chore: increase the amount of unit testing

[glennawatson]

This pull request makes two main changes to the ReactiveUI.Binding source generators: it updates the generated binding code to use RxBindingExtensions instead of ObservableExtensions for observable operations, and it ensures that generated binding classes are excluded from code coverage analysis. These changes help with code clarity, maintainability, and test reporting.

Generated code improvements:

• All generated binding code now uses global::ReactiveUI.Binding.Observables.RxBindingExtensions instead of ObservableExtensions for observable operations such as Select, Subscribe, Skip, Merge, Switch, and DistinctUntilChanged in the source generator output. This affects the code generation for one-way, two-way, and observation bindings. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18]

Code coverage improvements:

• Adds the [ExcludeFromCodeCoverage] attribute to the ReactiveSchedulerExtensions class and to a new generated partial class __ReactiveUIGeneratedBindings, ensuring that generated binding code is not included in code coverage metrics. [1] [2]

[codecov]

Codecov Report

❌ Patch coverage is 97.50000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.82%. Comparing base (010024f) to head (35602de).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...veUI.Binding.SourceGenerators/MetadataExtractor.cs	92.00%	0 Missing and 2 partials ⚠️
...tiveUI.Binding/Builder/ReactiveUIBindingBuilder.cs	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #5       +/-   ##
===========================================
+ Coverage   55.51%   97.82%   +42.30%     
===========================================
  Files         180      164       -16     
  Lines        8410     5556     -2854     
  Branches     1377      995      -382     
===========================================
+ Hits         4669     5435      +766     
+ Misses       3324       30     -3294     
+ Partials      417       91      -326     

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[Copilot]

Pull request overview

This pull request significantly increases unit test coverage for the ReactiveUI.Binding library by adding comprehensive tests for type converters and updating the testing infrastructure. The changes focus on testing the binding framework's type conversion capabilities while ensuring that generated code is properly excluded from code coverage analysis.

Changes:

• Added unit tests for 14 type converter classes covering DateTime, DateTimeOffset, DateOnly, TimeOnly, TimeSpan, Guid, Boolean, and Double conversions
• Refactored test assembly initialization from ModuleInitializer to [Before(Assembly)] pattern
• Updated generated code to exclude from code coverage via [ExcludeFromCodeCoverage] attribute

Reviewed changes

Copilot reviewed 300 out of 386 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
StringToDateTimeTypeConverterTests.cs	Tests string-to-DateTime conversion scenarios
StringToDateTimeOffsetTypeConverterTests.cs	Tests string-to-DateTimeOffset conversion scenarios
StringToDateOnlyTypeConverterTests.cs	Tests string-to-DateOnly conversion for .NET 6+
NullableTimeSpanToStringTypeConverterTests.cs	Tests nullable TimeSpan-to-string conversion
NullableTimeOnlyToStringTypeConverterTests.cs	Tests nullable TimeOnly-to-string conversion for .NET 6+
NullableGuidToStringTypeConverterTests.cs	Tests nullable Guid-to-string conversion
NullableDoubleToDoubleTypeConverterTests.cs	Tests nullable double-to-double conversion
NullableDateTimeToStringTypeConverterTests.cs	Tests nullable DateTime-to-string conversion
NullableDateTimeOffsetToStringTypeConverterTests.cs	Tests nullable DateTimeOffset-to-string conversion
NullableDateOnlyToStringTypeConverterTests.cs	Tests nullable DateOnly-to-string conversion for .NET 6+
NullableBooleanToStringTypeConverterTests.cs	Tests nullable boolean-to-string conversion
GuidToStringTypeConverterTests.cs	Tests Guid-to-string conversion
DoubleToNullableDoubleTypeConverterTests.cs	Tests double-to-nullable double conversion
DateTimeToStringTypeConverterTests.cs	Tests DateTime-to-string conversion
DateTimeOffsetToStringTypeConverterTests.cs	Tests DateTimeOffset-to-string conversion
DateOnlyToStringTypeConverterTests.cs	Tests DateOnly-to-string conversion for .NET 6+
BooleanToStringTypeConverterTests.cs	Tests boolean-to-string conversion
AssemblySetup.cs (multiple files)	Refactored test initialization to use [Before(Assembly)]
RxBindingExtensions.cs	Renamed from ObservableExtensions and added code coverage exclusion
BindingGenerator.cs	Added [ExcludeFromCodeCoverage] attribute generation for generated bindings
Various generator tests	Updated verified snapshots to include [ExcludeFromCodeCoverage] attribute

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[RLittlesII]

LGTM!