fix(tests): isolate databases in memory and reject persistent connections

tests/Support/InMemoryConnectionFactory.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Tests\Support;
+
+use Illuminate\Database\Connectors\ConnectionFactory;
+use RuntimeException;
+
+final class InMemoryConnectionFactory extends ConnectionFactory
+{
+    public static function assertSafe(array $config): void
+    {
+        // Reject URLs and alternate endpoints rather than trusting a database name.
+        if (($config['driver'] ?? null) !== 'sqlite'
+            || ($config['database'] ?? null) !== ':memory:'
+            || ! empty($config['url'])
+            || array_key_exists('read', $config)
+            || array_key_exists('write', $config)
+            || array_key_exists('direct', $config)) {
+            throw new RuntimeException(
+                'Unsafe test connection. Tests may only use SQLite :memory: without URLs or alternate endpoints.'
+            );
+        }
+    }
+
+    public function make(array $config, $name = null)
+    {
+        self::assertSafe($config);
+
+        return parent::make($config, $name);
+    }
+}