test(integration): cover query failure state cleanup

tests/Integration/ModelTransactionTest.php

@@ -69,6 +69,10 @@ final class ModelTransactionTest extends TestCase
         User::beginTransaction();
         $user = self::seed('wrecked_carol');
 
+        // Dirty the builder BEFORE failing: only a leftover-free result after
+        // the exception proves query() itself cleaned up (finding F2).
+        User::where('age', '>', '30');
+
         try {
             (new ReflectionMethod(User::class, 'query'))
                 ->invokeArgs(null, ['SELECT * FROM table_that_does_not_exist']);
@@ -78,6 +82,14 @@ final class ModelTransactionTest extends TestCase
         }
 
         $this->assertFalse(self::db()->inTransaction(), 'the exception path must close the transaction');
+
+        $sqlAfterFailure = (new ReflectionMethod(User::class, 'buildQuery'))->invoke(null);
+        $this->assertSame(
+            'SELECT * FROM users',
+            $sqlAfterFailure,
+            'a failed query must leave the builder at its default state'
+        );
+
         $this->assertNull(User::where('username', 'wrecked_carol')->getFirst(), 'pending insert must be undone');
     }
 }