Migrate test exclusions from issues.targets to inline ActiveIssue attributes #123248

Copilot · 2026-01-16T02:12:07Z

Description

Migrated 1,201 test exclusions from centralized src/tests/issues.targets to inline [ActiveIssue] attributes on test methods, making exclusions discoverable in source code and eliminating a 1,442-line centralized file.

Changes

Migration Infrastructure

Created migrate_exclusions.py script mapping 50+ MSBuild condition patterns to C#/IL ActiveIssue attributes per specification
Implemented suffix-stripping logic for renamed tests (_d, _r, _ro, _do suffixes)
Added base IL file inclusion when processing suffixed IL files (e.g., array1_r.il includes array1.il)
Applied special handling: issue 64127 → PlatformDoesNotSupportNativeTestAssets, issue 41472 → IsThreadingSupported

CoreCLR Test Infrastructure

Added IsThreadingSupported property to CoreCLRTestLibrary/PlatformDetection.cs (copied from libraries)
Added dependent properties: IsBrowser, IsWasi, IsWasmThreadingSupported

Test File Migrations

Modified 1,676 test files with inline ActiveIssue attributes
Added 51 missing using TestLibrary; directives to fix initial build failures
Fixed 6 XML tag mismatches (changed closing tags from </Crossgen2> to </CrossGenTest>)
Fixed extern alias ordering issue (CS0439) by moving using directives after extern alias declarations
Added missing TestLibrary project references to 2 projects (struct01_Structs.csproj, rtchecks.csproj)
Preserved all XML comments in project files during migration

issues.targets Cleanup

Reduced from 3,447 lines to 9 lines (99.7% reduction)
Removed all 1,201 ExcludeList items
Retained only Target infrastructure definitions

Example Migration

Before (issues.targets):

<ItemGroup Condition="'$(XunitTestBinBase)' != ''">
    <ExcludeList Include="$(XunitTestBinBase)/baseservices/finalization/CriticalFinalizer/*">
        <Issue>https://github.com/dotnet/runtime/issues/76041</Issue>
    </ExcludeList>
</ItemGroup>

After (test file):

using TestLibrary;

[ActiveIssue("https://github.com/dotnet/runtime/issues/76041", TestPlatforms.Any)]
[Fact]
public static int TestEntryPoint() { }

Special Cases:

// Issue 64127: Native test assets
[ActiveIssue("https://github.com/dotnet/runtime/issues/64127", 
    typeof(PlatformDetection), 
    nameof(PlatformDetection.PlatformDoesNotSupportNativeTestAssets))]

// Issue 41472: Threading support
[ActiveIssue("https://github.com/dotnet/runtime/issues/41472", 
    typeof(PlatformDetection), 
    nameof(PlatformDetection.IsThreadingSupported))]

// Arrays with non-zero lower bounds
[ActiveIssue("https://github.com/dotnet/runtimelab/issues/155: Arrays with non-zero lower bounds",
    typeof(PlatformDetection),
    nameof(PlatformDetection.IsNonZeroLowerBoundArrayNotSupported))]

Original prompt

We are going to replace the test exclusions from issues.targets with test exclusions defined in attributes on specific tests or properties defined in the project file.

How to find tests for a given ExcludeList item

A given ExcludeList item includes a path that represents the output directory of a given test project or the parent directory of the output directories of multiple test projects. From this output directory, we want to find the source projects that correspond to the output directory.

There is a two-phase process for finding project files that match a given ExcludeList item in issues.targets.

Phase 1: Preparation

For a given item, treat $(XunitTestBinBase) as the src/tests folder in this repo.
Replace $(XunitTestBinBase) with src/tests to get the actual path.
Remove the glob expressions at the end of the path (the /* or /** suffix).
- For example, $(XunitTestBinBase)/baseservices/finalization/CriticalFinalizer/* becomes src/tests/baseservices/finalization/CriticalFinalizer.
- For example, $(XunitTestBinBase)/Interop/PInvoke/BestFitMapping/**/* becomes $(XunitTestBinBase)/Interop/PInvoke/BestFitMapping

Phase 2: Search for project files (try both approaches)

Approach A - Recursive search:
Search for all .csproj, .ilproj, or .fsproj project files recursively under the directory path from step 3.

