Add function to get network stack state from a URLRequestContext.

net/base/net_log_util_unittest.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.

[eroman, 2014/10/28 21:59:41]

On a side note: I think we are at the point where net_logging could get its own
top level directory.

Something like:

net/logging

[mmenke, 2014/10/29 15:44:55]

Makes sense.

Such a CL would also be a good time to move BoundNetLog into its own file.  I'd
really like to make it not include NetLog in its header file, since including
NetLog everywhere includes a bunch extra files everywhere that depends on the
net stack.  Of course, to do that, we'd need to move NetLog enums outside of
NetLog as well, which would get pretty ugly.

+// 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