Refactor core test runtime and simplify project documentation

tests/Support/TestDatabaseFactory.php

@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Support;
+
+use PDO;
+
+/**
+ * Fabrique légère pour les bases SQLite de test.
+ */
+final class TestDatabaseFactory
+{
+    public static function createInMemory(): PDO
+    {
+        return new PDO('sqlite::memory:', options: [
+            PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+        ]);
+    }
+
+    public static function createFileBacked(string $name): PDO
+    {
+        $path = TestRuntimeFactory::path('database/' . $name . '.sqlite');
+        if (is_file($path)) {
+            @unlink($path);
+        }
+
+        return new PDO('sqlite:' . $path, options: [
+            PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+        ]);
+    }
+}