Round results of multiplying QuicBandwidth and QuicTime::Delta rather than truncating. No behavior…

net/quic/core/quic_bandwidth_test.cc

 // Copyright (c) 2012 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/quic/core/quic_bandwidth.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace net {
 namespace test {
 
@@ skipping 45 matching lines @@
                 1000, QuicTime::Delta::FromMilliseconds(100)));
 }
 
 TEST_F(QuicBandwidthTest, Scale) {
   EXPECT_EQ(QuicBandwidth::FromKBytesPerSecond(500),
             QuicBandwidth::FromKBytesPerSecond(1000) * 0.5f);
   EXPECT_EQ(QuicBandwidth::FromKBytesPerSecond(750),
             0.75f * QuicBandwidth::FromKBytesPerSecond(1000));
   EXPECT_EQ(QuicBandwidth::FromKBytesPerSecond(1250),
             QuicBandwidth::FromKBytesPerSecond(1000) * 1.25f);
+
+  // Ensure we are rounding correctly within a 1bps level of precision.
+  EXPECT_EQ(QuicBandwidth::FromBitsPerSecond(5),
+            QuicBandwidth::FromBitsPerSecond(9) * 0.5);
+  EXPECT_EQ(QuicBandwidth::FromBitsPerSecond(2),
+            QuicBandwidth::FromBitsPerSecond(12) * 0.2);
 }
 
 TEST_F(QuicBandwidthTest, BytesPerPeriod) {
   EXPECT_EQ(2000u, QuicBandwidth::FromKBytesPerSecond(2000)
                        .ToBytesPerPeriod(QuicTime::Delta::FromMilliseconds(1)));
   EXPECT_EQ(2u, QuicBandwidth::FromKBytesPerSecond(2000)
                     .ToKBytesPerPeriod(QuicTime::Delta::FromMilliseconds(1)));
   EXPECT_EQ(200000u, QuicBandwidth::FromKBytesPerSecond(2000).ToBytesPerPeriod(
                          QuicTime::Delta::FromMilliseconds(100)));
   EXPECT_EQ(200u, QuicBandwidth::FromKBytesPerSecond(2000).ToKBytesPerPeriod(
@@ skipping 30 matching lines @@
 
   bandwidth = bandwidth * 1000;
   EXPECT_EQ("400.00 Mbits/s (50.00 Mbytes/s)", bandwidth.ToDebugValue());
 
   bandwidth = bandwidth * 1000;
   EXPECT_EQ("400.00 Gbits/s (50.00 Gbytes/s)", bandwidth.ToDebugValue());
 }
 
 }  // namespace test
 }  // namespace net