public void EntitiyGraphShapeUnionTest()
{
var shape1 = new EntityGraphShape()
.Edge <A, D>(A => A.DSet)
.Edge <A, B>(A => A.B);
var shape2 = new EntityGraphShape()
.Edge <A, D>(A => A.DSet)
.Edge <A, B>(A => A.B)
.Edge <C, D>(C => C.D);
var shape3 = shape1.Union(shape2);
Assert.IsTrue(shape1.All(edge => shape3.Contains(edge)));
Assert.IsTrue(shape2.All(edge => shape2.Contains(edge)));
Assert.IsFalse(shape3.Any(edge => shape1.Contains(edge) == false && shape2.Contains(edge) == false));
Assert.IsTrue(shape3.Count() == 3);
}
