add test case

Former-commit-id: c452d65e1551074dddd1d87517c0d44dc014c6aa

tests/model/model_utils/test_checkpointing.py

@@ -51,6 +51,12 @@ def test_checkpointing_disable():
         assert getattr(module, "gradient_checkpointing") is False
 
 
+def test_unsloth_gradient_checkpointing():
+    model = load_train_model(use_unsloth_gc=True, **TRAIN_ARGS)
+    for module in filter(lambda m: hasattr(m, "gradient_checkpointing"), model.modules()):
+        assert module._gradient_checkpointing_func.__self__.__name__ == "UnslothGradientCheckpointing"
+
+
 def test_upcast_layernorm():
     model = load_train_model(upcast_layernorm=True, **TRAIN_ARGS)
     for name, param in model.named_parameters():