Daily Test Coverage Improver: Add comprehensive XML runtime tests

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Summary

Successfully implemented comprehensive test coverage for FSharp.Data.Xml.Core modules that were previously at 0% coverage, focusing on XML runtime functionality.

• Target areas: FSharp.Data.Runtime.BaseTypes.XmlElement and FSharp.Data.Runtime.XmlSchema
• Implementation: 16 comprehensive tests using reflection-based approach for generated-code-only methods
• Quality: All tests pass, no regressions, follows existing NUnit/FsUnit patterns

Coverage Improvements Achieved

Module-Level Improvements

• FSharp.Data.Runtime.BaseTypes.XmlElement: 0% → 100% coverage (+100 percentage points)
• FSharp.Data.Runtime.XmlSchema: 0% → 52.1% coverage (+52.1 percentage points)
• FSharp.Data.Xml.Core overall: 4.73% → 13.01% line coverage (+8.28 percentage points)
• Total project coverage: 73.69% → 74.17% line coverage (+0.48 percentage points)

Method Coverage

• XML.Core method coverage: 3.17% → 19.04% (+15.87 percentage points)
• Overall method coverage: 51.86% → 52.79% (+0.93 percentage points)

Technical Implementation

New Test Files

1. XmlRuntime.fs - 6 reflection-based tests covering:

   • XmlElement.Create methods (XElement and TextReader overloads)
   • XmlElement.CreateList functionality
   • XmlElement ToString and _Print property behavior
   • Edge cases: truncation, malformed XML handling

2. XmlSchema.fs - 10 tests covering:

   • Schema parsing from XSD text and TextReader
   • ResolutionFolderResolver URI handling
   • Error handling for invalid schemas
   • Complex schema processing

Testing Approach

• Reflection-based testing to access generated-code-only methods while respecting compiler constraints
• Comprehensive edge case coverage including error scenarios, malformed input, and boundary conditions
• Zero external dependencies for reliable CI/CD execution
• Framework compliance following existing NUnit/FsUnit patterns

Test Plan

Validation Steps

• ✅ All 2,728 tests pass (2,712 + 16 new tests)
• ✅ No regressions in existing functionality
• ✅ Coverage improvement verified with detailed before/after metrics
• ✅ Code formatting applied and linting clean
• ✅ Build successful in Release configuration

Coverage Verification Commands

# Generate coverage report
dotnet test tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj /p:CollectCoverage=true /p:CoverletOutputFormat=cobertura --configuration Release

# Generate HTML report
reportgenerator -reports:"tests/FSharp.Data.Core.Tests/TestResults/coverage.xml" -targetdir:"TestResults/CoverageReport" -reporttypes:"Html;Cobertura;TextSummary"

Future Opportunities

Based on the coverage analysis, the following areas remain high-priority targets:

1. ProviderImplementation.XmlInference (0%) - XML type inference engine
2. ProviderImplementation.XsdInference (0%) - XSD-based inference
3. FSharp.Data.Runtime.XmlRuntime (0%) - Core runtime operations
4. FSharp.Data.WorldBank.Core modules (multiple 0% areas)

This systematic approach demonstrates the effectiveness of targeting 0% coverage areas with comprehensive test coverage improvements.

Execution Log

Commands executed during implementation

Bash Commands

• dotnet tool restore - Restored .NET tools
• dotnet paket restore - Restored package dependencies
• dotnet build tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj --configuration Release - Built test project
• dotnet test tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj --configuration Release - Ran all tests
• dotnet test ...coverage... - Collected coverage data
• reportgenerator - Generated coverage reports
• dotnet run --project build/build.fsproj -- -t Format - Applied code formatting

File Operations

• Created tests/FSharp.Data.Core.Tests/XmlRuntime.fs
• Created tests/FSharp.Data.Core.Tests/XmlSchema.fs
• Modified tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj

Testing Strategy

• Analyzed existing coverage reports to identify 0% areas
• Researched generated-code constraints and reflection approaches
• Implemented comprehensive edge case testing
• Verified coverage improvements with detailed before/after metrics

AI-generated content by Daily Test Coverage Improver may contain mistakes.