This handles cases like $(XunitTestBinBase)/Interop/MonoAPI/** where projects are in subdirectories.

If any project files are found, stop searching and go to the next section (How to provide a replacement).

Approach B - Specific file match:
If Approach A found nothing, check if there is a project file in the directory itself with a name matching the last path segment.

Using the example src/tests/baseservices/finalization/CriticalFinalizer, look for:
- src/tests/baseservices/finalization/CriticalFinalizer.csproj OR
- src/tests/baseservices/finalization/CriticalFinalizer.ilproj OR
- src/tests/baseservices/finalization/CriticalFinalizer.fsproj
This handles cases where the ExcludeList points to a single test project.

If no projects are found after both approaches, report that no projects were found for this ExcludeList item.

How to provide a replacement

Once you've found the project file(s) for an ExcludeList item, you need to migrate the exclusion from issues.targets to the project itself.

Step 1: Identify the condition

Look at the Condition attribute on the <ItemGroup> element that contains the ExcludeList item in issues.targets. The comment above the ItemGroup describes what the condition represents.

Example:

<!-- All OS/Arch/Runtime excludes -->
<ItemGroup Condition="'$(XunitTestBinBase)' != ''">
    <ExcludeList Include="$(XunitTestBinBase)/Interop/PInvoke/Int128/Int128Test/*">
        <Issue>https://github.com/dotnet/runtime/issues/74209</Issue>
    </ExcludeList>
</ItemGroup>

The condition here is "All OS/Arch/Runtime excludes".

Step 2: Look up the replacement in the table below

Find the row in the table that matches the condition. The table provides:

C# attribute: For C# test files (.cs)
IL attribute: For IL test files (.il)
Project Property: For project files (.csproj, .ilproj, .fsproj)

Step 3: Extract the Issue value

Get the value from the <Issue> element in the ExcludeList item. In the example above, it's https://github.com/dotnet/runtime/issues/74209.

Replace the literal string <Issue> in the attribute/property with this value.

Step 4: Apply the replacement

Choose the appropriate replacement based on the file type:

For C# files (.cs):

Add the C# attribute from the table to every method that has [Fact] or [Theory] on it
Add these using directives at the top (if not already present):
```
using Xunit;
using TestLibrary;
```
Ensure the .csproj file has a ProjectReference to $(TestLibraryProjectPath) (if not already present)

For IL files (.il):

Add the IL attribute from the table to every method that has a [Fact] or [Theory] attribute on it

Add these assembly references after the xunit.core reference (if not already present):

.assembly extern Microsoft.DotNet.XUnitExtensions {}
.assembly extern TestLibrary { .ver 0:0:0:0 }

For Project Properties:

If the table shows a Project Property, add it to the project file (.csproj, .ilproj, or .fsproj)
Some conditions only have project properties and no attributes - in these cases, skip the source file changes

Step 5: Handle multiple projects

If an ExcludeList item maps to multiple projects (found via recursive search), apply the replacement to all of them.

Replacement Mapping Table

The table below maps each condition type to its corresponding attributes and properties. Use this table in Step 2 above.

Note: <Issue> is a place...

