feat: add in-memory JobStore

tests/unit/test_job_store.py

@@ -0,0 +1,35 @@
+# coding=utf-8
+from datetime import datetime
+
+from spark_executor.core.job_store import JobStore
+from spark_executor.models import Job
+
+
+def _job(jid: str) -> Job:
+    return Job(
+        job_id=jid,
+        application_id=f"application_{jid}",
+        script_path="/tmp/j.py",
+        queue="default",
+        submit_time=datetime(2026, 6, 24),
+        connection="prod",
+    )
+
+
+def test_put_then_get_roundtrip():
+    store = JobStore()
+    store.put(_job("a"))
+    assert store.get("a") is not None
+    assert store.get("a").application_id == "application_a"
+
+
+def test_get_missing_returns_none():
+    store = JobStore()
+    assert store.get("nope") is None
+
+
+def test_list_returns_all_jobs():
+    store = JobStore()
+    store.put(_job("a"))
+    store.put(_job("b"))
+    assert {j.job_id for j in store.list()} == {"a", "b"}