Daily Test Coverage Improver: Add comprehensive XmlInference module tests

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Summary

This automated pull request improves test coverage for the XmlInference module as part of the Daily Test Coverage Improver workflow.

Coverage Improvement

• Target Module: ProviderImplementation.XmlInference
• Previous Coverage: 0.0%
• New Coverage: 95.2%
• Coverage Increase: +95.2 percentage points

Changes Made

• ✅ Created comprehensive test suite in tests/FSharp.Data.Core.Tests/XmlInference.fs
• ✅ Added 25 test methods covering all major XmlInference functionality
• ✅ Added project reference to FSharp.Data.DesignTime for provider access
• ✅ Implemented custom IUnitsOfMeasureProvider for testing
• ✅ All tests passing (2,737 total tests, zero regressions)

Test Categories

1. Value Type Inference Tests - Testing getInferedTypeFromValue with various data types:

   • String values
   • Numeric values (int, decimal, int64)
   • Boolean values
   • Empty elements

2. JSON Integration Tests - Testing embedded JSON detection:

   • JSON objects in XML content
   • JSON arrays in XML content
   • Malformed JSON handling
   • NoInference mode behavior

3. Local Type Inference Tests - Testing inferLocalType functionality:

   • Simple elements with content
   • Elements with attributes
   • Elements with child elements
   • Empty elements
   • Attribute-only elements
   • Complex nested structures

4. Global Type Inference Tests - Testing inferGlobalType and inferType:

   • Single element inference
   • Multiple elements of same type
   • Global vs local inference modes
   • Multiple root elements

5. Real-world Scenarios - Complex XML structures:

   • Library with books (nested elements with attributes)
   • Mixed content types (numbers, text, booleans, decimals)
   • Namespaced XML elements
   • Large integer values

Technical Implementation

• Uses NUnit testing framework with FsUnit assertions
• Follows existing test patterns from InferenceTests.fs
• Implements proper test infrastructure for type provider testing
• Comprehensive edge case coverage including error conditions

Test Results

• Total Tests: 2,737 (increased from 2,712)
• New Tests Added: 25
• Test Status: All passing ✅
• Code Formatting: Applied and verified ✅

Automation Context

This PR was automatically generated by the Daily Test Coverage Improver workflow, targeting zero-coverage modules in the FSharp.Data codebase. The XmlInference module is critical for XML type provider functionality and previously had no test coverage.

Related: Issue #1574 (Test coverage research and analysis)

🤖 Generated with Claude Code