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

…used in issues.targets

Co-authored-by: jkoritzinsky <[email protected]>

- Migrated DynamicMethodGCStress test - Migrated CriticalFinalizer test - Migrated ExposedLocalsNumbering test - Removed migrated items from issues.targets - Int128Test skipped (no project file found) Co-authored-by: jkoritzinsky <[email protected]>

Co-authored-by: jkoritzinsky <[email protected]>

jkoritzinsky

@copilot so far looks good. Please continue processing for the remaining entries.

src/tests/baseservices/finalization/CriticalFinalizer.csproj

Restored the "Needed for GC.WaitForPendingFinalizers" comment that was inadvertently removed. Co-authored-by: jkoritzinsky <[email protected]>

Applied ActiveIssue attributes to ~966 test projects, migrating exclusions from issues.targets to inline attributes on test methods and properties. Changes include: - Added [ActiveIssue] attributes to C# test files - Added using TestLibrary and using Xunit directives where needed - Added TestLibrary project references to .csproj files - IL files flagged for manual review (automated attribute addition needs verification) 235 exclusions without project files remain in issues.targets for manual handling. Co-authored-by: jkoritzinsky <[email protected]>

Removed 966 migrated ExcludeList items from issues.targets. Remaining 98 items are for tests without project files (CMake-based tests) that require manual migration. Co-authored-by: jkoritzinsky <[email protected]>

Copilot · 2026-01-16T02:50:02Z

@copilot so far looks good. Please continue processing for the remaining entries.

Completed! Migrated all 966 remaining test exclusions to inline attributes (commits f5d1c36 and f26f59a).

Summary:

1,624 test files modified with [ActiveIssue] attributes
966 ExcludeList items removed from issues.targets
98 items remain (CMake-based tests without project files)
All XML comments preserved in project files

jkoritzinsky · 2026-01-16T04:38:49Z

@copilot There were a number of test exclusions under the following comment in issues.targets:

<!-- Arrays with non-zero lower bounds -->
        <!-- https://github.com/dotnet/runtimelab/issues/155 -->

Please add the following string as the reason/issue for those tests in their ActiveIssue attributes: "https://github.com/dotnet/runtimelab/issues/155: Arrays with non-zero lower bounds"

Updated 26 test files (23 IL + 3 C#) to include the detailed issue string: "https://github.com/dotnet/runtimelab/issues/155: Arrays with non-zero lower bounds" This provides better context for why these tests are excluded for NativeAOT. Co-authored-by: jkoritzinsky <[email protected]>

Copilot · 2026-01-16T04:51:20Z

@copilot There were a number of test exclusions under the following comment in issues.targets:

Done in 477476e. Updated 26 test files (23 IL + 3 C#) with the detailed issue string: "https://github.com/dotnet/runtimelab/issues/155: Arrays with non-zero lower bounds"

jkoritzinsky · 2026-01-16T05:30:33Z

@copilot for just the tests you updated in 477476e, please change attribute to use the IsNonZeroLowerBoundArrayNotSupported property instead of the IsNativeAot property

…untime into copilot/replace-test-exclusions

Updated migration script to handle renamed tests where ExcludeList path contains suffixes (_d, _r, _ro, _do) but actual source files don't have these suffixes. Changes: - Enhanced find_project_files() to strip _d, _r, _ro, _do suffixes and retry - Added find_source_files() to find .cs/.il files when no project files exist - Updated migrate_exclusion() to apply attributes directly to source files when: * No project files found * Mapping has both C# and IL attributes * Source files are found with suffix-stripped name This enables migration of tests like stress1_r, stress1_do, stress1_ro which reference stress1.cs as their source file. Co-authored-by: jkoritzinsky <[email protected]>

When processing IL files with suffixes (_d, _r, _ro, _do), the script now also includes the corresponding base IL file for attribute addition. This is necessary because suffixed IL files typically include/reference the base IL file. Example: - Processing array1_r.ilproj includes array1_r.il - Script now also adds array1.il to the list of files to process - Both files receive the ActiveIssue attribute This applies to: 1. Project-based processing (when .ilproj exists) 2. Source file-based processing (when no project file exists) Co-authored-by: jkoritzinsky <[email protected]>

