_info;
+  policy_.RequestCompleted(0, 0, response_info);
+  EXPECT_EQ(net::LOAD_FROM_CACHE_IF_OFFLINE,
+            policy_.GetAdditionalLoadFlags(0, 0, 0, ResourceType::OBJECT));
+}
+
+// Completion with a failed network probe changes result value.
+TEST_F(OfflinePolicyTest, CompletedNoNetwork) {
+  EXPECT_EQ(net::LOAD_FROM_CACHE_IF_OFFLINE,
+            policy_.GetAdditionalLoadFlags(0, 0, 0, ResourceType::MAIN_FRAME));
+  net::HttpResponseInfo response_info;
+  response_info.server_data_unavailable = true;
+  policy_.RequestCompleted(0, 0, response_info);
+  EXPECT_EQ(net::LOAD_ONLY_FROM_CACHE,
+            policy_.GetAdditionalLoadFlags(0, 0, 0, ResourceType::OBJECT));
+}
+
+// Completion with a successful network probe changes result value.
+TEST_F(OfflinePolicyTest, CompletedNetwork) {
+  EXPECT_EQ(net::LOAD_FROM_CACHE_IF_OFFLINE,
+            policy_.GetAdditionalLoadFlags(0, 0, 0, ResourceType::MAIN_FRAME));
+  net::HttpResponseInfo response_info;
+  response_info.network_accessed = true;
+  policy_.RequestCompleted(0, 0, response_info);
+  EXPECT_EQ(0, policy_.GetAdditionalLoadFlags(0, 0, 0, ResourceType::OBJECT));
+}
+
+// A new navigation resets a state change.
+TEST_F(OfflinePolicyTest, NewNavigationReset) {
+  EXPECT_EQ(net::LOAD_FROM_CACHE_IF_OFFLINE,
+            policy_.GetAdditionalLoadFlags(0, 0, 0, ResourceType::MAIN_FRAME));
+  net::HttpResponseInfo response_info;
+  response_info.network_accessed = true;
+  policy_.RequestCompleted(0, 0, response_info);
+  EXPECT_EQ(0, policy_.GetAdditionalLoadFlags(0, 0, 0, ResourceType::OBJECT));
+  EXPECT_EQ(net::LOAD_FROM_CACHE_IF_OFFLINE,
+            policy_.GetAdditionalLoadFlags(0, 0, 0, ResourceType::MAIN_FRAME));
+  EXPECT_EQ(net::LOAD_FROM_CACHE_IF_OFFLINE,
+            policy_.GetAdditionalLoadFlags(0, 0, 0, ResourceType::OBJECT));
+}
+
+// Cache related flags inhibit the returning of any special flags.
+TEST_F(OfflinePolicyTest, ConsumerFlagOverride) {
+  EXPECT_EQ(0, policy_.GetAdditionalLoadFlags(0, 0, net::LOAD_BYPASS_CACHE,
+                                              ResourceType::MAIN_FRAME));
+  net::HttpResponseInfo response_info;
+  response_info.server_data_unavailable = true;
+  policy_.RequestCompleted(0, 0, response_info);
+  EXPECT_EQ(0,
+            policy_.GetAdditionalLoadFlags(0, 0, net::LOAD_BYPASS_CACHE,
+                                           ResourceType::OBJECT));
+}
+
+// Different routes can be in different states.
+TEST_F(OfflinePolicyTest, SeparateRouteStates) {
+  EXPECT_EQ(net::LOAD_FROM_CACHE_IF_OFFLINE,
+            policy_.GetAdditionalLoadFlags(0, 0, 0, ResourceType::MAIN_FRAME));
+  EXPECT_EQ(net::LOAD_FROM_CACHE_IF_OFFLINE,
+            policy_.GetAdditionalLoadFlags(1, 0, 0, ResourceType::MAIN_FRAME));
+  net::HttpResponseInfo response_info;
+  response_info.server_data_unavailable = true;
+  policy_.RequestCompleted(0, 0, response_info);
+  EXPECT_EQ(net::LOAD_ONLY_FROM_CACHE,
+            policy_.GetAdditionalLoadFlags(0, 0, 0, ResourceType::OBJECT));
+  EXPECT_EQ(net::LOAD_FROM_CACHE_IF_OFFLINE,
+            policy_.GetAdditionalLoadFlags(1, 0, 0, ResourceType::OBJECT));
+}
+
+}