[Failing test]: Aspire.Cli.EndToEnd.Tests.MultipleAppHostTests.DetachFormatJsonProducesValidJson

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Build information

Build: https://github.com/dotnet/aspire/actions/runs/22925166665
Build error leg or test failing: Aspire.Cli.EndToEnd.Tests.MultipleAppHostTests.DetachFormatJsonProducesValidJson
Pull Request: #15110

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Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": "An unexpected error occurred: Expected depth to be zero at the end of the JSON payload.",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Other info

• Failing job: https://github.com/dotnet/aspire/actions/runs/22925166665/job/66535776281
• Matching artifact: logs-Cli.EndToEnd-MultipleAppHostTests-ubuntu-latest
• Extracted TRX failure:
  • Hex1b.Automation.WaitUntilTimeoutException : WaitUntil timed out after 00:08:20 waiting for:
  • Stack trace points to Aspire.Cli.EndToEnd.Tests.MultipleAppHostTests.DetachFormatJsonProducesValidJson() in tests/Aspire.Cli.EndToEnd.Tests/MultipleAppHostTests.cs:128
  • Test duration: 00:09:13.2227639
• Artifact recording: testresults/recordings/DetachFormatJsonProducesValidJson.cast
• CiInsights currently reports this test as broken over the last 180 days with 29/29 failures and 0 passes.

Full captured test output

Source artifact: logs-Cli.EndToEnd-MultipleAppHostTests-ubuntu-latest

TRX StdOut

Temporary workspace created at: /tmp/Aspire.Cli.Tests/TemporaryWorkspaces/813fec7d-ce9f-4c83-a94b-6ffefdf68144

TRX ErrorInfo.Message

Hex1b.Automation.WaitUntilTimeoutException : WaitUntil timed out after 00:08:20 waiting for: snapshot =>
            {
                var successPromptSearcher = new CellPatternSearcher()
                    .FindPattern(counter.Value.ToString())
                    .RightText(" OK] $ ");

                var result = successPromptSearcher.Search(snapshot);
                return result.Count > 0;
            }
  at Hex1bTestHelpers.cs:92
Terminal (160x48, cursor at 13,5, normal screen):
[10 OK] $ aspire run --detach --format json > output.json                                                                                                       
DOTNET_DbgEnableMiniDump is set and the createdump binary does not exist: createdump                                                                            
\ud83d\udd0d Finding apphosts...                                                                                                                                          
❌ An unexpected error occurred: Expected depth to be zero at the end of the JSON payload. There is an open JSON object or array that should be closed.         
LineNumber: 1 | BytePositionInLine: 0.                                                                                                                          
[11 ERR:1] $                                                                                                                                                    

TRX StackTrace

   at Hex1b.Automation.WaitUntilStep.ExecuteAsync(Hex1bTerminal terminal, Hex1bTerminalInputSequenceOptions options, CancellationToken ct) in /home/runner/work/hex1b/hex1b/src/Hex1b/Automation/WaitUntilStep.cs:line 39
   at Hex1b.Automation.Hex1bTerminalInputSequence.ApplyAsync(Hex1bTerminal terminal, CancellationToken ct) in /home/runner/work/hex1b/hex1b/src/Hex1b/Automation/Hex1bTerminalInputSequence.cs:line 41
   at Aspire.Cli.EndToEnd.Tests.MultipleAppHostTests.DetachFormatJsonProducesValidJson() in /_/tests/Aspire.Cli.EndToEnd.Tests/MultipleAppHostTests.cs:line 128
--- End of stack trace from previous location ---

Terminal output from DetachFormatJsonProducesValidJson.cast

[10 OK] $ aspire run --detach --format json > output.json
DOTNET_DbgEnableMiniDump is set and the createdump binary does not exist: createdump
🔍 Finding apphosts...

⠋ Searching...


⠙ Searching...


⠚ Searching...


⠞ Searching...


⠖ Searching...


⠦ Searching...


⠴ Searching...


⠲ Searching...


⠳ Searching...


⠓ Searching...


⠋ Searching...


⠙ Searching...


⠚ Searching...


⠞ Searching...


⠖ Searching...


⠦ Searching...


⠴ Searching...


⠲ Searching...


⠳ Searching...


⠓ Searching...


⠋ Searching...


⠙ Searching...


⠚ Searching...


⠞ Searching...


⠖ Searching...

❌ An unexpected error occurred: Expected depth to be zero at the end of the JSON payload. There is an open JSON object or array that should be closed. 
LineNumber: 1 | BytePositionInLine: 0.
[11 ERR:1] $

Known issue validation

Build: 🔎
Result validation: ⚠️ Validation could not be done without an Azure DevOps build URL on the issue. Please add it to the "Build: 🔎" line.
Validation performed at: 3/10/2026 10:20:29 PM UTC

📊 View CI Failure Report

[MihuBot]

I'm a bot. Here is a possible related and/or duplicate issue (I may be wrong):

• MultipleAppHostTests failed: Check aspire run detach --format json does not bleed output to the command line #14819

[radical]

cc @davidfowl @mitchdenny