Fixed test case generation in cases of unfulfillable demands

[TonyTroeff]

Pull Request Description

If there are unfulfillable demands, no test cases will be generated. Everything else should work as expected.

Motivation and Context

This PR fixes #86.

Checklist

• I have tested these changes thoroughly.
• I have added/updated relevant documentation.
• My code follows the project's coding guidelines.
• I have performed a self-review of my changes.
• My changes are backwards compatible.

[Copilot]

Pull request overview

Fixes test discovery so that when requirements exist but no utilities remain after applying demands, no test cases are generated/discovered (addresses #86).

Changes:

• Added the ability to register an initialization category with zero values (Register(category)), and updated collection construction sites to use it.
• Updated discovery/assembly-data/serialization/dependency-building paths to ensure required categories are present even when filtered to empty.
• Added unit tests covering “no test cases when all required utilities are filtered out” and “single test case when nothing is required”.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
TryAtSoftware.CleanTests.Core/XUnit/Serialization/SerializableInitializationUtility.cs	Ensures demand categories are registered before adding demand entries during deserialization.
TryAtSoftware.CleanTests.Core/XUnit/Discovery/CleanTestFrameworkDiscoverer.cs	Registers required categories even if no matching utilities exist, preventing combinations/testcases from being generated.
TryAtSoftware.CleanTests.Core/XUnit/CleanTestAssemblyData.cs	Registers utility categories explicitly before registering utilities.
TryAtSoftware.CleanTests.Core/Interfaces/ICleanTestInitializationCollection.cs	Adds Register(string category) to support empty-category registration.
TryAtSoftware.CleanTests.Core/Extensions/CleanTestsFrameworkExtensions.cs	Ensures categories are registered before copying/registering values; registers demand categories when extracting demands.
TryAtSoftware.CleanTests.Core/Construction/ConstructionManager.cs	Registers dependency categories before adding dependencies.
TryAtSoftware.CleanTests.Core/CleanTestInitializationCollection.cs	Implements Register(category); adjusts Register(category, value) behavior accordingly.
Tests/TryAtSoftware.CleanTests.UnitTests/Parametrization/EnvironmentSetup.cs	Updates test setup helpers to register categories before adding per-category values.
Tests/TryAtSoftware.CleanTests.UnitTests/CleanUtilitiesDistributionTests.cs	Adds regression tests for discovery behavior when demands filter out all required utilities.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud