Method testVoid

test/cpp/src/TestServer.cpp:414–417

  ~TestHandlerAsync() override = default;

  void testVoid(std::function<void()> cob) override {
    _delegate->testVoid();
    cob();
  }

  void testString(std::function<void(std::string const& _return)> cob,
                          const std::string& thing) override {