Add GNS load and reorder acceptance tests

server/tests/test_snapshot_sequence.py

@@ -36,6 +36,14 @@ def test_counter_and_window_enforce_latest_wins():
     assert not window.accept(MAX_SEQUENCE)
 
 
+def test_loss_and_reordering_do_not_stall_newer_snapshots():
+    window = SequenceWindow()
+    arrivals = (1, 3, 2, 6, 4, 5, 6, 8)
+    accepted = [sequence for sequence in arrivals if window.accept(sequence)]
+    assert accepted == [1, 3, 6, 8]
+    assert window.last_accepted == 8
+
+
 def test_invalid_sequence_inputs_are_rejected():
     assert not is_newer(-1, 0)
     assert not is_newer(1, -1)