public async Task OneWay_Binding_Should_Be_Set_Up() { var source = new { A = 1, B = 2, C = 3 }; var binding = new MultiBinding { Converter = new ConcatConverter(), Bindings = new[] { new Binding { Path = "A" }, new Binding { Path = "B" }, new Binding { Path = "C" }, } }; var target = new Mock <IAvaloniaObject>().As <IControl>(); target.Setup(x => x.GetValue(Control.DataContextProperty)).Returns(source); var observable = binding.Initiate(target.Object, null).Observable; var result = await observable.Take(1); Assert.Equal("1,2,3", result); }