make it standalone

Author: awaelchli

tests/tests_pytorch/trainer/properties/test_estimated_stepping_batches.py

@@ -148,7 +148,7 @@ def on_train_start(self):
         assert self.trainer.estimated_stepping_batches == len(self.train_dataloader()) // 8
 
 
-@RunIf(tpu=True)
+@RunIf(tpu=True, standalone=True)
 def test_num_stepping_batches_with_tpu_multi():
     """Test stepping batches with the TPU strategy across multiple devices."""
     trainer = Trainer(accelerator="tpu", devices=8, max_epochs=1)