raise error on missing default

src/sparsezoo/objects/recipes.py

@@ -76,6 +76,9 @@ def default(self) -> File:
                 return recipe
 
         # fallback to first recipe in list
+        if len(self._recipes) == 0:
+            raise ValueError("No recipes found, could not retrieve a default.")
+
         _LOGGER.warning(
             f"No default recipe {self._default_recipe_name} found, falling back to "
             f"first listed recipe {self._recipes[0].name}"

tests/sparsezoo/objects/test_recipes.py

@@ -14,6 +14,8 @@
 
 import tempfile
 
+import pytest
+
 from sparsezoo.model import Model
 
 
@@ -59,3 +61,12 @@ def test_custom_default():
     available_recipes = model.recipes.available
     assert len(available_recipes) == 1
     assert available_recipes[0] == "recipe_transfer_text_classification"
+
+
+def test_fail_default_on_empty():
+    false_recipe_stub = "zoo:bert-base-wikipedia_bookcorpus-pruned90?recipe=nope"
+    temp_dir = tempfile.TemporaryDirectory(dir="/tmp")
+    model = Model(false_recipe_stub, temp_dir.name)
+
+    with pytest.raises(ValueError):
+        _ = model.recipes.default