Expose get_config() on ModelTesters (#12812)

* Expose get_config() on ModelTesters

* Typo

tests/test_modeling_mpnet.py

@@ -16,7 +16,7 @@
 
 import unittest
 
-from transformers import is_torch_available
+from transformers import MPNetConfig, is_torch_available
 from transformers.testing_utils import require_torch, slow, torch_device
 
 from .test_configuration_common import ConfigTester
@@ -27,7 +27,6 @@ if is_torch_available():
     import torch
 
     from transformers import (
-        MPNetConfig,
         MPNetForMaskedLM,
         MPNetForMultipleChoice,
         MPNetForQuestionAnswering,
@@ -104,7 +103,11 @@ class MPNetModelTester:
             token_labels = ids_tensor([self.batch_size, self.seq_length], self.num_labels)
             choice_labels = ids_tensor([self.batch_size], self.num_choices)
 
-        config = MPNetConfig(
+        config = self.get_config()
+        return config, input_ids, input_mask, sequence_labels, token_labels, choice_labels
+
+    def get_config(self):
+        return MPNetConfig(
             vocab_size=self.vocab_size,
             hidden_size=self.hidden_size,
             num_hidden_layers=self.num_hidden_layers,
@@ -116,7 +119,6 @@ class MPNetModelTester:
             max_position_embeddings=self.max_position_embeddings,
             initializer_range=self.initializer_range,
         )
-        return config, input_ids, input_mask, sequence_labels, token_labels, choice_labels
 
     def create_and_check_mpnet_model(
         self, config, input_ids, input_mask, sequence_labels, token_labels, choice_labels