Parameterizing a test using CppUnit

Question

My organization is using CppUnit and I am trying to run the same test using different parameters. Running a loop inside the test is not a good option as any failure will abo

Answer 1

The following class/helper macro pair works for my current use-cases. In your TestFixture subclass, just define a method which accepts one parameter and then add the test with PARAMETERISED_TEST(method_name, argument_type, argument_value).

#include <cppunit/extensions/HelperMacros.h>
#include <cppunit/ui/text/TestRunner.h>

template <class FixtureT, class ArgT>
class ParameterisedTest : public CppUnit::TestCase {
public:
  typedef void (FixtureT::*TestMethod)(ArgT);
  ParameterisedTest(std::string name, FixtureT* fix, TestMethod f, ArgT a) :
    CppUnit::TestCase(name), fixture(fix), func(f), arg(a) {
  }
  ParameterisedTest(const ParameterisedTest* other) = delete;
  ParameterisedTest& operator=(const ParameterisedTest& other) = delete;

  void runTest() {
    (fixture->*func)(arg);
  }
  void setUp() { 
    fixture->setUp(); 
  }
  void tearDown() { 
    fixture->tearDown(); 
  }
private:
  FixtureT* fixture;
  TestMethod func;
  ArgT arg;
};

#define PARAMETERISED_TEST(Method, ParamT, Param)           \
  CPPUNIT_TEST_SUITE_ADD_TEST((new ParameterisedTest<TestFixtureType, ParamT>(context.getTestNameFor(#Method #Param), \
                                          context.makeFixture(), \
                                          &TestFixtureType::Method, \
                                              Param)))

class FooTests : public CppUnit::TestFixture {
  CPPUNIT_TEST_SUITE(FooTests);
  PARAMETERISED_TEST(ParamTest, int, 0);
  PARAMETERISED_TEST(ParamTest, int, 1);
  PARAMETERISED_TEST(ParamTest, int, 2);
  CPPUNIT_TEST_SUITE_END();
public:
  void ParamTest(int i) {
    CPPUNIT_ASSERT(i > 0);
  }
};
CPPUNIT_TEST_SUITE_REGISTRATION(FooTests);

int main( int argc, char **argv)
{
  CppUnit::TextUi::TestRunner runner;
  CppUnit::TestFactoryRegistry &registry = CppUnit::TestFactoryRegistry::getRegistry();
  runner.addTest( registry.makeTest() );
  bool wasSuccessful = runner.run( "", false );
  return wasSuccessful;
}