C程序：使用 googletest 测试框架

googletest C/C++ 测试框架非常好用，介绍及下载请看  http://code.google.com/p/googletest/
//============================================================================
// 使用 googletest 测试框架
//============================================================================

// Returns n! (the factorial of n). For negative n, n! is defined to be 1.
int Factorial(int n)
{
int result = 1;
for (int i = 1; i <= n; i++)
{
result *= i;
}

return result;
}

#include "src/gtest-all.cc"

// Tests Factorial().
// Tests factorial of negative numbers.
TEST(FactorialTest, Negative)
{
EXPECT_EQ(1, Factorial(-5));
EXPECT_EQ(1, Factorial(-1));
EXPECT_TRUE(Factorial(-10)> 0);
}

// Tests factorial of 0.
TEST(FactorialTest, Zero)
{
EXPECT_EQ(1, Factorial(0));
}

// Tests factorial of positive numbers.
TEST(FactorialTest, Positive)
{
EXPECT_EQ(1, Factorial(1));
EXPECT_EQ(2, Factorial(2));
EXPECT_EQ(6, Factorial(3));
EXPECT_EQ(40320, Factorial(8));
}

#include "src/gtest_main.cc"