ILSpy/ILSpy.Tests/AppInitializationTests.cs

// Copyright (c) 2026 AlphaSierraPapa for the SharpDevelop Team
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using Avalonia;
using Avalonia.Headless.NUnit;

using AwesomeAssertions;

using ICSharpCode.ILSpy;

using NUnit.Framework;

namespace ICSharpCode.ILSpy.Tests;

// Sanity check that TestApp.base.Initialize() populates DataTemplates and Styles from
// ILSpy/App.axaml. If this regresses, every UI-headless test that follows runs against an
// unconfigured Application surface (no ViewLocator, no theme), failing in confusing ways.
[TestFixture]
public class AppInitializationTests
{
	[AvaloniaTest]
	public void TestApp_pulls_DataTemplates_from_App_axaml()
	{
		var app = Application.Current!;
		app.DataTemplates.Should().Contain(t => t is ViewLocator,
			"App.axaml registers ViewLocator; base.Initialize() should propagate it onto TestApp.");
	}

	[AvaloniaTest]
	public void TestApp_pulls_Styles_from_App_axaml()
	{
		var app = Application.Current!;
		app.Styles.Should().NotBeEmpty(
			"App.axaml registers a theme via Application.Styles; TestApp should inherit it.");
	}
}