chore(deps): replace illuminate/testing with orchestra/testbench

Adds orchestra/testbench as the dev dependency for Laravel integration
tests. Laravel framework (pulled in transitively) already provides the
TestResponse class previously sourced from illuminate/testing, so the
former dev dep is removed.

The namespace-level config() mock used by unit tests now delegates to
the real framework helper when a Laravel app is bootstrapped (via
testbench), so integration tests see actual config values instead of
the empty $GLOBALS stub.

Author: wadakatu

composer.json

@@ -11,7 +11,7 @@
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3.94",
-        "illuminate/testing": "^11.0 || ^12.0",
+        "orchestra/testbench": "^9.0 || ^10.0 || ^11.0",
         "phpstan/phpstan": "^2.0",
         "symfony/http-foundation": "^6.4 || ^7.0 || ^8.0"
     },

tests/Helpers/LaravelConfigMock.php

@@ -4,6 +4,11 @@
 
 namespace Studio\OpenApiContractTesting\Laravel;
 
+use Throwable;
+
+use function array_key_exists;
+use function function_exists;
+
 /**
  * Namespace-level config() mock for unit testing.
  *
@@ -21,9 +26,33 @@
  * in ValidatesOpenApiSchema.php (i.e., no "use function config" import).
  * Adding such an import would bypass namespace resolution and break this mock.
  *
- * Test values are read from $GLOBALS['__openapi_testing_config'].
+ * Resolution order:
+ * 1. A unit-test override in $GLOBALS['__openapi_testing_config'] wins — unit
+ *    tests set this explicitly to control what the trait sees.
+ * 2. Otherwise, defer to the real framework helper when an app is running
+ *    (integration tests using orchestra/testbench). The global helper is
+ *    invoked via a variable function to bypass both PHP namespace resolution
+ *    (which would recurse into this mock) and cs-fixer's global_namespace_import
+ *    rule (which would strip a leading backslash and break the call).
  */
 function config(string $key, mixed $default = null): mixed
 {
-    return $GLOBALS['__openapi_testing_config'][$key] ?? $default;
+    if (
+        isset($GLOBALS['__openapi_testing_config']) &&
+        array_key_exists($key, $GLOBALS['__openapi_testing_config'])
+    ) {
+        return $GLOBALS['__openapi_testing_config'][$key];
+    }
+
+    if (function_exists('config')) {
+        $globalConfig = 'config';
+
+        try {
+            return $globalConfig($key, $default);
+        } catch (Throwable) {
+            return $default;
+        }
+    }
+
+    return $default;
 }