[Boost-users] [BOOST]BOOST_AUTO_TEST_CASE_TEMPLATE vs BOOST_AUTO_TEST_CASE

Subject: [Boost-users] [BOOST]BOOST_AUTO_TEST_CASE_TEMPLATE vs BOOST_AUTO_TEST_CASE
From: Hemanth Choudary M V (RBEI/ETA1) (HemanthChoudary.MV_at_[hidden])
Date: 2013-09-18 01:35:39

Hi,

Scenario1:
Both files are present in the same Project BoostUnitTest.
fileA:
typedef boost::mpl::list<long long,unsigned char> test_types;

BOOST_AUTO_TEST_SUITE(MySuite)
BOOST_AUTO_TEST_CASE_TEMPLATE( my_test, T, test_types )
{
    BOOST_CHECK_EQUAL( sizeof(T), (unsigned)4 );
}
BOOST_AUTO_TEST_SUITE_END()

fileB:
typedef boost::mpl::list<long long,unsigned char> test_types;

BOOST_AUTO_TEST_SUITE(MySuite)
BOOST_AUTO_TEST_CASE_TEMPLATE( my_test, T, test_types )
{
    BOOST_CHECK_EQUAL( sizeof(T), (unsigned)4 );
}
BOOST_AUTO_TEST_SUITE_END()

As shown above, MySuite is extended across 2 files fileA and fileB. The BOOST_AUTO_TEST_CASE_TEMPLATE name is same across the both the files and and the suite name is also same across both the files..

Boost is able to differentiate between the 2 test cases and the test cases are executed.

Scenario2:
fileA:
BOOST_AUTO_TEST_SUITE(MySuite)
BOOST_AUTO_TEST_CASE( my_test)
{
    BOOST_CHECK_EQUAL(1,1);
}
BOOST_AUTO_TEST_SUITE_END()

fileB:

BOOST_AUTO_TEST_SUITE(MySuite)
BOOST_AUTO_TEST_CASE_TEMPLATE( my_test )
{
    BOOST_CHECK_EQUAL( 1,1 );
}
BOOST_AUTO_TEST_SUITE_END()

In the scenario2, I get a compile time error (Error 1 error LNK2005: "public: void __thiscall mySuite::insuite2::test_method(void)" (?test_method_at_insuite2@mySuite@@QAEXXZ) already defined in BoostUnitTest.obj) which basically suggests that one or more multiply defined symbols are found.

Why is the behaviour different in these 2 scenarios? How is Boost able to differenciate between the 2 test cases in Scenario1?

Mit freundlichen Grüßen / Best Regards,
Hemanth Choudary MV
RBEI/ETA1