Catastrophic error deserializing item #34. System.ArgumentException: An item with the same key has already been added #3075

vgurramdt · 2024-12-05T20:01:58Z

vgurramdt
Dec 5, 2024

I am receiving the following error when I try to run unit tests in azure devops using VSTest. How to identify which test cases are causing the issue?

2024-12-05T18:55:09.6048339Z ##[debug]ProxyRunRequest: HandleLogMessage Entered
2024-12-05T18:55:09.6053905Z ##[error]RunMessage : [xUnit.net 00:00:01.71] Bc.Logic.AncillaryProduct.E2E: Catastrophic error deserializing item https://github.com/xunit/visualstudio.xunit/issues/34: System.ArgumentException: An item with the same key has already been added. Key: 7f27d8f5ea80f5832ab67b31a13fc75051225279
2024-12-05T18:55:09.6055246Z ##[debug]Processed: ##vso[task.logissue type=error;]RunMessage : [xUnit.net 00:00:01.71] Bc.Logic.AncillaryProduct.E2E: Catastrophic error deserializing item https://github.com/xunit/visualstudio.xunit/issues/34: System.ArgumentException: An item with the same key has already been added. Key: 7f27d8f5ea80f5832ab67b31a13fc75051225279
2024-12-05T18:55:09.6055911Z at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
2024-12-05T18:55:09.6057642Z at Xunit.Runner.VisualStudio.VsTestRunner.RunTestsInAssembly(IRunContext runContext, IFrameworkHandle frameworkHandle, LoggerHelper logger, TestPlatformContext testPlatformContext, RunSettings runSettings, IMessageSinkWithTypes reporterMessageHandler, AssemblyRunInfo runInfo)

Answered by bradwilson

Apr 7, 2025

I have made a change which should hopefully resolve the exception, though I'm honestly not sure why there was any to begin with, as I don't think we should need concurrent containers here. xunit/visualstudio.xunit@e2c61c2

That's not going to resolve the problem where ADO appears to be asking to run multiple test cases with the same unique ID, but it should at least convert it from an exception back to the warning message that it should've been.

Available in 3.0.3-pre.3 https://xunit.net/docs/using-ci-builds

View full answer

bradwilson · 2025-01-24T18:15:56Z

bradwilson
Jan 24, 2025
Maintainer

Can you provide a repro project?

Thanks!

0 replies

olstakh · 2025-03-27T23:03:49Z

olstakh
Mar 27, 2025

I'm actually getting the same error when i use the following properties for VSTest task in ADO:

      batchingBasedOnAgentsOption: 'customBatchSize'
      customBatchSizeValue: '10' # or whatever

Without it - no such error from xunit. From what i've heard without these options vstest.console is being called, while with them some service api is used

1 reply

bradwilson Mar 28, 2025
Maintainer

I have no experience with the VSTest task in ADO, so I really have no idea what these flags do internally. Since that code is owned by the ADO team, have you raised an issue with the ADO team to investigate?

olstakh · 2025-03-28T20:13:31Z

olstakh
Mar 28, 2025

I have a feeling we'll be redirected back to xunit, since xunit is the one that fails :) I'll probably open a discussion there, not keeping my hopes up tho

Logs are similar to what OP was mentioning. Somewhere in the middle of the run, in between passed tests, i see several failures:


