minor fixes

tests/ImageSharp.Tests/AssemblyInfo.cs

@@ -3,4 +3,4 @@
 
 using System.Runtime.CompilerServices;
 
-[assembly:InternalsVisibleTo("SixLabors.ImageSharp.Sandbox46")]
+[assembly:InternalsVisibleTo("ImageSharp.Tests.ProfilingSandbox")]

tests/ImageSharp.Tests/TestUtilities/TestEnvironment.cs

@@ -196,8 +196,12 @@ namespace SixLabors.ImageSharp.Tests
             proc.WaitForExit();
             string standardOutput = proc.StandardOutput.ReadToEnd();
             string standardError = proc.StandardError.ReadToEnd();
-            Debug.Print(standardOutput);
+
-            Debug.Print(standardError);
+            if (proc.ExitCode != 0)
+            {
+                throw new Exception(
+                    $@"Failed to run {si.FileName} {si.Arguments}:\n STDOUT: {standardOutput}\n STDERR: {standardError}");
+            }
 
             static FileInfo Find(DirectoryInfo root, string name)
             {