Deciding best connection to schedule requests on based on cwnd and idle time (Reopened after revert)

chrome/browser/browser_main_unittest.cc

+// 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/browser_main.h"
+
+#include <string>
+#include <vector>
+#include "base/command_line.h"
+#include "chrome/common/chrome_switches.h"
+#include "chrome/test/testing_pref_service.h"
+#include "content/common/main_function_params.h"
+#include "content/common/sandbox_init_wrapper.h"
+#include "net/socket/client_socket_pool_base.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+class BrowserMainTest : public testing::Test {
+ public:
+  BrowserMainTest() : command_line_(CommandLine::NO_PROGRAM) {}
+ protected:
+  virtual void SetUp() {
+    sandbox_init_wrapper_.reset(new SandboxInitWrapper());
+  }
+
+  scoped_ptr<SandboxInitWrapper> sandbox_init_wrapper_;
+  TestingPrefService pref_service_;
+  CommandLine command_line_;
+};
+
+TEST_F(BrowserMainTest, WarmConnectionFieldTrial_WarmestSocket) {
+  command_line_.AppendSwitchASCII(switches::kSocketReusePolicy, "0");
+
+  scoped_ptr<MainFunctionParams> params(
+      new MainFunctionParams(command_line_, *sandbox_init_wrapper_, NULL));
+  scoped_ptr<BrowserMainParts> bw(BrowserMainParts::CreateBrowserMainParts(
+      *params));
+
+  bw->WarmConnectionFieldTrial();
+
+  EXPECT_EQ(0, net::GetSocketReusePolicy());
+}
+
+TEST_F(BrowserMainTest, WarmConnectionFieldTrial_Random) {
+  scoped_ptr<MainFunctionParams> params(
+      new MainFunctionParams(command_line_, *sandbox_init_wrapper_, NULL));
+  scoped_ptr<BrowserMainParts> bw(BrowserMainParts::CreateBrowserMainParts(
+      *params));
+
+  const int kNumRuns = 1000;
+  for (int i = 0; i < kNumRuns; i++) {
+    bw->WarmConnectionFieldTrial();
+    int val = net::GetSocketReusePolicy();
+    EXPECT_LE(val, 2);
+    EXPECT_GE(val, 0);
+  }
+}
+
+TEST_F(BrowserMainTest, WarmConnectionFieldTrial_Invalid) {
+  command_line_.AppendSwitchASCII(switches::kSocketReusePolicy, "100");
+
+  scoped_ptr<MainFunctionParams> params(
+      new MainFunctionParams(command_line_, *sandbox_init_wrapper_, NULL));
+  scoped_ptr<BrowserMainParts> bw(BrowserMainParts::CreateBrowserMainParts(
+      *params));
+
+  EXPECT_DEBUG_DEATH(bw->WarmConnectionFieldTrial(),
+                     "Not a valid socket reuse policy group");
+}