Update test

tests/SharpIDE.Application.UnitTests/Features/Analysis/RoslynAnalysisTests.cs

@@ -0,0 +1,50 @@
+using System.Diagnostics;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Logging;
+using SharpIDE.Application.Features.Analysis;
+using SharpIDE.Application.Features.Build;
+using SharpIDE.Application.Features.SolutionDiscovery.VsPersistence;
+
+[assembly: CaptureConsole]
+
+namespace SharpIDE.Application.UnitTests.Features.Analysis;
+public class RoslynAnalysisTests
+{
+	private readonly ITestOutputHelper _testOutputHelper;
+
+	public RoslynAnalysisTests(ITestOutputHelper testOutputHelper)
+	{
+		_testOutputHelper = testOutputHelper;
+		SharpIdeMsbuildLocator.Register();
+	}
+
+
+	[Fact]
+    public async Task GetProjectDiagnostics_NoSolutionChanges_IsSubsequentlyCheaper()
+    {
+	    // Arrange
+	    var serviceCollection = new ServiceCollection();
+	    serviceCollection.AddApplication();
+
+	    var services = serviceCollection.BuildServiceProvider();
+	    var logger = services.GetRequiredService<ILogger<RoslynAnalysis>>();
+	    var buildService = services.GetRequiredService<BuildService>();
+
+	    var roslynAnalysis = new RoslynAnalysis(logger, buildService);
+
+	    var solutionModel = await VsPersistenceMapper.GetSolutionModel(@"C:\Users\Matthew\Documents\Git\SharpIDE\SharpIDE.sln", TestContext.Current.CancellationToken);
+	    var sharpIdeApplicationProject = solutionModel.AllProjects.Single(p => p.Name == "SharpIDE.Application");
+
+		roslynAnalysis._solutionLoadedTcs = new TaskCompletionSource(TaskCreationOptions.RunContinuationsAsynchronously);
+	    await roslynAnalysis.Analyse(solutionModel, TestContext.Current.CancellationToken);
+
+	    // Act
+	    foreach (var i in Enumerable.Range(1, 3))
+	    {
+		    var timer = Stopwatch.StartNew();
+		    await roslynAnalysis.GetProjectDiagnostics(sharpIdeApplicationProject, TestContext.Current.CancellationToken);
+		    timer.Stop();
+		    _testOutputHelper.WriteLine($"Diagnostics: {timer.ElapsedMilliseconds.ToString()}ms");
+	    }
+    }
+}