//
// Listing 6: Anwendung von CppUnit
//

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

int global_error = 0; // Störfaktor für Tests

// Klasse,die getestet werden soll
class Calculator
{
  public:

    Calculator (int in_base)
      : base(in_base)
    {}

    // Wert addieren
    int add(int num)
    {
      return base + num + global_error;
    }

    // Wert subtrahieren
    int sub(int num)
    {
      return base - num - global_error;
    }

 private:

   int base;
};


// Helfer-Klasse mit den Unit-Tests
class Calculator_test : public CppUnit::TestFixture
{
 public:

   CPPUNIT_TEST_SUITE( Calculator_test );
     CPPUNIT_TEST(test_add);
     CPPUNIT_TEST(test_sub);
   CPPUNIT_TEST_SUITE_END();

 public:

   void test_add();
   void test_sub();
};

// Tests automatisch eintragen
CPPUNIT_TEST_SUITE_REGISTRATION(Calculator_test);


// Tests der Additions-Methode
void Calculator_test::test_add()
{
  Calculator calc(100);
  CPPUNIT_ASSERT_EQUAL(123, calc.add(23));
}


// Tests der Subtractions-Methode
void Calculator_test::test_sub()
{
  Calculator calc(100);
  CPPUNIT_ASSERT_EQUAL(78, calc.sub(22));
}


int main(int argc, char **argv)
{
  if (argc != 1)
    global_error = argc;  // Tests stören

  // Tests erstellen und ablaufen lassen
  CppUnit::TextUi::TestRunner runner;
  CppUnit::TestFactory &registry = CppUnit::TestFactoryRegistry::getRegistry();
  runner.addTest(registry.makeTest());
  return runner.run() ? 0 : 1;
}