Make sure we capture stderr

Author: andreasohlund

src/ServiceControlInstaller.Engine.UnitTests/Setup/SetupInstanceTests.cs

@@ -3,6 +3,7 @@
 using System;
 using System.Threading;
 using Engine.Setup;
+using Mono.Cecil.Cil;
 using NUnit.Framework;
 
 [TestFixture]
@@ -25,6 +26,7 @@ public void Should_capture_and_rethrow_non_zero_exit_codes()
         var ex = Assert.Throws<Exception>(() => InstanceSetup.Run(TestContext.CurrentContext.WorkDirectory, "SetupProcessFake.exe", "test", "non-zero-exit-code", Timeout.Infinite));
 
         Assert.That(ex.Message, Does.Contain("returned a non-zero exit code: 3"));
+        Assert.That(ex.Message, Does.Contain("Fake non zero exit code message"));
     }
 
     [Test]

src/SetupProcessFake/Program.cs

@@ -5,6 +5,8 @@
 
 if (args.Any(a => a == "non-zero-exit-code"))
 {
+    Console.Error.WriteLine("Fake non zero exit code message");
+
     return 3;
 }