public void Test4()
{
Concert concert = new Concert("Test", "Test", "Test", 180);
var except = Assert.Throws <ArgumentOutOfRangeException>(() => concert.updatePrice(100));
Assert.That(except.ParamName, Is.EqualTo("Your price 100 is smaller than current price 180"));
}
public void Test3()
{
Concert concert = new Concert("Test", "Test", "Test", 180);
Assert.IsTrue(concert.Price == 180);
concert.updatePrice(190);
Assert.IsTrue(concert.Price == 190);
}