fix: Add post init check for `FileCache` hash type.

src/poetry/utils/cache.py

@@ -100,6 +100,12 @@ class FileCache(Generic[T]):
     path: Path
     path: Path
     hash_type: str = "sha256"
     hash_type: str = "sha256"
 
 
+    def __post_init__(self) -> None:
+        if self.hash_type not in _HASHES:
+            raise ValueError(
+                f"FileCache.hash_type is unknown value: '{self.hash_type}'."
+            )
+
     def get(self, key: str) -> T | None:
     def get(self, key: str) -> T | None:
         return self._get_payload(key)
         return self._get_payload(key)
 
 

tests/utils/test_cache.py

@@ -85,6 +85,12 @@ def cachy_dict_cache() -> CacheManager:
     return patch_cachy(cache)
     return patch_cachy(cache)
 
 
 
 
+def test_cache_validates(repository_cache_dir: Path) -> None:
+    with pytest.raises(ValueError) as e:
+        FileCache(repository_cache_dir / "cache", hash_type="unknown")
+    assert str(e.value) == "FileCache.hash_type is unknown value: 'unknown'."
+
+
 @pytest.mark.parametrize("cache_name", ["cachy_file_cache", "poetry_file_cache"])
 @pytest.mark.parametrize("cache_name", ["cachy_file_cache", "poetry_file_cache"])
 def test_cache_get_put_has(cache_name: str, request: FixtureRequest) -> None:
 def test_cache_get_put_has(cache_name: str, request: FixtureRequest) -> None:
     cache = request.getfixturevalue(cache_name)
     cache = request.getfixturevalue(cache_name)