public void Test_Visitor0()
{
Visitor <string> visitor = new DefaultVisitor();
IVehicle vehicle1 = new Car();
string text1 = vehicle1.Accept(visitor);
Assert.Equal("car", text1);
IVehicle vehicle2 = new Moto();
string text2 = vehicle2.Accept(visitor);
Assert.Equal("moto", text2);
}
