Potential syntax for constructor testing in AggregateSource

Constructortests.cs

[Test]
public void ConstructorSucceeeds()
{
	var id = new ConcertId(Guid.NewGuid());

	new ConstructorScenario()
		.When(() => Concert.New(id))
		.Then(ConcertEvents.Planned(id))
		.Assert();
}

[Test]
public void ConstructorThrows()
{
	new ConstructorScenario()
		.When(() => Concert.New(new ConcertId(Guid.NewGuid()), true))
		.AssertThrows(new ArgumentException("shouldThrow"));
}