Handling an exception that happens when dotnet run is invoked with a file that is not a valid project file. We catch that exception and re-throw it as a GracefulException.

test/dotnet-run.Tests/GivenThatWeCanPassNonProjectFilesToDotnetRun.cs

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+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System.IO;
+using FluentAssertions;
+using Microsoft.DotNet.TestFramework;
+using Microsoft.DotNet.Tools.Test.Utilities;
+using Xunit;
+
+namespace Microsoft.DotNet.Cli.Run.Tests
+{
+    public class GivenThatWeCanPassNonProjectFilesToDotnetRun : TestBase
+    {
+        [Fact]
+        public void ItFailsWithAnAppropriateErrorMessage()
+        {
+            var projectDirectory = TestAssets
+                .Get("SlnFileWithNoProjectReferences")
+                .CreateInstance()
+                .WithSourceFiles()
+                .Root
+                .FullName;
+
+            var slnFullPath = Path.Combine(projectDirectory, "SlnFileWithNoProjectReferences.sln");
+
+            new RunCommand()
+                .ExecuteWithCapturedOutput($"-p {slnFullPath}")
+                .Should().Fail()
+                .And.HaveStdErrContaining(
+                    string.Format(
+                        Microsoft.DotNet.Tools.Run.LocalizableStrings.RunCommandSpecifiecFileIsNotAValidProject,
+                        slnFullPath));
+        }
+    }
+}