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Debug.Assert failures don't appear in the CI

See original GitHub issue

E.g. in https://github.com/dotnet/winforms/pull/274 all the Debug CI says is: https://dnceng.visualstudio.com/public/_build/results?buildId=64113

2018-12-30T00:24:03.6894940Z ##[section]Starting: Windows Build / Publish
2018-12-30T00:24:03.6898330Z ==============================================================================
2018-12-30T00:24:03.6898453Z Task         : Command Line
2018-12-30T00:24:03.6898561Z Description  : Run a command line script using cmd.exe on Windows and bash on macOS and Linux.
2018-12-30T00:24:03.6899122Z Version      : 2.142.2
2018-12-30T00:24:03.6899213Z Author       : Microsoft Corporation
2018-12-30T00:24:03.6899310Z Help         : [More Information](https://go.microsoft.com/fwlink/?LinkID=613735)
2018-12-30T00:24:03.6899415Z ==============================================================================
2018-12-30T00:24:04.6567772Z Generating script.
2018-12-30T00:24:04.6682829Z Script contents:
2018-12-30T00:24:04.6688452Z eng\common\cibuild.cmd -configuration Debug -prepareMachine   
2018-12-30T00:24:04.7248531Z ##[command]"C:\Windows\system32\cmd.exe" /D /E:ON /V:OFF /S /C "CALL "F:\vsagent\_temp\8a2c7d10-e0e1-452c-b838-667c67b22baa.cmd""
2018-12-30T00:24:05.9551282Z dotnet-install: Downloading link: https://dotnetcli.azureedge.net/dotnet/Sdk/3.0.100-preview-009820/dotnet-sdk-3.0.100-preview-009820-win-x64.zip
2018-12-30T00:24:07.0731103Z dotnet-install: Extracting zip from https://dotnetcli.azureedge.net/dotnet/Sdk/3.0.100-preview-009820/dotnet-sdk-3.0.100-preview-009820-win-x64.zip
2018-12-30T00:24:36.1620892Z dotnet-install: Adding to current process PATH: "F:\vsagent\68\s\.dotnet\". Note: This change will not be visible if PowerShell was run as a child process.
2018-12-30T00:24:36.1648616Z dotnet-install: Installation finished
2018-12-30T00:24:36.9903158Z F:\vsagent\68\s\.dotnet\sdk\3.0.100-preview-009820\MSBuild.dll /noconsolelogger /nologo -maxcpucount /m -verbosity:m /v:minimal /bl:F:\vsagent\68\s\artifacts\log\Debug\ToolsetRestore.binlog /clp:Summary /nr:False /p:TreatWarningsAsErrors=true /p:__ToolsetLocationOutputFile=F:\vsagent\68\s\artifacts\toolset\1.0.0-beta.18621.6.txt /t:__WriteToolsetLocation /warnaserror F:\vsagent\68\s\artifacts\toolset\restore.proj
2018-12-30T00:24:39.2958371Z F:\vsagent\68\s\.dotnet\sdk\3.0.100-preview-009820\MSBuild.dll /nologo -maxcpucount /m -verbosity:m /v:minimal /bl:F:\vsagent\68\s\artifacts\log\Debug\Build.binlog /clp:Summary /nr:False /p:TreatWarningsAsErrors=true /p:Configuration=Debug /p:RepoRoot=F:\vsagent\68\s /p:Restore=True /p:DeployDeps=False /p:Build=True /p:Rebuild=False /p:Deploy=False /p:Test=True /p:Pack=True /p:IntegrationTest=False /p:PerformanceTest=False /p:Sign=True /p:Publish=True /p:Execute=False /p:ContinuousIntegrationBuild=True /warnaserror F:\vsagent\68\s\.packages\microsoft.dotnet.arcade.sdk\1.0.0-beta.18621.6\tools\Build.proj
2018-12-30T00:24:40.1225991Z   Restoring packages for F:\vsagent\68\s\.packages\microsoft.dotnet.arcade.sdk\1.0.0-beta.18621.6\tools\Tools.proj...
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2018-12-30T00:24:41.1104181Z   Restore completed in 974.54 ms for F:\vsagent\68\s\.packages\microsoft.dotnet.arcade.sdk\1.0.0-beta.18621.6\tools\Tools.proj.
2018-12-30T00:24:43.0967699Z   Restoring packages for F:\vsagent\68\s\src\System.Drawing.Design\src\System.Drawing.Design.Facade.csproj...
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2018-12-30T00:24:43.7209738Z   Installing Microsoft.NETCore.DotNetAppHost 3.0.0-preview-27205-02.
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2018-12-30T00:24:44.3818467Z   Installing System.Configuration.ConfigurationManager 4.6.0-preview.18606.1.
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2018-12-30T00:24:51.8423361Z   Generating MSBuild file F:\vsagent\68\s\artifacts\obj\Microsoft.Private.Winforms\Microsoft.Private.Winforms.csproj.nuget.g.props.
2018-12-30T00:24:51.8481393Z   Generating MSBuild file F:\vsagent\68\s\artifacts\obj\System.Windows.Forms.Design.Editors.Ref\System.Windows.Forms.Design.Editors.Ref.csproj.nuget.g.props.
2018-12-30T00:24:51.8503909Z   Generating MSBuild file F:\vsagent\68\s\artifacts\obj\System.Drawing.Design.Facade\System.Drawing.Design.Facade.csproj.nuget.g.props.
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2018-12-30T00:24:51.8825602Z   Restore completed in 8.79 sec for F:\vsagent\68\s\src\System.Design\src\System.Design.Facade.csproj.
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2018-12-30T00:26:01.7953336Z   Running tests: F:\vsagent\68\s\artifacts\bin\System.Windows.Forms.Design.Editors.Tests\Debug\netcoreapp3.0\System.Windows.Forms.Design.Editors.Tests.dll [netcoreapp3.0|x64]
2018-12-30T00:26:01.7961152Z   Running tests: F:\vsagent\68\s\artifacts\bin\System.Windows.Forms.Tests\Debug\netcoreapp3.0\System.Windows.Forms.Tests.dll [netcoreapp3.0|x64]
2018-12-30T00:26:02.7055374Z   Tests succeeded: F:\vsagent\68\s\artifacts\bin\System.Windows.Forms.Design.Editors.Tests\Debug\netcoreapp3.0\System.Windows.Forms.Design.Editors.Tests.dll [netcoreapp3.0|x64]
2018-12-30T00:26:02.9370821Z   Running tests: F:\vsagent\68\s\artifacts\bin\System.Windows.Forms.Design.Tests\Debug\netcoreapp3.0\System.Windows.Forms.Design.Tests.dll [netcoreapp3.0|x64]
2018-12-30T00:26:03.2815779Z XUnit : error : Tests failed: F:\vsagent\68\s\artifacts\log\Debug\System.Windows.Forms.Tests_netcoreapp3.0_x64.log [netcoreapp3.0|x64] [F:\vsagent\68\s\src\System.Windows.Forms\tests\UnitTests\System.Windows.Forms.Tests.csproj]
2018-12-30T00:26:04.5205385Z   Tests succeeded: F:\vsagent\68\s\artifacts\bin\System.Windows.Forms.Design.Tests\Debug\netcoreapp3.0\System.Windows.Forms.Design.Tests.dll [netcoreapp3.0|x64]
2018-12-30T00:26:04.9253866Z 
2018-12-30T00:26:04.9432462Z Build FAILED.
2018-12-30T00:26:04.9432790Z 
2018-12-30T00:26:04.9591796Z XUnit : error : Tests failed: F:\vsagent\68\s\artifacts\log\Debug\System.Windows.Forms.Tests_netcoreapp3.0_x64.log [netcoreapp3.0|x64] [F:\vsagent\68\s\src\System.Windows.Forms\tests\UnitTests\System.Windows.Forms.Tests.csproj]
2018-12-30T00:26:04.9592565Z     0 Warning(s)
2018-12-30T00:26:04.9592914Z     1 Error(s)
2018-12-30T00:26:04.9593171Z 
2018-12-30T00:26:04.9593579Z Time Elapsed 00:01:25.50
2018-12-30T00:26:05.0538074Z Build failed.
2018-12-30T00:26:05.0618424Z See log: F:\vsagent\68\s\artifacts\log\Debug\Build.binlog
2018-12-30T00:26:05.0681401Z Killing running build processes...
2018-12-30T00:26:05.2443878Z ##[error]Cmd.exe exited with code '1'.
2018-12-30T00:26:05.3264632Z ##[section]Finishing: Windows Build / Publish

