expect_fatal_failure 与普通断言之间的区别

Question

首先，我很抱歉我的英语不好。

在 Google 测试的 github 中，它以这种方式解释 expect_fatal_failure 断言：

EXPECT_FATAL_FAILURE(statement, substring); to assert that statement generates a fatal (e.g. ASSERT_*) failure whose message contains the given substring

但是当我运行我的 expect_fatal_failure 项目时，我找不到使用 EXPECT_NONFATAL_FAILURE(statement, substring) 执行语句和只执行语句

之间的区别]

这是我的代码，

#include "gtest/gtest.h"
#include "gtest/gtest-spi.h"

void failTwice()
{
   EXPECT_TRUE(false) << "fail first time";
   ASSERT_TRUE(false) << "fail second time";
}

TEST(FailureTest, FirstTest)
{
   EXPECT_NONFATAL_FAILURE(failTwice(), "time");
   failTwice();
}

TEST(FailureTest, SecondTest)
{
   EXPECT_NONFATAL_FAILURE(failTwice(), "second");
   failTwice();
}

int main(int argc, char* argv[])
{
    testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
}

结果在图片中。

我这样做有什么问题吗？

或者它们之间没有任何区别？

Answer 1

输出基本上是在告诉您发生了什么：EXPECT_NONFATAL_FAILURE 语句告诉 Google 测试预计在调用 FailTwice 时会发生一次失败，但它会产生两次。注释该函数的第二行并删除对 FailTwice 的额外调用，两个测试都会通过，例如

void failNonFatallyOnFalse(bool param)
{
   EXPECT_TRUE(param) << "fail non-fatally";
}

void failFatallyOnFalse(bool param)
{
   ASSERT_TRUE(param) << "fail fatally";
}

TEST(FailureTest, TestFailNonFatally)
{
   EXPECT_NONFATAL_FAILURE(failNonFatallyOnFalse(false), "fail non-fatally");
}

TEST(FailureTest, TestFailFatally)
{
   EXPECT_FATAL_FAILURE(failFatallyOnFalse(false), "fail fatally");
}

你可以把它们想象成转败为成功，转成功为失败。

乍一看这似乎不是很有用，但是文档explains what these macros are for: they are useful if you are building your own assertions, for example using predicate formatters。您使用不同的参数在 EXPECT_NONFATAL_FAILURE 或 EXPECT_FATAL_FAILURE 下编写您的断言和运行并验证它是否产生预期输出的失败。如果你只是使用 Google Test 编写常规测试，则不需要这两个断言。

Answer 2

这是我们想出的解决方案。 I would mark as duplicate to point to the other question，但我缺乏声望。:

//adapted from EXPECT_FATAL_FAILURE
do {
  //capture all expect failures in test result array
  ::testing::TestPartResultArray gtest_failures;
  //run method in its own scope
  ::testing::ScopedFakeTestPartResultReporter gtest_reporter(
    ::testing::ScopedFakeTestPartResultReporter::
    INTERCEPT_ONLY_CURRENT_THREAD, &gtest_failures);
  //run your method
  failTwice();
  //only check on number, this will include fatal and nonfatal, but if you just care about number then this is sufficient
  ASSERT_EQ(gtest_failures.size(), 2) << "Comparison did not fail FATAL/NONFATAL twice";
} while (::testing::internal::AlwaysFalse());

expect_fatal_failure 与普通断言之间的区别

Difference between expect_fatal_failure & plain assertion

c++

googletest