   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
   at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
   at Xunit.Runner.VisualStudio.VsTestRunner.RunTestsInAssembly(IRunContext runContext, IFrameworkHandle frameworkHandle, LoggerHelper logger, TestPlatformContext testPlatformContext, RunSettings runSettings, IMessageSinkWithTypes reporterMessageHandler, AssemblyRunInfo runInfo) in /_/src/xunit.runner.visualstudio/VsTestRunner.cs:line 519
##[error]RunMessage : [xUnit.net 00:00:06.02] MyAssembly: Catastrophic error deserializing item #4258: System.ArgumentException: An item with the same key has already been added. Key: b0227d7ea8319a0150503e21f6d27678368578ec
   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
   at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
   at Xunit.Runner.VisualStudio.VsTestRunner.RunTestsInAssembly(IRunContext runContext, IFrameworkHandle frameworkHandle, LoggerHelper logger, TestPlatformContext testPlatformContext, RunSettings runSettings, IMessageSinkWithTypes reporterMessageHandler, AssemblyRunInfo runInfo) in /_/src/xunit.runner.visualstudio/VsTestRunner.cs:line 519
##[error]RunMessage : [xUnit.net 00:00:06.02] MyAssembly: Catastrophic error deserializing item #4259: System.ArgumentException: An item with the same key has already been added. Key: b0227d7ea8319a0150503e21f6d27678368578ec
   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
   at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
   at Xunit.Runner.VisualStudio.VsTestRunner.RunTestsInAssembly(IRunContext runContext, IFrameworkHandle frameworkHandle, LoggerHelper logger, TestPlatformContext testPlatformContext, RunSettings runSettings, IMessageSinkWithTypes reporterMessageHandler, AssemblyRunInfo runInfo) in /_/src/xunit.runner.visualstudio/VsTestRunner.cs:line 519
##[error]RunMessage : [xUnit.net 00:00:06.02] MyAssembly: Catastrophic error deserializing item #4260: System.ArgumentException: An item with the same key has already been added. Key: b0227d7ea8319a0150503e21f6d27678368578ec
   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
   at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
   at Xunit.Runner.VisualStudio.VsTestRunner.RunTestsInAssembly(IRunContext runContext, IFrameworkHandle frameworkHandle, LoggerHelper logger, TestPlatformContext testPlatformContext, RunSettings runSettings, IMessageSinkWithTypes reporterMessageHandler, AssemblyRunInfo runInfo) in /_/src/xunit.runner.visualstudio/VsTestRunner.cs:line 519
##[error]RunMessage : [xUnit.net 00:00:06.02] MyAssembly: Catastrophic error deserializing item #4261: System.ArgumentException: An item with the same key has already been added. Key: b0227d7ea8319a0150503e21f6d27678368578ec
   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
   at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
   at Xunit.Runner.VisualStudio.VsTestRunner.RunTestsInAssembly(IRunContext runContext, IFrameworkHandle frameworkHandle, LoggerHelper logger, TestPlatformContext testPlatformContext, RunSettings runSettings, IMessageSinkWithTypes reporterMessageHandler, AssemblyRunInfo runInfo) in /_/src/xunit.runner.visualstudio/VsTestRunner.cs:line 519
##[error]RunMessage : [xUnit.net 00:00:06.02] MyAssembly: Catastrophic error deserializing item #4262: System.ArgumentException: An item with the same key has already been added. Key: b0227d7ea8319a0150503e21f6d27678368578ec
   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
   at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
   at Xunit.Runner.VisualStudio.VsTestRunner.RunTestsInAssembly(IRunContext runContext, IFrameworkHandle frameworkHandle, LoggerHelper logger, TestPlatformContext testPlatformContext, RunSettings runSettings, IMessageSinkWithTypes reporterMessageHandler, AssemblyRunInfo runInfo) in /_/src/xunit.runner.visualstudio/VsTestRunner.cs:line 519
##[error]RunMessage : [xUnit.net 00:00:06.02] MyAssembly: Catastrophic error deserializing item #4263: System.ArgumentException: An item with the same key has already been added. Key: b0227d7ea8319a0150503e21f6d27678368578ec
   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
   at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
   at Xunit.Runner.VisualStudio.VsTestRunner.RunTestsInAssembly(IRunContext runContext, IFrameworkHandle frameworkHandle, LoggerHelper logger, TestPlatformContext testPlatformContext, RunSettings runSettings, IMessageSinkWithTypes reporterMessageHandler, AssemblyRunInfo runInfo) in /_/src/xunit.runner.visualstudio/VsTestRunner.cs:line 519

I don't know what these keys are, but they do look same. If you know how these keys are assigned and what the expectation is from them - i can provide this information to the discussion in vstest

From what i've heard setting custom batch size results in invoking vstest via translation layer, instead of cmd. Somehow this results in catastrophic failure somewhere in the middle here

0 replies

bradwilson · 2025-04-07T04:02:58Z

bradwilson
Apr 7, 2025
Maintainer

I have made a change which should hopefully resolve the exception, though I'm honestly not sure why there was any to begin with, as I don't think we should need concurrent containers here. xunit/visualstudio.xunit@e2c61c2

That's not going to resolve the problem where ADO appears to be asking to run multiple test cases with the same unique ID, but it should at least convert it from an exception back to the warning message that it should've been.

Available in 3.0.3-pre.3 https://xunit.net/docs/using-ci-builds

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