1 files changed, 41 insertions, 0 deletions
diff --git a/tests/test_crate_fetchurl.py b/tests/test_crate_fetchurl.py
new file mode 100644
index 0000000..b4619eb
--- /dev/null
+++ b/tests/test_crate_fetchurl.py
@@ -0,0 +1,41 @@
+import json
+import subprocess
+import unittest
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+
+
+class CrateFetchTests(unittest.TestCase):
+    def evaluate(self, attrs):
+        expression = (
+            f"let fetch = import {ROOT}/nix/fetch-crate.nix (args: args); "
+            f"in fetch (builtins.fromJSON {json.dumps(json.dumps(attrs))})"
+        )
+        return json.loads(
+            subprocess.check_output(
+                ["nix", "eval", "--impure", "--json", "--expr", expression], text=True
+            )
+        )
+
+    def test_crate_uses_static_archive_and_keeps_hash(self):
+        attrs = {
+            "name": "download-hashbrown-0.16.1",
+            "url": "https://crates.io/api/v1/crates/hashbrown/0.16.1/download",
+            "sha256": "locked-checksum",
+        }
+        self.assertEqual(
+            self.evaluate(attrs),
+            {
+                **attrs,
+                "url": "https://static.crates.io/crates/hashbrown/hashbrown-0.16.1.crate",
+            },
+        )
+
+    def test_other_downloads_are_unchanged(self):
+        attrs = {"url": "https://example.org/source.tar.gz", "hash": "unchanged"}
+        self.assertEqual(self.evaluate(attrs), attrs)
+
+    def test_url_lists_are_unchanged(self):
+        attrs = {"urls": ["https://example.org/source.tar.gz"], "hash": "unchanged"}
+        self.assertEqual(self.evaluate(attrs), attrs)