Issue Analytics

State:
Created 5 years ago
Comments:20 (20 by maintainers)

Top GitHub Comments

2reactions

AdamYoblickcommented, Jan 9, 2019

First let me say that I know I’m in the minority with this opinion. Engineers tend to value performance over everything else, but I do not. 😃

I get that Debug.Assert is better performance than throwing exceptions. My argument is that it’s safer for every method (even privates) to just validate its own arguments with exceptions. This guarantees that the inputs are valid for any method, regardless of the call stack, regardless of the config.

I understand that means you are often validating the same argument multiple times, which is why people prefer Debug.Assert. But I prefer a safe (and properly unit testable) method over a little performance gain.

What if someone else (another dev) sees this private method and uses it, but doesn’t realize they have to validate the args before passing them down? I would rather eliminate this possibility entirely and make my method bulletproof.

Again, I know this is not a popular opinion, but I’ve been burned too many times by methods not validating their own args. In my experience, the performance cost of a couple IF statements is worth the “stronger” code.

1reaction

stephentoubcommented, Jan 10, 2019

Thanks for summarizing.

My comment was we should not have to do this.

If the tests in question are validating public surface area, then from my perspective no Debug.Assert should ever be triggerable. In such a case, there’s a bad bug, either the assert itself is bad or the important invariant its validating isn’t being held, and it fail fasts; this isn’t something to be validating via Assert.Throws because you should never be able to cause such errors to happen via the public surface area.

However, I remember earlier discussions that were advocating for being able to use InternalsVisibleTo to unit test via internals rather than publics. If these asserts are triggering because of misuse at that level, I have no sympathy 😉