Writing Tests for Interface Classes

[Enki]

Hi,

is there way to write tests for a bunch of classes by using their common interface class instead?

I want to write a test only once using the interface defined by the root parent but I also want this particular test to run for every instance of the derived classes (for example by providing the instances through  factorys).

How could I accomplish this in an elegant way?

[Enki]

Hi there! I found a solution myself, but it is not a particularly prety one. Here is an example (suppose IVehicle is the interface class to Car and Truck).

#include <cppunit/config/SourcePrefix.h>
#include <cppunit/extensions/HelperMacros.h>
#include <ivehicle.h>
#include <car.h>
#include <truck.h>
template <class T>
class IVehicleTest : public CPPUNIT_NS::TestFixture
{
    CPPUNIT_TEST_SUITE(IVehicleTest<T>);
    CPPUNIT_TEST(someTest);
    CPPUNIT_TEST_SUITE_END();
private:
    IVehicle *pVehicle;
public:
    void setUp()
    {
        pVehicle = new T();
    }
    void tearDown()
    {
        delete pVehicle;
    }
protected:
    void someTest()
    {
        CPPUNIT_ASSERT( pVehicle->wrumwrum() );
    }
};
CPPUNIT_TEST_SUITE_REGISTRATION(IVehicleTest<Car>);
CPPUNIT_TEST_SUITE_REGISTRATION(IVehicleTest<Truck>);

[Enki]

If you have got any better Ideas please tell me! Since the test output of the above approach does not work correctly.