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gtest断言
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gtest断言有：ASSERT_XXX断言、EXPECT_XXX断言、其他断言。区别是ASSERT断言是失败退出，EXPECT断言是失败继续执行，EXPECT用的比较多。
下面列出断言清单，EXPECT就不再单独列出了，参考ASSERT断言
https://www.cnblogs.com/coderzh/archive/2009/04/06/1430364.html
https://www.cnblogs.com/kelamoyujuzhen/p/10223860.html
ASSERT/EXPECT断言
布尔值检查
Fatal assertion | Nonfatal assertion | Verifies |
ASSERT_TRUE(condition); | EXPECT_TRUE(condition); | condition is true |
ASSERT_FALSE(condition); | EXPECT_FALSE(condition); | condition is false |
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
*STREQ*和*STRNE*同时支持char*和wchar_t*类型的，*STRCASEEQ*和*STRCASENE*却只接收char*
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 |
浮点型检查
Fatal assertion | Nonfatal assertion | Verifies |
ASSERT_FLOAT_EQ(expected, actual); | EXPECT_FLOAT_EQ(expected, actual); | the two float values are almost equal |
ASSERT_DOUBLE_EQ(expected, actual); | EXPECT_DOUBLE_EQ(expected, actual); | the two double values are almost equal |
相对上面的浮点数EQ检查，NEAR检查更有意义
Fatal assertion | Nonfatal assertion | Verifies |
ASSERT_NEAR(val1, val2, abs_error); | EXPECT_NEAR(val1, val2, abs_error); | the difference between val1 and val2 doesn't exceed the given absolute error |
异常检查
Fatal assertion | Nonfatal assertion | Verifies |
ASSERT_THROW(statement, exception_type); | EXPECT_THROW(statement, exception_type); | statement throws an exception of the given type |
ASSERT_ANY_THROW(statement); | EXPECT_ANY_THROW(statement); | statement throws an exception of any type |
ASSERT_NO_THROW(statement); | EXPECT_NO_THROW(statement); | statement doesn't throw any exception |
谓词断言Predicate Assertions
在使用EXPECT_TRUE或ASSERT_TRUE时，有时希望能够输出更加详细的信息，比如检查一个函数的返回值TRUE还是FALSE时，希望能够输出传入的参数是什么，以便失败后好跟踪。因此提供了如下的断言，函数参数数量有限，支持5个及以内参数。
Fatal assertion | Nonfatal assertion | Verifies |
ASSERT_PRED1(pred1, val1); | EXPECT_PRED1(pred1, val1); | pred1(val1) returns true |
ASSERT_PRED2(pred2, val1, val2); | EXPECT_PRED2(pred2, val1, val2); | pred2(val1, val2) returns true |
... | ... | ... |
其他断言
显示返回成功或失败
返回成功或失败断言，单独使用，没有实际的意思，更多是用来和其他断言配合，比如switch(expression)
{
case1:
xxx
default:
FAIL() << "default failed";
}
直接返回成功：SUCCEED();
返回失败：
Fatal assertion | Nonfatal assertion |
FAIL(); | ADD_FAILURE(); |
类型检查
类型检查失败时，直接导致代码编不过
Windows HRESULT assertions
不懂，后面研究一下
