Daily Test Coverage Improver: Comprehensive TextConversions test coverage

[github-actions]

Summary

Significantly improved TextConversions test coverage in FSharp.Data.Runtime.Utilities with 14 new comprehensive test methods:

• Test count: 2,268 → 2,282 tests (+14 new tests)
• All 2,282 tests passing: ✅
• Build status: ✅ No compilation errors
• Code formatting: ✅ Fantomas validation passed

Problems Found

Comprehensive analysis revealed major gaps in TextConversions test coverage:

• TextConversions module had only 4 basic tests covering minimal functionality
• Critical conversion methods were completely untested: AsInteger, AsInteger64, AsTimeSpan, AsGuid, enhanced AsString
• Missing values handling and currency adorner removal had zero validation coverage
• Edge cases were uncovered: scientific notation, special float values (Infinity/NaN), malformed input scenarios
• No validation of whitespace handling, format variations, or boundary conditions

Actions Taken

Added 14 comprehensive test methods covering previously untested functionality:

🔢 Enhanced Numeric Conversions

• Integer & Integer64: Boundary values, currency adorner removal ($€¥£₹), non-currency adorners (%‰‱)
• Decimal: Various formats (.5, 1000.00), percentage notation, invalid format detection
• Float with Missing Values: Scientific notation (1.23e10, 1.23e-5), special values (Infinity, -Infinity, NaN), comprehensive missing values array validation

📅 Enhanced DateTime Handling

• DateTime: Additional format support, Microsoft JSON date format (/Date(timestamp)/), malformed date validation
• DateTimeOffset: Various timezone formats, invalid input handling
• TimeSpan: Standard time formats, days.hours:minutes:seconds format, validation of invalid inputs

🔧 New Conversion Methods Coverage

• Guid: Multiple format support ({}, (), standard, no-dashes), case insensitivity, whitespace trimming
• String: Option type behavior validation, null/empty/whitespace handling
• Boolean: Enhanced whitespace handling, additional valid formats (YES/NO, TRUE/FALSE variations)

🧪 Edge Cases & Validation

• Comprehensive currency symbol removal testing across all numeric types
• Default missing values array validation for all standard missing indicators
• Whitespace and special character handling across all conversion methods
• Empty string and null input validation with proper None/Some behavior

Test Quality & Coverage Impact

All 14 new tests demonstrate:

• ✅ Comprehensive edge case coverage including malformed input, boundary conditions, and special values
• ✅ Proper error handling validation using NUnit Assert patterns and FsUnit should syntax
• ✅ Real-world scenario testing with currency symbols, scientific notation, and timezone handling
• ✅ F# coding conventions following existing test patterns and project structure
• ✅ Zero regression impact - all existing 2,268 tests continue to pass

This addresses the FSharp.Data.Runtime.Utilities module identified in the research analysis as having ~50% coverage, focusing specifically on the TextConversions component which is critical for data parsing throughout the FSharp.Data library ecosystem.

Future Areas for Improvement

Based on coverage analysis, next opportunities include:

• FSharp.Data.Http: HTTP client functionality and error handling scenarios
• FSharp.Data.Runtime.Utilities: IO module URI resolution and file handling
• HTML parsing modules: Complex selector scenarios and malformed HTML handling
• XML inference: Schema validation and namespace handling edge cases

Validation

• ✅ All 14 new tests pass successfully with comprehensive coverage
• ✅ All 2,282 total tests continue to pass (zero regressions)
• ✅ Build succeeds without warnings or errors
• ✅ Code formatting validation passes (Fantomas)
• ✅ Follows F# testing conventions and project patterns

Commands Executed

Bash commands:

• git checkout -b daily-test-improver/textconversions-coverage
• dotnet build tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj --configuration Release
• dotnet test tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj --filter "FullyQualifiedName~Conversions" --configuration Release
• dotnet test tests/FSharp.Data.Core.Tests/FSharp.Data.Core.Tests.fsproj --configuration Release
• dotnet run --project build/build.fsproj -- -t Format
• git add ... && git commit ... && git push ...

MCP Functions:

• mcp__github__search_issues - Located research issue Daily Test Coverage Improver: Research and Plan #1548
• mcp__github__get_issue_comments - Read previous coverage work and maintainer feedback
• mcp__github__search_pull_requests - Reviewed recent coverage improvements to avoid duplication
• File operations: Read, Edit for comprehensive test implementation and source code analysis

Web Searches: None performed
Web Pages Fetched: None

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