src/third_party/WebKit/Source/wtf/SaturatedArithmeticTest.cpp

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  30
  31 #include "config.h"
  32
  33 #include "wtf/SaturatedArithmetic.h"
  34 #include <gtest/gtest.h>
  35 #include <limits.h>
  36
  37 namespace {
  38
  39 TEST(SaturatedArithmeticTest, Addition)
  40 {
  41     EXPECT_EQ(0, saturatedAddition(0, 0));
  42     EXPECT_EQ(1, saturatedAddition(0, 1));
  43     EXPECT_EQ(100, saturatedAddition(0, 100));
  44     EXPECT_EQ(150, saturatedAddition(100, 50));
  45
  46     EXPECT_EQ(-1, saturatedAddition(0, -1));
  47     EXPECT_EQ(0, saturatedAddition(1, -1));
  48     EXPECT_EQ(50, saturatedAddition(100, -50));
  49     EXPECT_EQ(-50, saturatedAddition(50, -100));
  50
  51     EXPECT_EQ(INT_MAX - 1, saturatedAddition(INT_MAX - 1, 0));
  52     EXPECT_EQ(INT_MAX, saturatedAddition(INT_MAX - 1, 1));
  53     EXPECT_EQ(INT_MAX, saturatedAddition(INT_MAX - 1, 2));
  54     EXPECT_EQ(INT_MAX - 1, saturatedAddition(0, INT_MAX - 1));
  55     EXPECT_EQ(INT_MAX, saturatedAddition(1, INT_MAX - 1));
  56     EXPECT_EQ(INT_MAX, saturatedAddition(2, INT_MAX - 1));
  57     EXPECT_EQ(INT_MAX, saturatedAddition(INT_MAX - 1, INT_MAX - 1));
  58     EXPECT_EQ(INT_MAX, saturatedAddition(INT_MAX, INT_MAX));
  59
  60     EXPECT_EQ(INT_MIN, saturatedAddition(INT_MIN, 0));
  61     EXPECT_EQ(INT_MIN + 1, saturatedAddition(INT_MIN + 1, 0));
  62     EXPECT_EQ(INT_MIN + 2, saturatedAddition(INT_MIN + 1, 1));
  63     EXPECT_EQ(INT_MIN + 3, saturatedAddition(INT_MIN + 1, 2));
  64     EXPECT_EQ(INT_MIN, saturatedAddition(INT_MIN + 1, -1));
  65     EXPECT_EQ(INT_MIN, saturatedAddition(INT_MIN + 1, -2));
  66     EXPECT_EQ(INT_MIN + 1, saturatedAddition(0, INT_MIN + 1));
  67     EXPECT_EQ(INT_MIN, saturatedAddition(-1, INT_MIN + 1));
  68     EXPECT_EQ(INT_MIN, saturatedAddition(-2, INT_MIN + 1));
  69
  70     EXPECT_EQ(INT_MAX / 2 + 10000, saturatedAddition(INT_MAX / 2, 10000));
  71     EXPECT_EQ(INT_MAX, saturatedAddition(INT_MAX / 2 + 1, INT_MAX / 2 + 1));
  72     EXPECT_EQ(-1, saturatedAddition(INT_MIN, INT_MAX));
  73 }
  74
  75 TEST(SaturatedArithmeticTest, Subtraction)
  76 {
  77     EXPECT_EQ(0, saturatedSubtraction(0, 0));
  78     EXPECT_EQ(-1, saturatedSubtraction(0, 1));
  79     EXPECT_EQ(-100, saturatedSubtraction(0, 100));
  80     EXPECT_EQ(50, saturatedSubtraction(100, 50));
  81
  82     EXPECT_EQ(1, saturatedSubtraction(0, -1));
  83     EXPECT_EQ(2, saturatedSubtraction(1, -1));
  84     EXPECT_EQ(150, saturatedSubtraction(100, -50));
  85     EXPECT_EQ(150, saturatedSubtraction(50, -100));
  86
  87     EXPECT_EQ(INT_MAX, saturatedSubtraction(INT_MAX, 0));
  88     EXPECT_EQ(INT_MAX - 1, saturatedSubtraction(INT_MAX, 1));
  89     EXPECT_EQ(INT_MAX - 1, saturatedSubtraction(INT_MAX - 1, 0));
  90     EXPECT_EQ(INT_MAX, saturatedSubtraction(INT_MAX - 1, -1));
  91     EXPECT_EQ(INT_MAX, saturatedSubtraction(INT_MAX - 1, -2));
  92     EXPECT_EQ(-INT_MAX + 1, saturatedSubtraction(0, INT_MAX - 1));
  93     EXPECT_EQ(-INT_MAX, saturatedSubtraction(-1, INT_MAX - 1));
  94     EXPECT_EQ(-INT_MAX - 1, saturatedSubtraction(-2, INT_MAX - 1));
  95     EXPECT_EQ(-INT_MAX - 1, saturatedSubtraction(-3, INT_MAX - 1));
  96
  97     EXPECT_EQ(INT_MIN, saturatedSubtraction(INT_MIN, 0));
  98     EXPECT_EQ(INT_MIN + 1, saturatedSubtraction(INT_MIN + 1, 0));
  99     EXPECT_EQ(INT_MIN, saturatedSubtraction(INT_MIN + 1, 1));
 100     EXPECT_EQ(INT_MIN, saturatedSubtraction(INT_MIN + 1, 2));
 101
 102     EXPECT_EQ(0, saturatedSubtraction(INT_MIN, INT_MIN));
 103     EXPECT_EQ(0, saturatedSubtraction(INT_MAX, INT_MAX));
 104     EXPECT_EQ(INT_MAX, saturatedSubtraction(INT_MAX, INT_MIN));
 105 }
 106
 107 } // namespace