Daily Test Coverage Improver: Add comprehensive tests for Utils and DebugUtils

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Summary

This PR significantly improves test coverage by adding comprehensive tests for previously untested areas:

• DebugUtils.fs: Complete test coverage for debug logging functionality including environment variable handling, caching behavior, and exception handling
• Utils.fs: Extensive tests for ValueTask and Task utility extensions, including conversion methods, error handling, and edge cases
• Edge Cases: Added comprehensive boundary condition and error handling tests across the codebase

Test Coverage Improvements

New Test Files Added:

• TaskSeq.DebugUtils.Tests.fs - 15 test cases covering debug logging functionality
• TaskSeq.Utils.Tests.fs - 25 test cases covering utility functions and extensions
• TaskSeq.EdgeCases.Tests.fs - 30+ test cases covering boundary conditions and error scenarios

Key Areas Covered:

1. Debug Utilities:

   • Environment variable parsing with all valid values (1, true, on, yes, case-insensitive)
   • Caching behavior of verbose settings
   • Exception handling in environment variable access
   • Logging method variations

2. ValueTask Extensions:

   • ValueTask.False/True constants
   • fromResult, ofTask, ignore functions
   • Completed vs non-completed task handling
   • Obsolete method compatibility

3. Task Module Functions:

   • Task creation, transformation, and chaining operations
   • Conversion between Task, ValueTask, and Async types
   • Error propagation through map/bind operations

4. Boundary Conditions:

   • Null argument handling
   • Empty sequence operations
   • Negative index/count validation
   • Large sequence handling
   • Type casting edge cases
   • Cancellation token handling
   • Resource disposal scenarios

Testing Approach

Tests use reflection where necessary to access private methods (following F# testing best practices) and comprehensive error scenario coverage including:

• ArgumentNullException for null parameters
• ArgumentException for invalid arguments
• InvalidCastException for type conversion errors
• ObjectDisposedException for disposed resources
• TaskCanceledException for cancelled operations

All tests follow existing project conventions and use xUnit with FsUnit assertions.

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

[dsyme]

Closing as build/test was not configured