✅ Gremlins MVP: unit and CLI tests with a fake claude

plugins/spire/skills/gremlins/tests/test_store.py

@@ -0,0 +1,36 @@
+import sys
+import tempfile
+import threading
+import unittest
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
+
+from grm import store  # noqa: E402
+
+
+class LedgerTest(unittest.TestCase):
+    def test_parallel_appends_give_whole_lines(self):
+        """B3: two threads appending at once leave only whole, parsable lines."""
+        with tempfile.TemporaryDirectory() as d:
+            run = str(Path(d) / "run.md")
+            store.init_state(run)
+
+            def append(job):
+                for i in range(50):
+                    store.ledger_append(run, {"job": job, "i": i, "pad": "x" * 500})
+            threads = [threading.Thread(target=append, args=(j,)) for j in ("a", "b")]
+            for t in threads:
+                t.start()
+            for t in threads:
+                t.join()
+            raw = (store.state_dir(run) / "ledger.jsonl").read_bytes().splitlines()
+            lines = store.ledger_lines(run)
+            self.assertEqual(len(raw), 100)
+            self.assertEqual(len(lines), 100)
+            self.assertEqual(sorted((x["job"], x["i"]) for x in lines),
+                             sorted((j, i) for j in ("a", "b") for i in range(50)))
+
+
+if __name__ == "__main__":
+    unittest.main()