Fix AutoFitMaxExperimentTimeTest (#5506)

*Fixed test Co-authored-by: Antonio Velazquez <anvelazq@microsoft.com>

Author: mstfbl

test/Microsoft.ML.AutoML.Tests/AutoFitTests.cs

@@ -12,6 +12,7 @@
 using Microsoft.ML.TestFramework;
 using Microsoft.ML.TestFramework.Attributes;
 using Microsoft.ML.TestFrameworkCommon;
+using Microsoft.ML.TestFrameworkCommon.Attributes;
 using Xunit;
 using Xunit.Abstractions;
 using static Microsoft.ML.DataOperationsCatalog;
@@ -375,8 +376,6 @@ public void AutoFitWithPresplittedData()
  }
 
  [LightGBMFact]
- //Skipping test temporarily. This test will be re-enabled once the cause of failures has been determined
- [Trait("Category", "SkipInCI")]
  public void AutoFitMaxExperimentTimeTest()
  {
  // A single binary classification experiment takes less than 5 seconds.
@@ -398,8 +397,30 @@ public void AutoFitMaxExperimentTimeTest()
  // can increase the run time of unit tests, and may not produce multiple runs.
  if (experiment.RunDetails.Select(r => r.Exception == null).Count() > 1 && experiment.RunDetails.Last().Exception != null)
  {
- Assert.True(experiment.RunDetails.Last().Exception.Message.Contains("Operation was canceled"),
- "Training process was not successfully canceled after maximum experiment time was reached.");
+ var expectedExceptionMessage = "Operation was canceled";
+ var lastException = experiment.RunDetails.Last().Exception;
+ var containsMessage = lastException.Message.Contains(expectedExceptionMessage);
+
+ if(lastException is AggregateException lastAggregateException)
+ {
+ // Sometimes multiple threads might throw the same "Operation was cancelled"
+ // exception and all of them are grouped inside an AggregateException
+ // Must check that all exceptions are the expected one.
+ containsMessage = true;
+ foreach (var ex in lastAggregateException.Flatten().InnerExceptions)
+ {
+ if (!ex.Message.Contains(expectedExceptionMessage))
+ {
+ containsMessage = false;
+ }
+ }
+ }
+
+
+ Assert.True(containsMessage,
+ $"Did not obtain '{expectedExceptionMessage}' error." +
+ $"Obtained unexpected error of type {lastException.GetType()} with message: {lastException.Message}");
+ 
  // Ensure that the best found model can still run after maximum experiment time was reached.
  IDataView predictions = experiment.BestRun.Model.Transform(trainData);
  }