Initial commit

tests/test_replay.py

@@ -0,0 +1,34 @@
+from datetime import UTC, datetime
+
+from kanta import ChangeRecord, Snapshot, replay
+from kanta.serialization.framing import LineFramer
+
+
+def test_empty_data():
+    rr = replay(b"")
+    assert rr.state == {}
+    assert rr.version == 0
+
+
+def test_single_change():
+    rec = ChangeRecord(a="test", v=1, diff={"name": "Alice"})
+    data = b"" + __import__("msgspec").json.encode(rec) + b"\n"
+    rr = replay(data)
+    assert rr.state == {"name": "Alice"}
+    assert rr.version == 1
+
+
+def test_snapshot_then_change():
+    snap = Snapshot(ts=datetime.now(UTC), v=1, state={"counter": 5})
+    line = LineFramer.SNAPSHOT_PREFIX + __import__("msgspec").json.encode(snap) + b"\n"
+    rec = ChangeRecord(a="inc", v=1, diff={"counter": 6})
+    line += __import__("msgspec").json.encode(rec) + b"\n"
+    rr = replay(line)
+    assert rr.state == {"counter": 6}
+
+
+def test_migration_flag():
+    rec = ChangeRecord(a="migrate:v1", v=1, diff={"x": 1})
+    data = __import__("msgspec").json.encode(rec) + b"\n"
+    rr = replay(data)
+    assert rr.has_migration is True