test: isolate PHPUnit database

phpunit.xml

@@ -19,6 +19,7 @@
     </source>
     <php>
         <env name="APP_ENV" value="testing"/>
+        <env name="DB_DATABASE" value="shopit_test" force="true"/>
         <env name="APP_MAINTENANCE_DRIVER" value="file"/>
         <env name="APP_CONFIG_CACHE" value="bootstrap/cache/phpunit-config.php"/>
         <env name="APP_EVENTS_CACHE" value="bootstrap/cache/phpunit-events.php"/>

tests/TestCase.php

@@ -2,9 +2,25 @@
 
 namespace Tests;
 
+use Illuminate\Foundation\Application;
 use Illuminate\Foundation\Testing\TestCase as BaseTestCase;
+use RuntimeException;
 
 abstract class TestCase extends BaseTestCase
 {
-    //
+    public function createApplication(): Application
+    {
+        $app = parent::createApplication();
+        $connection = (string) $app['config']->get('database.default');
+        $database = (string) $app['config']->get("database.connections.{$connection}.database");
+        $usesInMemorySqlite = $connection === 'sqlite' && $database === ':memory:';
+
+        if (! $usesInMemorySqlite && ! str_ends_with(strtolower($database), '_test')) {
+            throw new RuntimeException(
+                "Unsafe test database [{$database}]. Tests may only use an in-memory SQLite database or a database ending in _test.",
+            );
+        }
+
+        return $app;
+    }
 }