Add more models to common tests (#4910)

tests/test_modeling_roberta.py

@@ -29,10 +29,12 @@ if is_torch_available():
         RobertaConfig,
         RobertaModel,
         RobertaForMaskedLM,
+        RobertaForMultipleChoice,
+        RobertaForQuestionAnswering,
         RobertaForSequenceClassification,
         RobertaForTokenClassification,
     )
-    from transformers.modeling_roberta import RobertaEmbeddings, RobertaForMultipleChoice, RobertaForQuestionAnswering
+    from transformers.modeling_roberta import RobertaEmbeddings
     from transformers.modeling_roberta import ROBERTA_PRETRAINED_MODEL_ARCHIVE_LIST
     from transformers.modeling_utils import create_position_ids_from_input_ids
 
@@ -40,7 +42,18 @@ if is_torch_available():
 @require_torch
 class RobertaModelTest(ModelTesterMixin, unittest.TestCase):
 
-    all_model_classes = (RobertaForMaskedLM, RobertaModel) if is_torch_available() else ()
+    all_model_classes = (
+        (
+            RobertaForMaskedLM,
+            RobertaModel,
+            RobertaForSequenceClassification,
+            RobertaForTokenClassification,
+            RobertaForMultipleChoice,
+            RobertaForQuestionAnswering,
+        )
+        if is_torch_available()
+        else ()
+    )
 
     class RobertaModelTester(object):
         def __init__(