using Avalonia.Controls; using Xunit; namespace Avalonia.Base.UnitTests { public class AttachedPropertyTests { [Fact] public void IsAttached_Returns_True() { var property = new AttachedProperty( "Foo", typeof(Class1), typeof(Control), new StyledPropertyMetadata()); Assert.True(property.IsAttached); } private class Class1 : AvaloniaObject { } } }