Migrated all 452 remaining test exclusions from issues.targets to inline ActiveIssue attributes using enhanced migration logic that handles renamed tests. Key improvements applied: - Suffix stripping: Tests with _d, _r, _ro, _do suffixes now correctly map to base source files - Base IL file inclusion: When processing suffixed IL files (e.g., array1_r.il), automatically includes base IL file (array1.il) - Special issue handling: Issues 64127 uses PlatformDoesNotSupportNativeTestAssets, issue 41472 uses IsThreadingSupported Migration results: - Successfully migrated: 452 items - Files modified: 92 C# test files - issues.targets reduced from 1,451 lines to 9 lines (only infrastructure remains) - No ExcludeList items remain Examples of migrations: 1. stress1_r/stress1_do/stress1_ro → stress1.cs with platform-specific attributes 2. NativeAOT tests → IsNativeAot or PlatformDoesNotSupportNativeTestAssets attributes 3. Mono-specific tests → IsMonoRuntime with architecture detection 4. Threading tests → IsThreadingSupported property All test exclusions are now inline, making them more discoverable and maintainable. Co-authored-by: jkoritzinsky <[email protected]>

Fixed build failures caused by missing 'using TestLibrary;' directives in 51 test files that reference typeof(PlatformDetection) or typeof(Utilities) in their ActiveIssue attributes. Files fixed: - GC tests: 2 files (Finalize2.cs, pluggaps.cs) - JIT/HardwareIntrinsics/X86/Sse41: 16 files - JIT/Performance/CodeQuality/BenchmarksGame: 6 files - Loader/classloader tests: 26 files - Regressions: 3 files All files now properly include the using directive after existing using statements, enabling them to compile successfully with the ActiveIssue attributes that were added during the migration. Co-authored-by: jkoritzinsky <[email protected]>

jkoritzinsky · 2026-01-17T01:10:02Z

@copilot some of the tests have mismatched XML tags for CrossGenTest. They have an end tag named Crossgen2. Please fix the start and end tags to both be CrossGenTest.

Fixed 6 project files where the XML closing tag </Crossgen2> was incorrectly used instead of </CrossGenTest>. Files fixed: - JIT/opt/ObjectStackAllocation/ObjectStackAllocationTests.csproj - JIT/Regression/JitBlue/DevDiv_255294/DevDiv_255294.csproj - Interop/IJW/NativeCallingManaged/NativeCallingManaged.csproj - Interop/IJW/NativeVarargs/NativeVarargsTest.csproj - Interop/IJW/ManagedCallingNative/ManagedCallingNative.csproj - Interop/IJW/CopyConstructorMarshaler/CopyConstructorMarshaler.csproj All files now correctly use <CrossGenTest>false</CrossGenTest> instead of <CrossGenTest>false</Crossgen2>. Co-authored-by: jkoritzinsky <[email protected]>

Copilot · 2026-01-17T01:15:35Z

@copilot some of the tests have mismatched XML tags for CrossGenTest. They have an end tag named Crossgen2. Please fix the start and end tags to both be CrossGenTest.

Fixed in 29fb62a. Corrected 6 project files where </Crossgen2> was incorrectly used as the closing tag instead of </CrossGenTest>.

jkoritzinsky · 2026-01-17T02:21:55Z

@copilot please fix these build failures:


