Expose get_config() on ModelTesters (#12812)

* Expose get_config() on ModelTesters

* Typo

tests/test_modeling_dpr.py

@@ -16,7 +16,7 @@
 
 import unittest
 
-from transformers import is_torch_available
+from transformers import DPRConfig, is_torch_available
 from transformers.testing_utils import require_torch, slow, torch_device
 
 from .test_configuration_common import ConfigTester
@@ -26,7 +26,7 @@ from .test_modeling_common import ModelTesterMixin, ids_tensor, random_attention
 if is_torch_available():
     import torch
 
-    from transformers import DPRConfig, DPRContextEncoder, DPRQuestionEncoder, DPRReader, DPRReaderTokenizer
+    from transformers import DPRContextEncoder, DPRQuestionEncoder, DPRReader, DPRReaderTokenizer
     from transformers.models.dpr.modeling_dpr import (
         DPR_CONTEXT_ENCODER_PRETRAINED_MODEL_ARCHIVE_LIST,
         DPR_QUESTION_ENCODER_PRETRAINED_MODEL_ARCHIVE_LIST,
@@ -104,7 +104,12 @@ class DPRModelTester:
             token_labels = ids_tensor([self.batch_size, self.seq_length], self.num_labels)
             choice_labels = ids_tensor([self.batch_size], self.num_choices)
 
-        config = DPRConfig(
+        config = self.get_config()
+
+        return config, input_ids, token_type_ids, input_mask, sequence_labels, token_labels, choice_labels
+
+    def get_config(self):
+        return DPRConfig(
             projection_dim=self.projection_dim,
             vocab_size=self.vocab_size,
             hidden_size=self.hidden_size,
@@ -119,8 +124,6 @@ class DPRModelTester:
             initializer_range=self.initializer_range,
         )
 
-        return config, input_ids, token_type_ids, input_mask, sequence_labels, token_labels, choice_labels
-
     def create_and_check_context_encoder(
         self, config, input_ids, token_type_ids, input_mask, sequence_labels, token_labels, choice_labels
     ):