Update from https://crrev.com/304418

net/base/network_activity_monitor_unittest.cc

+// Copyright (c) 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/network_activity_monitor.h"
+
+#include <vector>
+
+#include "base/bind.h"
+#include "base/port.h"
+#include "base/stl_util.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/synchronization/lock.h"
+#include "base/threading/thread.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace net {
+
+namespace test {
+
+class NetworkActivityMonitorPeer {
+ public:
+  static void ResetMonitor() {
+    NetworkActivityMonitor* monitor = NetworkActivityMonitor::GetInstance();
+    base::AutoLock lock(monitor->lock_);
+    monitor->bytes_sent_ = 0;
+    monitor->bytes_received_ = 0;
+    monitor->last_received_ticks_ = base::TimeTicks();
+    monitor->last_sent_ticks_ = base::TimeTicks();
+  }
+};
+
+
+class NetworkActivityMontiorTest : public testing::Test {
+ public:
+  NetworkActivityMontiorTest() {
+    NetworkActivityMonitorPeer::ResetMonitor();
+  }
+};
+
+TEST_F(NetworkActivityMontiorTest, GetInstance) {
+  NetworkActivityMonitor* monitor = NetworkActivityMonitor::GetInstance();
+  EXPECT_TRUE(monitor != NULL);
+  EXPECT_TRUE(monitor == NetworkActivityMonitor::GetInstance());
+}
+
+TEST_F(NetworkActivityMontiorTest, BytesReceived) {
+  NetworkActivityMonitor* monitor = NetworkActivityMonitor::GetInstance();
+
+  EXPECT_EQ(0u, monitor->GetBytesReceived());
+
+  base::TimeTicks start = base::TimeTicks::Now();
+  uint64_t bytes = 12345;
+  monitor->IncrementBytesReceived(bytes);
+  EXPECT_EQ(bytes, monitor->GetBytesReceived());
+  base::TimeDelta delta = monitor->GetTimeSinceLastReceived();
+  EXPECT_LE(base::TimeDelta(), delta);
+  EXPECT_GE(base::TimeTicks::Now() - start, delta);
+}
+
+TEST_F(NetworkActivityMontiorTest, BytesSent) {
+  NetworkActivityMonitor* monitor = NetworkActivityMonitor::GetInstance();
+
+  EXPECT_EQ(0u, monitor->GetBytesSent());
+
+  base::TimeTicks start = base::TimeTicks::Now();
+  uint64_t bytes = 12345;
+  monitor->IncrementBytesSent(bytes);
+  EXPECT_EQ(bytes, monitor->GetBytesSent());
+  base::TimeDelta delta = monitor->GetTimeSinceLastSent();
+  EXPECT_LE(base::TimeDelta(), delta);
+  EXPECT_GE(base::TimeTicks::Now() - start, delta);
+}
+
+namespace {
+
+void VerifyBytesReceivedIsMultipleOf(uint64_t bytes) {
+  EXPECT_EQ(0u,
+            NetworkActivityMonitor::GetInstance()->GetBytesReceived() % bytes);
+}
+
+void VerifyBytesSentIsMultipleOf(uint64_t bytes) {
+  EXPECT_EQ(0u, NetworkActivityMonitor::GetInstance()->GetBytesSent() % bytes);
+}
+
+void IncrementBytesReceived(uint64_t bytes) {
+  NetworkActivityMonitor::GetInstance()->IncrementBytesReceived(bytes);
+}
+
+void IncrementBytesSent(uint64_t bytes) {
+  NetworkActivityMonitor::GetInstance()->IncrementBytesSent(bytes);
+}
+
+}  // namespace
+
+TEST_F(NetworkActivityMontiorTest, Threading) {
+  std::vector<base::Thread*> threads;
+  for (size_t i = 0; i < 3; ++i) {
+    threads.push_back(new base::Thread(base::UintToString(i)));
+    ASSERT_TRUE(threads.back()->Start());
+  }
+
+  size_t num_increments = 157;
+  uint64_t bytes_received = GG_UINT64_C(7294954321);
+  uint64_t bytes_sent = GG_UINT64_C(91294998765);
+  for (size_t i = 0; i < num_increments; ++i) {
+    size_t thread_num = i % threads.size();
+    threads[thread_num]->task_runner()->PostTask(
+        FROM_HERE,
+        base::Bind(&IncrementBytesReceived, bytes_received));
+    threads[thread_num]->task_runner()->PostTask(
+        FROM_HERE,
+        base::Bind(&IncrementBytesSent, bytes_sent));
+    threads[thread_num]->task_runner()->PostTask(
+        FROM_HERE,
+        base::Bind(&VerifyBytesSentIsMultipleOf, bytes_sent));
+    threads[thread_num]->task_runner()->PostTask(
+        FROM_HERE,
+        base::Bind(&VerifyBytesReceivedIsMultipleOf, bytes_received));
+  }
+
+  STLDeleteElements(&threads);
+
+  NetworkActivityMonitor* monitor = NetworkActivityMonitor::GetInstance();
+  EXPECT_EQ(num_increments * bytes_received, monitor->GetBytesReceived());
+  EXPECT_EQ(num_increments * bytes_sent, monitor->GetBytesSent());
+}
+
+}  // namespace test
+
+}  // namespace net