/__w/1/s/src/tests/JIT/Directed/debugging/debuginfo/tester.cs(2,1): error CS0439: An extern alias declaration must precede all other elements defined in the namespace [/__w/1/s/src/tests/JIT/Directed/debugging/debuginfo/tester.csproj] [/__w/1/s/src/tests/build.proj]
/__w/1/s/src/tests/JIT/Directed/debugging/debuginfo/tester.cs(3,1): error CS0439: An extern alias declaration must precede all other elements defined in the namespace [/__w/1/s/src/tests/JIT/Directed/debugging/debuginfo/tester.csproj] [/__w/1/s/src/tests/build.proj]
/__w/1/s/src/tests/JIT/Generics/Instantiation/Structs/struct01.cs(7,7): error CS0246: The type or namespace name 'TestLibrary' could not be found (are you missing a using directive or an assembly reference?) [/__w/1/s/src/tests/JIT/Generics/Instantiation/Structs/struct01_Structs.csproj] [/__w/1/s/src/tests/build.proj]
/__w/1/s/src/tests/JIT/Generics/Instantiation/Structs/struct01.cs(64,43): error CS0246: The type or namespace name 'PlatformDetection' could not be found (are you missing a using directive or an assembly reference?) [/__w/1/s/src/tests/JIT/Generics/Instantiation/Structs/struct01_Structs.csproj] [/__w/1/s/src/tests/build.proj]
/__w/1/s/src/tests/JIT/Generics/Instantiation/Structs/struct01.cs(64,70): error CS0103: The name 'PlatformDetection' does not exist in the current context [/__w/1/s/src/tests/JIT/Generics/Instantiation/Structs/struct01_Structs.csproj] [/__w/1/s/src/tests/build.proj]
/__w/1/s/src/tests/JIT/jit64/rtchecks/overflow/overflow01_div.cs(6,7): error CS0246: The type or namespace name 'TestLibrary' could not be found (are you missing a using directive or an assembly reference?) [/__w/1/s/src/tests/JIT/jit64/rtchecks/rtchecks.csproj] [/__w/1/s/src/tests/build.proj]
/__w/1/s/src/tests/JIT/jit64/rtchecks/overflow/overflow02_div.cs(6,7): error CS0246: The type or namespace name 'TestLibrary' could not be found (are you missing a using directive or an assembly reference?) [/__w/1/s/src/tests/JIT/jit64/rtchecks/rtchecks.csproj] [/__w/1/s/src/tests/build.proj]
/__w/1/s/src/tests/JIT/jit64/rtchecks/overflow/overflow02_div.cs(99,41): error CS0246: The type or namespace name 'PlatformDetection' could not be found (are you missing a using directive or an assembly reference?) [/__w/1/s/src/tests/JIT/jit64/rtchecks/rtchecks.csproj] [/__w/1/s/src/tests/build.proj]
/__w/1/s/src/tests/JIT/jit64/rtchecks/overflow/overflow02_div.cs(99,68): error CS0103: The name 'PlatformDetection' does not exist in the current context [/__w/1/s/src/tests/JIT/jit64/rtchecks/rtchecks.csproj] [/__w/1/s/src/tests/build.proj]
/__w/1/s/src/tests/JIT/jit64/rtchecks/overflow/overflow02_div.cs(99,109): error CS0103: The name 'PlatformDetection' does not exist in the current context [/__w/1/s/src/tests/JIT/jit64/rtchecks/rtchecks.csproj] [/__w/1/s/src/tests/build.proj]
/__w/1/s/src/tests/JIT/jit64/rtchecks/overflow/overflow02_div.cs(99,151): error CS0103: The name 'PlatformDetection' does not exist in the current context [/__w/1/s/src/tests/JIT/jit64/rtchecks/rtchecks.csproj] [/__w/1/s/src/tests/build.proj]
/__w/1/s/src/tests/JIT/jit64/rtchecks/overflow/overflow01_div.cs(91,41): error CS0246: The type or namespace name 'PlatformDetection' could not be found (are you missing a using directive or an assembly reference?) [/__w/1/s/src/tests/JIT/jit64/rtchecks/rtchecks.csproj] [/__w/1/s/src/tests/build.proj]
/__w/1/s/src/tests/JIT/jit64/rtchecks/overflow/overflow01_div.cs(91,68): error CS0103: The name 'PlatformDetection' does not exist in the current context [/__w/1/s/src/tests/JIT/jit64/rtchecks/rtchecks.csproj] [/__w/1/s/src/tests/build.proj]
/__w/1/s/src/tests/JIT/jit64/rtchecks/overflow/overflow01_div.cs(91,109): error CS0103: The name 'PlatformDetection' does not exist in the current context [/__w/1/s/src/tests/JIT/jit64/rtchecks/rtchecks.csproj] [/__w/1/s/src/tests/build.proj]
/__w/1/s/src/tests/JIT/jit64/rtchecks/overflow/overflow01_div.cs(91,151): error CS0103: The name 'PlatformDetection' does not exist in the current context [/__w/1/s/src/tests/JIT/jit64/rtchecks/rtchecks.csproj] [/__w/1/s/src/tests/build.proj]

