Update SolutionAndProjectUtility.cs

Author: Youssef1313

src/Cli/dotnet/Commands/Test/SolutionAndProjectUtility.cs

@@ -230,6 +230,11 @@ public static IEnumerable<ParallelizableTestModuleGroupWithSequentialInnerModule
 
         string targetFramework = project.GetPropertyValue(ProjectProperties.TargetFramework);
         RunProperties runProperties = GetRunProperties(project, loggers);
+
+        // dotnet run throws the same if RunCommand is null or empty.
+        // In dotnet test, we are additionally checking that RunCommand is not dll.
+        // In any "default" scenario, RunCommand is never dll.
+        // If we found it to be dll, that is user explicitly setting RunCommand incorrectly.
         if (string.IsNullOrEmpty(runProperties.RunCommand) || runProperties.RunCommand.HasExtension(CliConstants.DLLExtension))
         {
             throw new GracefulException(
@@ -238,7 +243,6 @@ public static IEnumerable<ParallelizableTestModuleGroupWithSequentialInnerModule
                     "dotnet test",
                     "OutputType",
                     project.GetPropertyValue("OutputType")));
-
         }
 
         string projectFullPath = project.GetPropertyValue(ProjectProperties.ProjectFullPath);