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谷歌的测试框架

EXPECT和ASSERT系列的区别：
1. EXPECT_* 失败时，案例继续往下执行
2. ASSERT_* 失败时，直接在当前函数中返回，当前函数中ASSERT_* 后面的语句将不会执行

可以使用操作符 << 将一些自定义的信息输出，例如：
EXPECT_EQ(x, y) << "error" << 代码中的变量

数值型数据检查：

Fatal assertion	Nonfatal assertion	Verifies
ASSERT_EQ(expected, actual);	EXPECT_EQ(expected, actual);	expected == actual
ASSERT_NE(val1, val2);	EXPECT_NE(val1, val2);	val1 != val2
ASSERT_LT(val1, val2);	EXPECT_LT(val1, val2);	val1 < val2
ASSERT_LE(val1, val2);	EXPECT_LE(val1, val2);	val1 <= val2
ASSERT_GT(val1, val2);	EXPECT_GT(val1, val2);	val1 > val2
ASSERT_GE(val1, val2);	EXPECT_GE(val1, val2);	val1 >= val2

字符串检查：

Fatal assertion	Nonfatal assertion	Verifies
ASSERT_STREQ(expected_str, actual_str);	EXPECT_STREQ(expected_str, actual_str);	the two C strings have the same content
ASSERT_STRNE(str1, str2);	EXPECT_STRNE(str1, str2);	the two C strings have different content
ASSERT_STRCASEEQ(expected_str, actual_str);	EXPECT_STRCASEEQ(expected_str, actual_str);	the two C strings have the same content, ignoring case
ASSERT_STRCASENE(str1, str2);	EXPECT_STRCASENE(str1, str2);	the two C strings have different content, ignoring case

显示返回成功或者失败: 直接返回成功：SUCCESS()

Fatal assertion	Nonfatal assertion
FAIL();	ADD_FAILURE();