Don't let rounding prematurely influence document size when printing

printing/units_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 "printing/units.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/gtest/include/gtest/gtest-spi.h"
 
 namespace printing {
 
@@ skipping 13 matching lines @@
   EXPECT_EQ(10, ConvertUnit(1001, 1000, 10));
   EXPECT_EQ(10, ConvertUnit(1049, 1000, 10));
   EXPECT_EQ(11, ConvertUnit(1050, 1000, 10));
   EXPECT_EQ(-10, ConvertUnit(-999, 1000, 10));
   EXPECT_EQ(-10, ConvertUnit(-950, 1000, 10));
   EXPECT_EQ(-9, ConvertUnit(-949, 1000, 10));
   EXPECT_EQ(-10, ConvertUnit(-1001, 1000, 10));
   EXPECT_EQ(-10, ConvertUnit(-1049, 1000, 10));
   EXPECT_EQ(-11, ConvertUnit(-1050, 1000, 10));
 
+  EXPECT_EQ(99920, ConvertUnit(999.2, 10, 1000));
+  EXPECT_EQ(-94920, ConvertUnit(-949.2, 10, 1000));
+  EXPECT_EQ(99970, ConvertUnit(999.7, 10, 1000));
+  EXPECT_EQ(-94970, ConvertUnit(-949.7, 10, 1000));
+
+  EXPECT_EQ(3996, ConvertUnit(999.1, 75, 300));
+  EXPECT_EQ(3997, ConvertUnit(999.3, 75, 300));
+  EXPECT_EQ(3998, ConvertUnit(999.5, 75, 300));
+  EXPECT_EQ(3999, ConvertUnit(999.7, 75, 300));
+  EXPECT_EQ(4000, ConvertUnit(999.9, 75, 300));
+
   EXPECT_EQ(0, ConvertUnit(2, 1000000000, 1));
   EXPECT_EQ(2000000000, ConvertUnit(2, 1, 1000000000));
-  EXPECT_EQ(4000000000U,
-            static_cast<unsigned int>(ConvertUnit(2, 1, 2000000000)));
 
   EXPECT_EQ(100, ConvertUnitDouble(100, 100, 100));
   EXPECT_EQ(-100, ConvertUnitDouble(-100, 100, 100));
   EXPECT_EQ(0, ConvertUnitDouble(0, 100, 100));
   EXPECT_DOUBLE_EQ(0.000002, ConvertUnitDouble(2, 1000, 0.001));
   EXPECT_EQ(2000000, ConvertUnitDouble(2, 0.001, 1000));
 
   EXPECT_EQ(kHundrethsMMPerInch, ConvertMilliInchToHundredThousanthMeter(1000));
   EXPECT_EQ(-kHundrethsMMPerInch,
             ConvertMilliInchToHundredThousanthMeter(-1000));
   EXPECT_EQ(0, ConvertMilliInchToHundredThousanthMeter(0));
   EXPECT_EQ(1000, ConvertHundredThousanthMeterToMilliInch(kHundrethsMMPerInch));
   EXPECT_EQ(-1000,
             ConvertHundredThousanthMeterToMilliInch(-kHundrethsMMPerInch));
   EXPECT_EQ(0, ConvertHundredThousanthMeterToMilliInch(0));
 
   EXPECT_EQ(8.25, ConvertPixelsToPointDouble(11.0));
   // Round down.
   EXPECT_EQ(8, ConvertPixelsToPoint(11));
   EXPECT_EQ(7.5, ConvertPixelsToPointDouble(10.0));
   // Round up.
   EXPECT_EQ(8, ConvertPixelsToPoint(10));
   EXPECT_EQ(0, ConvertPixelsToPoint(0));
 }
 
 }  // namespace printing