Integration tests failed with exception "The Functions Host Runtime did not start properly after 180 seconds"

[hejingkan2005]

Version

Dotnet Version: 8.0.403/8.0.404
Azure Function Core Tools Version: 4.0.6594

Description

Hit below exception in Onebranch pipeline, we don't meet this error before, and reverting to version 4.0.6543 seems mitigate the issue:

[xUnit.net 00:03:02.80] Learn.VectorSearch.API.IntegrationTests.RelevanceApiTest.TestGetRelevantItemByText(category: QnA, input: "What is the best programming language", count: 0, expectedItemId: "", score: "") [FAIL]
Failed Learn.VectorSearch.API.IntegrationTests.ItemSpecApiTest.TestGetItemSpecByItemId_NotExistingItem(category: QnA, contentId: "invalidId") [1 ms]
Error Message:
System.Exception : The Functions Host Runtime did not start properly after 180 seconds.
Stack Trace:
at Microsoft.Learn.AzureFunctionsTesting.FunctionFixture1.InitializeAsync() at Microsoft.Docs.FunctionsIntegrationTesting.DocsFunctionFixture1.InitializeAsync()

Steps to reproduce

• Install Azure Function Core Tools version: 4.0.6594
• Run a pipeline relying on this version of Azure Function Core Tools
• Repro the exception in description.
• Revert to version: 4.0.6543 will resolve this.

[liliankasem]

@aishwaryabh could this be related to the other ADO issue you were looking at? #4156 (comment)

[hejingkan2005]

@liliankasem , thank you for reference. Btw, I just verified with the latest release version 4.0.6610, unfortunately it looks the same issue.

[ksgopal4]

We have same issue, integration tests fail as func start no longer works. Output seems to indicate that func start needs more information

 Select a number for worker runtime:
1. dotnet (isolated worker model)
2. dotnet (in-process model)
3. node
4. python
5. powershell
6. custom

It seems that func start now requires the following as part of local.setting.json
"FUNCTIONS_WORKER_RUNTIME": "dotnet-isolated"
local.setting.json file is not available on my build server as its not checked in to source control. This value is being passed in via environment variables, but it appears func start no longer looks at environment variables