feat: improve unit tests

[Morgy93]

This pull request introduces a comprehensive set of improvements to the project's quality assurance and testing infrastructure. The main changes include the addition of extensive new unit tests for several core classes, as well as the enforcement of stricter code coverage requirements both locally and in CI. These updates will help ensure higher code quality and reliability as the codebase evolves.

Testing improvements:

• Added new unit tests for the following classes to improve test coverage and reliability:
  • FetchLatestVersionException (tests/Unit/Exception/FetchLatestVersionExceptionTest.php)
  • InspectorTheme (tests/Unit/Model/Config/Source/InspectorThemeTest.php)
  • ToolbarPosition (tests/Unit/Model/Config/Source/ToolbarPositionTest.php)
  • ThemeList (tests/Unit/Model/ThemeListTest.php)
  • ThemePath (tests/Unit/Model/ThemePathTest.php)
  • CacheCleaner (tests/Unit/Service/CacheCleanerTest.php)
  • DependencyChecker (tests/Unit/Service/DependencyCheckerTest.php)
  • GruntTaskRunner (tests/Unit/Service/GruntTaskRunnerTest.php)

Code coverage enforcement:

• Enforced a minimum code coverage threshold of 20% for line coverage in both local and CI runs by running tests/coverage-checker.php after the test suite, and only for full-suite runs locally. (.ddev/commands/web/phpunit, .github/workflows/phpunit.yml) [1] [2]
• Set a minimum Mutation Score Indicator (MSI) of 90% in infection.json5 to fail the run if mutation coverage drops below this floor, supporting a quality ratchet as the suite improves.

These changes together will help maintain and improve code quality by catching regressions early and providing better test coverage for critical components.

[Copilot]

Pull request overview

This PR strengthens MageForge’s QA setup by adding a broad set of new unit tests around core services/models and by introducing basic coverage/mutation-quality “ratchets” in local tooling and CI.

Changes:

• Added new PHPUnit unit tests for multiple services (theme building/cleaning, Hyvä scanning, node/grunt helpers) and supporting models/exceptions.
• Added a lightweight Clover line-coverage checker and wired it into CI and local ddev phpunit --coverage runs.
• Enforced a minimum covered MSI threshold in Infection configuration.

Reviewed changes

Copilot reviewed 24 out of 24 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/Unit/Service/ThemeSuggesterTest.php	New tests for ThemeSuggester suggestion logic and guards.
tests/Unit/Service/ThemeCleanerTest.php	New tests for ThemeCleaner deletion/dry-run/verbose behaviour.
tests/Unit/Service/ThemeBuilder/BuilderPoolTest.php	New tests for builder selection and pool behaviour.
tests/Unit/Service/ThemeBuilder/BuilderFactoryTest.php	New tests for builder registration and factory lookup/exception.
tests/Unit/Service/SymlinkCleanerTest.php	New tests for symlink removal behaviour in developer mode.
tests/Unit/Service/StaticContentDeployerTest.php	New tests for conditional static content deployment.
tests/Unit/Service/StaticContentCleanerTest.php	New tests for conditional pre-build cleaning behaviour.
tests/Unit/Service/StandardThemeBuilderTest.php	New tests for build orchestration and step tracking.
tests/Unit/Service/NodePackageManagerTest.php	New tests for npm install/ci and outdated package reporting.
tests/Unit/Service/Hyva/ModuleScannerTest.php	New tests for module scanning recursion/exclusions and metadata parsing.
tests/Unit/Service/Hyva/IncompatibilityDetectorTest.php	Expanded coverage for extension parsing and uppercase extension scanning.
tests/Unit/Service/Hyva/CompatibilityCheckerTest.php	New tests for summary aggregation and output formatting helpers.
tests/Unit/Service/GruntTaskRunnerTest.php	New tests for grunt execution/verbosity and error handling.
tests/Unit/Service/DependencyCheckerTest.php	New tests for dependency validation and prompt-driven remediation.
tests/Unit/Service/CacheCleanerTest.php	New tests for cache cleaning command execution and verbosity.
tests/Unit/Model/ThemePathTest.php	New tests for theme path resolution (frontend/adminhtml fallback).
tests/Unit/Model/ThemeListTest.php	New tests for theme list passthrough behaviour.
tests/Unit/Model/Config/Source/ToolbarPositionTest.php	New tests for toolbar position option source output.
tests/Unit/Model/Config/Source/InspectorThemeTest.php	New tests for inspector theme option source output.
tests/Unit/Exception/FetchLatestVersionExceptionTest.php	New tests for exception inheritance/message behaviour.
tests/coverage-checker.php	New script to fail builds when Clover line coverage drops below a threshold.
infection.json5	Added minCoveredMsi threshold to enforce mutation-quality floor.
.github/workflows/phpunit.yml	CI step added to enforce minimum line coverage when coverage is enabled.
.ddev/commands/web/phpunit	Local coverage runs now invoke the coverage checker (full-suite only).