Method invoke

Bcore/src/main/cpp/Dobby/tests/catch.hpp:2741–2749

  }

  virtual void invoke() const {
    id obj = [[m_cls alloc] init];

    performOptionalSelector(obj, @selector(setUp));
    performOptionalSelector(obj, m_sel);
    performOptionalSelector(obj, @selector(tearDown));

    arcSafeRelease(obj);
  }

private:
  virtual ~OcMethod() {