Refactor core test runtime and simplify project documentation

tests/Kernel/MigratorTest.php

@@ -5,8 +5,8 @@ declare(strict_types=1);
 namespace Tests\Kernel;
 
 use Netig\Netslim\Kernel\Persistence\Infrastructure\Migrator;
-use PDO;
 use PHPUnit\Framework\TestCase;
+use Tests\Support\TestDatabaseFactory;
 
 /**
  * Tests unitaires pour Migrator.
@@ -18,14 +18,11 @@ use PHPUnit\Framework\TestCase;
 #[\PHPUnit\Framework\Attributes\AllowMockObjectsWithoutExpectations]
 final class MigratorTest extends TestCase
 {
-    private PDO $db;
+    private \PDO $db;
 
     protected function setUp(): void
     {
-        $this->db = new PDO('sqlite::memory:', options: [
-            PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
-            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
-        ]);
+        $this->db = TestDatabaseFactory::createInMemory();
     }
 
     public function testRunCreatesMigrationsTable(): void