StackOverflow Exception when running tests with vstest.console.exe

[BenSchoen]

I have some tests using buint. The tests running in Visualstudio 2022. When running these tests with donet test or vstest.console.exe i got the exception below. I removed some test to check if a dedicated test is responsible for the error, but i had no success.

If i go back to version of bunit 1.18.4 i do not have the issue.

The active test run was aborted. Reason: Test host process crashed : Stack overflow. at System.Text.StringBuilder.Append(Char ByRef, Int32) at System.Text.StringBuilder.Append(System.String) at Bunit.Htmlizer.RenderAttributes(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32, Int32, System.String ByRef) at Bunit.Htmlizer.RenderElement(HtmlRenderingContext, System.ReadOnlySpan1, Int32) at Bunit.Htmlizer.RenderCore(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32) at Bunit.Htmlizer.RenderFrames(HtmlRenderingContext, System.ReadOnlySpan1, Int32, Int32) at Bunit.Htmlizer.RenderChildren(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32, Int32) at Bunit.Htmlizer.RenderElement(HtmlRenderingContext, System.ReadOnlySpan1, Int32) at Bunit.Htmlizer.RenderCore(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32) at Bunit.Htmlizer.RenderFrames(HtmlRenderingContext, System.ReadOnlySpan1, Int32, Int32) at Bunit.Htmlizer.RenderChildren(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32, Int32) at Bunit.Htmlizer.RenderElement(HtmlRenderingContext, System.ReadOnlySpan1, Int32) at Bunit.Htmlizer.RenderCore(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32) at Bunit.Htmlizer.RenderFrames(HtmlRenderingContext, System.ReadOnlySpan1, Int32, Int32) at Bunit.Htmlizer.RenderChildComponent(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32) at Bunit.Htmlizer.RenderCore(HtmlRenderingContext, System.ReadOnlySpan1, Int32) at Bunit.Htmlizer.RenderFrames(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32, Int32) at Bunit.Htmlizer.RenderCore(HtmlRenderingContext, System.ReadOnlySpan1, Int32) at Bunit.Htmlizer.RenderFrames(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32, Int32) at Bunit.Htmlizer.RenderChildComponent(HtmlRenderingContext, System.ReadOnlySpan1, Int32) at Bunit.Htmlizer.RenderCore(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32) at Bunit.Htmlizer.RenderFrames(HtmlRenderingContext, System.ReadOnlySpan1, Int32, Int32) at Bunit.Htmlizer.RenderChildComponent(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32) at Bunit.Htmlizer.RenderCore(HtmlRenderingContext, System.ReadOnlySpan1, Int32) at Bunit.Htmlizer.RenderFrames(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32, Int32) at Bunit.Htmlizer.RenderCore(HtmlRenderingContext, System.ReadOnlySpan1, Int32) at Bunit.Htmlizer.RenderFrames(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32, Int32) at Bunit.Htmlizer.RenderCore(HtmlRenderingContext, System.ReadOnlySpan1, Int32) at Bunit.Htmlizer.RenderFrames(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32, Int32) at Bunit.Htmlizer.RenderChildComponent(HtmlRenderingContext, System.ReadOnlySpan1, Int32) at Bunit.Htmlizer.RenderCore(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32) at Bunit.Htmlizer.RenderFrames(HtmlRenderingContext, System.ReadOnlySpan1, Int32, Int32) at Bunit.Htmlizer.RenderChildComponent(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32) at Bunit.Htmlizer.RenderCore(HtmlRenderingContext, System.ReadOnlySpan1, Int32) at Bunit.Htmlizer.RenderFrames(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32, Int32) at Bunit.Htmlizer.RenderCore(HtmlRenderingContext, System.ReadOnlySpan1, Int32) at Bunit.Htmlizer.RenderFrames(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32, Int32) at Bunit.Htmlizer.RenderChildren(HtmlRenderingContext, System.ReadOnlySpan1, Int32, Int32) at Bunit.Htmlizer.RenderElement(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32) at Bunit.Htmlizer.RenderCore(HtmlRenderingContext, System.ReadOnlySpan1, Int32) at Bunit.Htmlizer.RenderFrames(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32, Int32) at Bunit.Htmlizer.RenderCore(HtmlRenderingContext, System.ReadOnlySpan1, Int32) at Bunit.Htmlizer.RenderFrames(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32, Int32) at Bunit.Htmlizer.RenderChildComponent(HtmlRenderingContext, System.ReadOnlySpan1, Int32) at Bunit.Htmlizer.RenderCore(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32) at Bunit.Htmlizer.RenderFrames(HtmlRenderingContext, System.ReadOnlySpan1, Int32, Int32) at Bunit.Htmlizer.RenderChildren(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32, Int32) at Bunit.Htmlizer.RenderElement(HtmlRenderingContext, System.ReadOnlySpan1, Int32) at Bunit.Htmlizer.RenderCore(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32) at Bunit.Htmlizer.RenderFrames(HtmlRenderingContext, System.ReadOnlySpan1, Int32, Int32) at Bunit.Htmlizer.RenderChildComponent(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32) at Bunit.Htmlizer.RenderCore(HtmlRenderingContext, System.ReadOnlySpan1, Int32) at Bunit.Htmlizer.RenderFrames(HtmlRenderingContext, System.ReadOnlySpan1<Microsoft.AspNetCore.Components.RenderTree.RenderTreeFrame>, Int32, Int32) at Bunit.Htmlizer.RenderChildComponent(HtmlRenderingContext, System.ReadOnlySpan1, Int32) at Bunit.Htmlizer.RenderCore(HtmlRenderingContext, System.ReadOnlySpan`1, Int32) at Bunit.Htmlizer.RenderFrames(HtmlRenderingCon

• bUnit version: 1.22.9
• .NET Runtime and Blazor version: Blazor Server v7.0.0.0 @ .NET 7.0.2
• OS type and version: Windows 10

[linkdotnet]

Hey, thanks for reporting.

by any chance do you have any code (at best minimal and reproducible) that you could show?

often times such issues arise when you call something like Click inside WaitForHelpers.

[egil]

Hmm glancing at the stack trace, the endless loop seems to happen while generating rendered markup. As far as I know it should not be possible to have a self referring render tree.

I would really like to see the component-under-test and test case.

[BenSchoen]

Hey all

Tanks for the immediate response and hints. I tried to isolate the problem but without success. It seems that there is something which influences other tests....

I will try it soon and let you know when i found something.

[BenSchoen]

Hello

I am not able to extract the problem to a separate project. I have some findings:

• Tests running with VisualStudio Test Runner even in endless run
• Tests does not run with vstest.console.exe
• Tests does not run with dotnet test
• The amount of test influence the failure
• I am not able to extract the problem in a separate project
• It works with version 1.18.4 with all test runners

I build an example, that you can see how the setup and the test case is. I am sorry, i am not allowed to share the code here.... BunitTestProject.zip]

[egil]

Hi @BenSchoen,

I just downloaded your sample and ran it in Visual Studio without issues. Also ran fine from dotnet test. Did you include the failing test?

[BenSchoen]

No it is sadly not possible to let the test fail with the small project.... But the way i set up the test and the component is the same.

[egil]

Can you share the full project with us (privately, through email, if needed)?

[egil]

I think we have found the culprit. If things go as planned, we will have a preview release soon that you can test out.

[egil]

There should be a new 1.24.x-preview release out now. Please give it a go (remember to update both your projects that reference bunit).

[BenSchoen]

@egil Yes i can confirm that the problem is solved with the 1.24.x-preview