Unify main and app output logs to improve the UX of failure investigation

src/Microsoft.DotNet.XHarness.Android/AdbRunner.cs

@@ -154,6 +154,9 @@ public bool TryDumpAdbLog(string outputFilePath, string filterSpec = "")
             Directory.CreateDirectory(Path.GetDirectoryName(outputFilePath) ?? throw new ArgumentNullException(nameof(outputFilePath)));
             File.WriteAllText(outputFilePath, result.StandardOutput);
             _log.LogInformation($"Wrote current ADB log to {outputFilePath}");
+            // The adb log is not directly accessible.
+            // Hence, we duplicate the log to the main console log to simplify the UX of failure investigation.
+            _log.LogInformation($"ADB log output:{Environment.NewLine}{result.StandardOutput}");
             return true;
         }
     }

src/Microsoft.DotNet.XHarness.Apple/AppOperations/AppRunnerBase.cs

@@ -327,8 +327,11 @@ private CancellationTokenSource CaptureLogStream(string appName, bool useSimctl,
         }
         else
         {
+            // For MacCatalyst, the test output log does not propagate to the main log.
+            // Hence, we duplicate the log to the main console log to simplify the UX of failure investigation.
+            IFileBackedLog aggregatedAppOutputLog = Log.CreateReadableAggregatedLog(_mainLog, log);
             _processManager
-                .ExecuteCommandAsync("log", logArgs, _mainLog, log, log, TimeSpan.FromDays(1), cancellationToken: streamCancellation)
+                .ExecuteCommandAsync("log", logArgs, _mainLog, aggregatedAppOutputLog, aggregatedAppOutputLog, TimeSpan.FromDays(1), cancellationToken: streamCancellation)
                 .DoNotAwait();
         }
 

src/Microsoft.DotNet.XHarness.Apple/AppOperations/AppTester.cs

@@ -190,7 +190,8 @@ public AppTester(
             using var crashLogs = new Logs(_logs.Directory);
 
             ICrashSnapshotReporter crashReporter = _snapshotReporterFactory.Create(_mainLog, crashLogs, isDevice: !isSimulator, device.Name);
-            using ITestReporter testReporter = _testReporterFactory.Create(_mainLog,
+            using ITestReporter testReporter = _testReporterFactory.Create(
+                _mainLog,
                 _mainLog,
                 _logs,
                 crashReporter,
@@ -361,11 +362,15 @@ private async Task RunDeviceTests(
             // We need to check for MT1111 (which means that mlaunch won't wait for the app to exit)
             IFileBackedLog aggregatedLog = Log.CreateReadableAggregatedLog(_mainLog, testReporter.CallbackLog);
 
+            // The app output log is not directly accessible. 
+            // Hence, we duplicate the log to the main console log to simplify the UX of failure investigation.
+            IFileBackedLog aggregatedAppOutputLog = Log.CreateReadableAggregatedLog(_mainLog, appOutputLog);
+
             var result = await RunAndWatchForAppSignal(() => _processManager.ExecuteCommandAsync(
                 mlaunchArguments,
                 aggregatedLog,
-                appOutputLog,
-                appOutputLog,
+                aggregatedAppOutputLog,
+                aggregatedAppOutputLog,
                 timeout,
                 envVars,
                 cancellationToken: cancellationToken));