reorder folders for easy 1:1 upload to boogie server

development-system/tests/booking-backend-config.test.php

@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+require __DIR__.'/../public/perspektivwerk/booking/backend.php';
+
+function expectSame(string $expected, string $actual, string $message): void
+{
+    if ($expected !== $actual) {
+        throw new RuntimeException($message."\nExpected: $expected\nActual: $actual");
+    }
+}
+
+$configFile = tempnam(sys_get_temp_dir(), 'sufw-booking-config-');
+if ($configFile === false) throw new RuntimeException('Temporary configuration file could not be created.');
+
+try {
+    file_put_contents($configFile, "<?php\nreturn ['database_url' => 'mysql://fallback:secret@database:3306/booking'];\n");
+
+    expectSame(
+        'mysql://fallback:secret@database:3306/booking',
+        bookingDatabaseUrl('', $configFile),
+        'The configuration file must be used when DATABASE_URL is empty.'
+    );
+    expectSame(
+        'mysql://environment:secret@database:3306/booking',
+        bookingDatabaseUrl('mysql://environment:secret@database:3306/booking', $configFile),
+        'DATABASE_URL must take precedence over the configuration file.'
+    );
+} finally {
+    unlink($configFile);
+}
+
+echo "booking backend configuration tests passed\n";