[tests] fix audioldm2 tests.

src/diffusers/pipelines/audioldm2/pipeline_audioldm2.py

@@ -324,17 +324,18 @@ def generate_language_model(
             `inputs_embeds (`torch.Tensor` of shape `(batch_size, sequence_length, hidden_size)`):
                 The sequence of generated hidden-states.
         """
-        cache_position_kwargs = {}
-        if is_transformers_version("<", "4.52.1"):
-            cache_position_kwargs["input_ids"] = inputs_embeds
-        else:
-            cache_position_kwargs["seq_length"] = inputs_embeds.shape[0]
-            cache_position_kwargs["device"] = (
-                self.language_model.device if getattr(self, "language_model", None) is not None else self.device
-            )
-        cache_position_kwargs["model_kwargs"] = model_kwargs
         max_new_tokens = max_new_tokens if max_new_tokens is not None else self.language_model.config.max_new_tokens
-        model_kwargs = self.language_model._get_initial_cache_position(**cache_position_kwargs)
+        if hasattr(self.language_model, "_get_initial_cache_position"):
+            cache_position_kwargs = {}
+            if is_transformers_version("<", "4.52.1"):
+                cache_position_kwargs["input_ids"] = inputs_embeds
+            else:
+                cache_position_kwargs["seq_length"] = inputs_embeds.shape[0]
+                cache_position_kwargs["device"] = (
+                    self.language_model.device if getattr(self, "language_model", None) is not None else self.device
+                )
+            cache_position_kwargs["model_kwargs"] = model_kwargs
+            model_kwargs = self.language_model._get_initial_cache_position(**cache_position_kwargs)
 
         for _ in range(max_new_tokens):
             # prepare model inputs