Add get model config tests

tests/test_tuners_utils.py

@@ -43,12 +43,14 @@
     get_peft_model,
 )
 from peft.tuners.tuners_utils import (
+    BaseTuner,
     BaseTunerLayer,
     _maybe_include_all_linear_layers,
     check_target_module_exists,
     inspect_matched_modules,
 )
 from peft.utils import INCLUDE_LINEAR_LAYERS_SHORTHAND, ModulesToSaveWrapper, infer_device
+from peft.utils.constants import DUMMY_MODEL_CONFIG
 
 from .testing_utils import require_bitsandbytes, require_non_cpu, require_torch_gpu
 
@@ -1065,3 +1067,39 @@ def forward(self, X):
 
         with pytest.raises(TypeError, match="get_model_status is not supported for PeftMixedModel"):
             model.get_model_status()
+
+
+# Tests for BaseTuner
+class MockModelConfig:
+    config = {"mock_key": "mock_value"}
+
+    def to_dict(self):
+        return self.config
+
+
+class ModelWithConfig(nn.Module):
+    def __init__(self):
+        self.config = MockModelConfig()
+
+
+class ModelWithDictConfig(nn.Module):
+    def __init__(self):
+        self.config = MockModelConfig.config
+
+
+class ModelWithNoConfig(nn.Module):
+    pass
+
+
+class TestBaseTunerMethods(unittest.TestCase):
+    def test_get_model_config_use_to_dict(self):
+        config = BaseTuner.get_model_config(ModelWithConfig())
+        assert config == MockModelConfig.config
+
+    def test_get_model_config_as_dict(self):
+        config = BaseTuner.get_model_config(ModelWithDictConfig())
+        assert config == MockModelConfig.config
+
+    def test_get_model_config_with_no_config(self):
+        config = BaseTuner.get_model_config(ModelWithNoConfig())
+        assert config == DUMMY_MODEL_CONFIG