Generate: add test to check KV format (#23403)

Co-authored-by: amyeroberts <22614925+amyeroberts@users.noreply.github.com>

tests/models/bloom/test_modeling_bloom.py

@@ -393,6 +393,10 @@ class BloomModelTest(ModelTesterMixin, GenerationTesterMixin, PipelineTesterMixi
         config_and_inputs = self.model_tester.prepare_config_and_inputs()
         self.model_tester.create_and_check_bloom_weight_initialization(*config_and_inputs)
 
+    @unittest.skip("Bloom has a non-standard KV cache format.")
+    def test_past_key_values_format(self):
+        pass
+
     @slow
     def test_model_from_pretrained(self):
         for model_name in BLOOM_PRETRAINED_MODEL_ARCHIVE_LIST[:1]: