Add comprehensive test suite with 100% code coverage

[HecFranco]

Summary

Expands the PHPUnit suite to 175 tests with 100% line and method coverage locally (~40% before). Adds coverage for commands, finders, node visitors, smoke test generation, and testing utilities.

All Code Analysis checks pass on PHP 8.4 (PHPUnit, PHPStan level 8, Rector, ECS, composer-dependency-analyser, etc.).

What changed

Tests

• Command tests for all CLI commands (pretty-json, finalize-classes, privatize-constants, search-regex, smoke test generation, …)
• Tests for FilesFinder, PhpParser node visitors, MockedClassResolver, TraitSpotter, value objects, and related services
• Command integration fixtures (including empty-dir for pretty-json)
• Test fixtures use local attributes instead of Doctrine (keeps composer-dependency-analyser green)

PHPUnit configuration

• phpunit.xml — tests only (CI runs vendor/bin/phpunit with coverage: none)
• phpunit.coverage.xml — coverage reports for local runs

Minor src/ adjustments (edge cases exposed by coverage)

• FilesFinder::findJsonFiles() — skip empty directory lists before iterating Finder
• Node visitors — safer handling when namespacedName is missing
• MockWire — Assert::classExists() before PHPUnit mocker creation
• ContainerFactory — autodiscover Testing/Command
• KernelTestCase stub — extends PHPUnit\Framework\TestCase

Local development (optional)

• Docker (PHP 8.4): docker/test.sh, docker/coverage.sh

Coverage

Metric	Before (approx.)	After (local)
Lines	~40%	100%
Methods	—	100%
Tests	~41	175

vendor/bin/phpunit --configuration phpunit.coverage.xml

Test plan

• vendor/bin/phpunit — 175 tests, all passing
• composer phpstan — level 8, no errors
• vendor/bin/composer-dependency-analyser — no issues
• CI on PHP 8.4 — all Code Analysis jobs green
• Coverage 100% lines/methods (local, via phpunit.coverage.xml)

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Optional comment

CI is green on PHP 8.4. Coverage config is split into phpunit.coverage.xml so CI can run without pcov/xdebug. Test fixtures no longer reference Doctrine classes.

[HecFranco]

Hi @TomasVotruba 👋

Thank you for reviewing and merging #131 — glad the Entropy console migration is in main now.

I've opened a follow-up PR that expands the PHPUnit suite to 100% line and method coverage (175 tests, up from ~40%). It adds tests for commands, finders, node visitors, and smoke test generation, plus a few small edge-case fixes in src/ where coverage uncovered unreachable or untested branches.

Would you have time to take a look when you get a chance? Happy to adjust anything if you'd prefer a smaller scope (e.g. tests only, without the Docker setup).

Thanks again for the merge on the previous one!