…erences Fixed 4 build errors: 1. tester.cs: Moved 'using TestLibrary;' after extern alias declarations (CS0439) 2. struct01_Structs.csproj: Added TestLibrary project reference 3. rtchecks.csproj: Added TestLibrary project reference for overflow test files In C#, extern alias declarations must come before all other elements, including using directives. Co-authored-by: jkoritzinsky <[email protected]>

Copilot · 2026-01-17T02:27:06Z

@copilot please fix these build failures:

Fixed in b0ae4fa.

Resolved:

CS0439 errors: Moved using TestLibrary; after extern alias declarations in tester.cs
CS0246 errors: Added missing <ProjectReference Include="$(TestLibraryProjectPath)" /> to struct01_Structs.csproj and rtchecks.csproj

jkoritzinsky and others added 2 commits January 15, 2026 18:11

Update TestPlatforms and PlatformDetection to contain all conditions …

b7f8099

…used in issues.targets

Initial plan

53714a6

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Add migration script for test exclusions from issues.targets

c2a1476

Co-authored-by: jkoritzinsky <[email protected]>

Improve migration script - handle SDK-style projects correctly

d8bdcaa

Co-authored-by: jkoritzinsky <[email protected]>

Add better summary statistics to migration script

0470790

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Copilot AI changed the title ~~[WIP] Replace test exclusions in issues.targets with defined attributes~~ Implement test exclusion migration from issues.targets to inline attributes Jan 16, 2026

Copilot AI requested a review from jkoritzinsky January 16, 2026 02:34

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src/tests/baseservices/finalization/CriticalFinalizer.csproj Show resolved Hide resolved

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Fix: Preserve XML comment in CriticalFinalizer.csproj

005eb34

Restored the "Needed for GC.WaitForPendingFinalizers" comment that was inadvertently removed. Co-authored-by: jkoritzinsky <[email protected]>

Clean up issues.targets - remove migrated exclusions

f26f59a

Removed 966 migrated ExcludeList items from issues.targets. Remaining 98 items are for tests without project files (CMake-based tests) that require manual migration. Co-authored-by: jkoritzinsky <[email protected]>

Copilot AI changed the title ~~Implement test exclusion migration from issues.targets to inline attributes~~ Complete test exclusion migration from issues.targets to inline attributes Jan 16, 2026

Copilot AI requested a review from jkoritzinsky January 16, 2026 02:51

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jkoritzinsky changed the base branch from issues-targets-to-attributes to main January 16, 2026 04:34

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Copilot started work on behalf of jkoritzinsky January 16, 2026 05:31 View session

Merge branch 'copilot/replace-test-exclusions' of github.com:dotnet/r…

cd41170

…untime into copilot/replace-test-exclusions

Copilot finished work on behalf of jkoritzinsky January 16, 2026 20:42

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Move another exclusion manually

08d7fb8

Copilot started work on behalf of jkoritzinsky January 16, 2026 22:15 View session

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jkoritzinsky added 3 commits January 16, 2026 14:58

Fix property name

4ff4272

Cleanup ActiveIssue attributes and fix threading suppression.

aa1c5d0

Add missing using

6cea6c4

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Migrate test exclusions from issues.targets to inline ActiveIssue attributes #123248

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Description

Changes

Example Migration

How to find tests for a given ExcludeList item

How to provide a replacement

Replacement Mapping Table

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