Avalonia/Tests/Perspex.Styling.UnitTests/SelectorTests_Multiple.cs

// -----------------------------------------------------------------------
// <copyright file="SelectorTests.cs" company="Steven Kirk">
// Copyright 2014 MIT Licence. See licence.md for more information.
// </copyright>
// -----------------------------------------------------------------------

namespace Perspex.Styling.UnitTests
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using Perspex.Controls;
    using Perspex.Styling;
    using Xunit;

    public class SelectorTests_Multiple
    {
        [Fact]
        public void Template_Child_Of_Control_With_Two_Classes()
        {
            var template = new ControlTemplate(parent =>
            {
                return new Border
                {
                    Name = "border",
                };
            });

            var control = new Button
            {
                Template = template,
            };

            control.ApplyTemplate();

            var selector = new Selector()
                .OfType<Button>()
                .Class("foo")
                .Class("bar")
                .Template()
                .Name("border");

            var border = (Border)((IVisual)control).VisualChildren.Single();
            var values = new List<bool>();
            var activator = selector.Match(border).ObservableResult;

            activator.Subscribe(x => values.Add(x));

            Assert.Equal(new[] { false }, values);
            control.Classes.Add("foo", "bar");
            Assert.Equal(new[] { false, true }, values);
            control.Classes.Remove("foo");
            Assert.Equal(new[] { false, true, false }, values);
        }
    }
}