CPPUNIT: do we really need one function per test?

Question

Consider this CPPUNIT test class meant to do the same test (doTest) but with different arguments:

class MyTest : public CPPUNIT_NS::TestFixture
{
  CPPUNIT_TEST_SUITE( MyTest );
  CPPUNIT_TEST( test1 );
  CPPUNIT_TEST( test2 );
  CPPUNIT_TEST( test3 );
  CPPUNIT_TEST_SUITE_END();

public:
  MyTest();

  void test1() { doTest(1); }
  void test2() { doTest(2); }
  void test3() { doTest(3); }

  void doTest( int param );
};
CPPUNIT_TEST_SUITE_REGISTRATION(MyTest);

Is there no way to change that to avoid having to declare test1, test2 and test3, with something like:

class MyTest : public CPPUNIT_NS::TestFixture
{
  CPPUNIT_TEST_SUITE( MyTest );
  CPPUNIT_TEST_PARAM( doTest, 1 ); // CPPUNIT_TEST_PARAM does not exits, it's just to illustrate my need
  CPPUNIT_TEST_PARAM( doTest, 2 ); // CPPUNIT_TEST_PARAM does not exits, it's just to illustrate my need
  CPPUNIT_TEST_PARAM( doTest, 3 ); // CPPUNIT_TEST_PARAM does not exits, it's just to illustrate my need
  CPPUNIT_TEST_SUITE_END();

public:
  MyTest();

  void doTest( int param );
};
CPPUNIT_TEST_SUITE_REGISTRATION(MyTest);

Note that CPPUNIT_TEST is a macro:

#define CPPUNIT_TEST( testMethod )                        \
    CPPUNIT_TEST_SUITE_ADD_TEST(                           \
        ( new CPPUNIT_NS::TestCaller<TestFixtureType>(    \
                  context.getTestNameFor( #testMethod),   \
                  &TestFixtureType::testMethod,           \
                  context.makeFixture() ) ) )

Edit:

Tried this:

CPPUNIT_TEST_SUITE( MyTest );
CPPUNIT_TEST( funcT<1> );
CPPUNIT_TEST_SUITE_END();

template<int i> void funcT() { doTest(i); }

It works fine, but fails if I use char* types:

CPPUNIT_TEST_SUITE( MyTest );
CPPUNIT_TEST( funcT<"foo"> );
CPPUNIT_TEST_SUITE_END();

template<char* s> void funcT() { std::cout << s << std::endl; doTest(1); }

It errors:

error C2664: 'CppUnit::TestCaller<test_cppunit_regulation_regul_dt_100::TestFixtureType>::TestCaller(const CppUnit::TestCaller<test_cppunit_regulation_regul_dt_100::TestFixtureType> &)': cannot convert argument 2 from 'void (__cdecl *)(void)' to 'void (__cdecl test_cppunit_regulation_regul_dt_100::* )(void)'

Or more parameters:

CPPUNIT_TEST_SUITE( MyTest );
CPPUNIT_TEST( funcT<1,2> );
CPPUNIT_TEST_SUITE_END();

template<int i, int j> void funcT() { doTest(i+j); }

It errors:

1>b:\dev\vobs_diabeloop\private\tst\regulation\cppunit\regul_dt_100\test.cpp(14): warning C4002: too many actual parameters for macro 'CPPUNIT_TEST'
1>b:\dev\vobs_diabeloop\private\tst\regulation\cppunit\regul_dt_100\test.cpp(14): error C2059: syntax error: ')'

Finally tried to add parenthesis ( CPPUNIT_TEST( (funcT<1,2>) ); ), it errors:

1>b:\dev\vobs_diabeloop\private\tst\regulation\cppunit\regul_dt_100\test.cpp(14): error C2589: '(': illegal token on right side of '::'
1>b:\dev\vobs_diabeloop\private\tst\regulation\cppunit\regul_dt_100\test.cpp(14): error C2059: syntax error: '::'
1>b:\dev\vobs_diabeloop\private\tst\regulation\cppunit\regul_dt_100\test.cpp(14): error C2660: 'CppUnit::TestSuiteBuilderContextBase::addTest': function does not take 2 arguments
1>b:\dev\vobs_diabeloop\private\tst\regulation\cppunit\regul_dt_100\test.cpp(14): error C2143: syntax error: missing ';' before ')'
1>b:\dev\vobs_diabeloop\private\tst\regulation\cppunit\regul_dt_100\test.cpp(14): error C2059: syntax error: ')'

Answer 1

Found a solution by creating several test classes (instead of one single with several sub-tests).

Simple case where there's only one int parameter:

class BaseTest : public CPPUNIT_NS::TestFixture
{
public:
    BaseTest() {}

    void doTest( int param ) {}
};

template < int i >
class MyTest : public BaseTest
{
    CPPUNIT_TEST_SUITE(MyTest<i>);
    CPPUNIT_TEST( doTest );
    CPPUNIT_TEST_SUITE_END();

    void doTest()
    {
        BaseTest::doTest( i );
    };
};

#define REGISTER_TEST_WITH_PARAMS( name, a ) \
        CPPUNIT_TEST_SUITE_REGISTRATION( MyTest<a> );

REGISTER_TEST_WITH_PARAMS( test1, 1 );
REGISTER_TEST_WITH_PARAMS( test2, 2 );

If more parameters are needed, just create a class to encapsulate them:

class BaseTest : public CPPUNIT_NS::TestFixture
{
public:
    BaseTest() {}

    void doTest( int param1, const std::string& param2 ) {}
};

class ParamClass
{
public:
    ParamClass( int param1, const std::string& param2 ) :
        param1( param1 ),
        param2( param2 )
    {

    }

    int param1;
    std::string param2;
};

template < ParamClass & T >
class CURRENT_MODULE : public BaseTest
{
    CPPUNIT_TEST_SUITE(MyTest<T>);
    CPPUNIT_TEST( doTest );
    CPPUNIT_TEST_SUITE_END();

    void doTest()
    {
        BaseTest::doTest( T.param1, T.param2 );
    };
};

#define REGISTER_TEST_WITH_PARAMS( name, a, b ) \
        ParamClass name( a, b ); \
        CPPUNIT_TEST_SUITE_REGISTRATION( MyTest<name> );

REGISTER_TEST_WITH_PARAMS( test1, 1, "test1" );
REGISTER_TEST_WITH_PARAMS( test2, 2, "test2" );