c++ - boost 测试 : catch user defined exceptions

Question

如果我的代码中有用户定义的异常，我将无法进行 Boost 测试 将它们视为失败。

例如，

BOOST_AUTO_TEST_CASE_EXPECTED_FAILURES(MyTest,1)
BOOST_AUTO_TEST_CASE(MyTest)
{
// code which throws user defined exception, not derived from std::exception.

}

我收到一条通用消息:

Caught exception: ....
unknown location(0):....

它不会将此错误识别为失败，因为它不是 std::exception。 所以它不遵守 expected_failures 条款。

如何强制这段代码始终抛出异常？ 这似乎是一个有用的东西。以防将来代码更改导致代码 通过并且没有抛出异常，我想知道这一点。

Answer 1

EXPECTED_FAILURES 指的是针对BOOST_REQUIRE 或其他断言的失败。文档明确指出:

The feature is not intended to be used to check for expected functionality failures. To check that a particular input is causing an exception to be thrown use BOOST_CHECK_THROW family of testing tools.

重点是我的。

当断言失败但您想暂时忽略它时，预期的失败旨在用作测试期间的临时解决方法。

摘自他们的 expected failures spec :

BOOST_AUTO_TEST_CASE_EXPECTED_FAILURES( my_test1, 1 )

BOOST_AUTO_TEST_CASE( my_test1 )
{
    BOOST_CHECK( 2 == 1 );
}

将导致输出

test.cpp(10): error in "my_test1": check 2 == 1 failed

Test suite "example" passed with:
  1 assertions out of 1 failed
  1 failures expected
  1 test case out of 1 passed

As you can see, in spite of assertions failing, the test case still passed due to the use of expected failures.

---

So if you need to verify that something is throwing an exception, you use code like the following:

BOOST_AUTO_TEST_CASE(invalid_operation_should_throw_custom_exception)
{
    MyObj obj;
    BOOST_REQUIRE_THROW(obj.invalid_operation(), CustomException);
}