Add function to get network stack state from a URLRequestContext.

net/base/net_log_util_unittest.cc

Index: net/base/net_log_util_unittest.cc
diff --git a/net/base/net_log_util_unittest.cc b/net/base/net_log_util_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e5cc3a33fb2479566b5d87f9f9496a2ce6dd226f
--- /dev/null
+++ b/net/base/net_log_util_unittest.cc
@@ -0,0 +1,54 @@
+// Copyright 2014 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 "net/base/net_log_util.h"
+
+#include "base/memory/scoped_ptr.h"
+#include "base/values.h"
+#include "net/base/net_errors.h"
+#include "net/base/test_completion_callback.h"
+#include "net/http/http_cache.h"
+#include "net/http/http_transaction.h"
+#include "net/url_request/url_request_test_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace net {
+
+namespace {
+
+// Make sure GetNetConstants doesn't crash.
+TEST(NetLogUtil, GetNetConstants) {
+  scoped_ptr<base::Value> constants(GetNetConstants());
+}
+
+// Make sure GetNetInfo doesn't crash when called on contexts with and without
+// caches, and they have the same number of elements.
+TEST(NetLogUtil, GetNetInfo) {
+  TestURLRequestContext context;
+  net::HttpCache* http_cache = context.http_transaction_factory()->GetCache();
+
+  // Get NetInfo when there's no cache backend (It's only created on first use).
+  EXPECT_FALSE(http_cache->GetCurrentBackend());
+  scoped_ptr<base::DictionaryValue> net_info_without_cache(
+      GetNetInfo(&context, NET_INFO_ALL_SOURCES));
+  EXPECT_FALSE(http_cache->GetCurrentBackend());
+  EXPECT_GT(net_info_without_cache->size(), 0u);
+
+  // Fore creation of a cache backend, and get NetInfo again.
+  disk_cache::Backend* backend = NULL;
+  EXPECT_EQ(
+      OK,
+      context.http_transaction_factory()->GetCache()->GetBackend(
+          &backend, TestCompletionCallback().callback()));
+  EXPECT_TRUE(http_cache->GetCurrentBackend());
+  scoped_ptr<base::DictionaryValue> net_info_with_cache(
+      GetNetInfo(&context, NET_INFO_ALL_SOURCES));
+  EXPECT_GT(net_info_with_cache->size(), 0u);
+
+  EXPECT_EQ(net_info_without_cache->size(), net_info_with_cache->size());
+}
+
+}  // namespace
+
+}  // namespace net