ILSpy/ILSpy.Tests/Editor/LineHighlightAdornerTests.cs

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using System.Linq;

using AvaloniaEdit;

using Avalonia.Headless.NUnit;

using AwesomeAssertions;

using ICSharpCode.ILSpy.TextView;

using NUnit.Framework;

namespace ICSharpCode.ILSpy.Tests;

// The line-highlight flash that plays alongside the gutter-icon pulse on a bookmark navigation.
// The animation curve / timing are eyeballed; this pins the register-then-unregister lifecycle.
[TestFixture]
public class LineHighlightAdornerTests
{
	[AvaloniaTest]
	public void DisplayLineHighlight_registers_and_Dismiss_unregisters()
	{
		var editor = new TextEditor { Document = new AvaloniaEdit.Document.TextDocument("line1\nline2\nline3") };
		var renderers = editor.TextArea.TextView.BackgroundRenderers;
		renderers.Should().NotContain(r => r is LineHighlightAdorner);

		LineHighlightAdorner.DisplayLineHighlight(editor.TextArea, 2);
		renderers.Should().Contain(r => r is LineHighlightAdorner, "DisplayLineHighlight adds the adorner");

		renderers.OfType<LineHighlightAdorner>().Single().Dismiss();
		renderers.Should().NotContain(r => r is LineHighlightAdorner, "Dismiss unregisters the adorner");
	}
}