add macroable trait to database factory

src/Illuminate/Database/Eloquent/Factories/Factory.php

@@ -11,11 +11,14 @@
 use Illuminate\Support\Collection;
 use Illuminate\Support\Str;
 use Illuminate\Support\Traits\ForwardsCalls;
+use Illuminate\Support\Traits\Macroable;
 use Throwable;
 
 abstract class Factory
 {
-    use ForwardsCalls;
+    use ForwardsCalls, Macroable {
+        __call as macroCall;
+    }
 
     /**
      * The name of the factory's corresponding model.
@@ -747,6 +750,10 @@ protected static function appNamespace()
      */
     public function __call($method, $parameters)
     {
+        if (static::hasMacro($method)) {
+            return $this->macroCall($method, $parameters);
+        }
+
         if (! Str::startsWith($method, ['for', 'has'])) {
             static::throwBadMethodCallException($method);
         }

tests/Database/DatabaseEloquentFactoryTest.php

@@ -473,6 +473,16 @@ public function test_dynamic_has_and_for_methods()
         $this->assertCount(2, $post->comments);
     }
 
+    public function test_can_be_macroable()
+    {
+        $factory = FactoryTestUserFactory::new();
+        $factory->macro('getFoo', function () {
+            return 'Hello World';
+        });
+
+        $this->assertEquals('Hello World', $factory->getFoo());
+    }
+
     /**
      * Get a database connection instance.
      *