ILSpy/ILSpy.Tests/AppEnv/AppCompositionTests.cs

// Copyright (c) 2026 AlphaSierraPapa for the SharpDevelop Team
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using Avalonia.Headless.NUnit;

using AwesomeAssertions;

using ICSharpCode.ILSpy.AppEnv;

using NUnit.Framework;

namespace ICSharpCode.ILSpy.Tests.AppEnv;

// AppComposition.Initialize() builds the MEF host out of ILSpyX + ILSpy + any *.Plugin.dll
// siblings. TestApp.OnFrameworkInitializationCompleted invokes it during harness startup; if
// composition fails (missing export, duplicate Shared, broken import), AppComposition.Current
// throws InvalidOperationException, and every downstream test that does GetExport<T> hits a
// confusing failure further down the stack. This test catches the regression at the source.
[TestFixture]
public class AppCompositionTests
{
	[AvaloniaTest]
	public void AppComposition_Current_is_non_null_after_harness_init()
	{
		AppComposition.Current.Should().NotBeNull();
	}
}