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Fixes #3723

@claude
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claude bot commented Nov 8, 2025

Claude finished @thomhurst's task —— View job


Pull Request Review

I've completed my review of this PR that fixes StateBag item propagation from TestBuilderContext to TestContext (#3723). Here's my comprehensive feedback:

Code Quality & Best Practices

Strengths:

  • Clean implementation following TUnit's coding conventions
  • Proper use of C# modern features (file-scoped namespaces, collection expressions where appropriate)
  • Good naming consistency using StateBag terminology throughout
  • Proper deprecation pattern with [Obsolete] for the old ObjectBag property

Minor Issues:

  • Line 60 in TestBuilderContext.cs:60 could benefit from line breaks for better readability:
// Current (hard to read):
Events = testContext.InternalEvents, TestMetadata = testContext.Metadata.TestDetails.MethodMetadata, DataSourceAttribute = dataSourceAttribute, StateBag = testContext.StateBag.Items,

// Suggested:
Events = testContext.InternalEvents,
TestMetadata = testContext.Metadata.TestDetails.MethodMetadata, 
DataSourceAttribute = dataSourceAttribute,
StateBag = testContext.StateBag.Items

Dual-Mode Implementation Compliance

The fix properly handles both execution modes:

  1. Source Generator Mode: Changes to TestBuilderContext ensure StateBag items are preserved during code generation
  2. Reflection Mode: TestBuilder.cs:395 properly passes contextAccessor.Current.StateBag to maintain state

This correctly follows TUnit's Rule 1 for dual-mode parity.

Test Coverage

Excellent test coverage with TUnit.TestProject/Bugs/3723/Tests.cs:

  • Tests StateBag data flow from ClassConstructor to TestContext ✅
  • Tests isolation between multiple test instances ✅
  • Uses [EngineTest(ExpectedResult.Pass)] for proper validation ✅

The test design effectively validates the core requirement: data set in ClassConstructor should be accessible in test methods via TestContext.Current.StateBag.

Performance Considerations

Good:

  • No new allocations introduced in hot paths
  • Reuses existing ConcurrentDictionary<string, object?> instances
  • Maintains reference sharing rather than copying data

Potential Concern:

  • StateBag sharing between contexts could theoretically lead to contention, but this is the intended behavior for state propagation

Security & Safety

  • No security concerns identified
  • Proper use of ConcurrentDictionary for thread safety
  • Maintains existing access patterns without introducing vulnerabilities

API Changes & Snapshots

Public API changes are minimal and appropriate:

  • Added StateBag property to TestBuilderContext
  • Properly updated snapshot tests across all .NET versions
  • Maintains backward compatibility with obsolete ObjectBag property

🔧 Architecture Correctness

The fix addresses the root cause correctly:

  1. Problem: StateBag items set in ClassConstructor weren't flowing to TestContext
  2. Root Cause: TestBuilder.cs was creating new StateBag instances instead of reusing existing ones
  3. Solution: Line 395 now uses contextAccessor.Current.StateBag to maintain reference continuity

The data flow is now correct:

ClassConstructor.StateBag → TestBuilderContext.StateBag → TestContext.StateBag

⚠️ Minor Recommendations

  1. Code Style: Break up the long property initialization in TestBuilderContext.cs:60
  2. Documentation: Consider adding a code comment explaining the StateBag flow in critical sections
  3. Consistency: Ensure all StateBag assignments follow the same pattern throughout the codebase

📊 Overall Assessment

This is a high-quality fix that:

  • ✅ Solves the reported issue correctly
  • ✅ Follows TUnit's architectural patterns
  • ✅ Maintains dual-mode compatibility
  • ✅ Includes comprehensive tests
  • ✅ Has no performance or security concerns
  • ✅ Properly updates public API snapshots

Recommendation: ✅ APPROVE - This PR is ready to merge after addressing the minor formatting suggestion.

@thomhurst thomhurst merged commit 9677384 into main Nov 8, 2025
12 of 13 checks passed
@thomhurst thomhurst deleted the bug/3723 branch November 8, 2025 00:40
@claude claude bot mentioned this pull request Nov 8, 2025
1 task
This was referenced Nov 8, 2025
This was referenced Nov 10, 2025
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Successfully merging this pull request may close these issues.

Regression: TestBuilderContext.ObjectBag no longer works, again

2 participants