public void Union_Empty()
{
var element = ReFactory.NewUnion(Array.Empty <ReElement>());
Assert.That(element, Is.Not.Null);
Assert.That(element, Is.TypeOf(typeof(ReEmptyLanguage)));
}
public void Union_Single()
{
var child = ReUtils.NewDummy('1');
var element = ReFactory.NewUnion(ImmutableArray.Create(child));
Assert.That(element, Is.SameAs(child));
}
public void Union_Collapse()
{
var child1 = ReUtils.NewDummy('1');
var child2 = ReUtils.NewDummy('2');
var child3 = ReUtils.NewDummy('3');
var child4 = ReUtils.NewDummy('4');
var subUnion = new ReUnion(ImmutableArray.Create(child2, child3));
var element = ReFactory.NewUnion(new ReElement[] { child1, subUnion, ReEmptyLanguage.Instance, child4 });
Assert.That(element, Is.Not.Null);
Assert.That(element, Is.TypeOf(typeof(ReUnion)));
var union = (ReUnion)element;
Assert.That(union.Elements, Is.EquivalentTo(new ReElement[] { child1, child2, child3, child4 }));
}