Capture output for win debugging

Author: eddymoulton

LibGit2Sharp.Tests/GlobalSettingsFixture.cs

@@ -78,8 +78,7 @@ public void LoadFromSpecifiedPath(string architecture)
 
                 var (output, exitCode) = ProcessHelper.RunProcess(testAppExe, arguments: $@"{NativeDllName.Name} ""{platformDir}""", workingDirectory: tempDir);
 
-                Assert.Empty(output);
-                Assert.Equal(0, exitCode);
+                Assert.True(exitCode == 0, $"Test app exited with code {exitCode}. Output: {output}");
             }
             finally
             {

LibGit2Sharp.Tests/TestHelpers/ProcessHelper.cs

@@ -28,6 +28,9 @@ public static (string, int) RunProcess(string fileName, string arguments, string
 
             process.Start();
 
+            process.BeginOutputReadLine();
+            process.BeginErrorReadLine();
+
             process.WaitForExit();
 
             return (output.ToString(), process.ExitCode);