test for replicas backward comptability

dbms/tests/integration/test_backward_compatability/test.py

@@ -0,0 +1,31 @@
+import pytest
+
+import helpers.client as client
+from helpers.cluster import ClickHouseCluster
+
+cluster = ClickHouseCluster(__file__)
+node1 = cluster.add_instance('node1', with_zookeeper=True, image='yandex/clickhouse-server:19.17.8.54', stay_alive=True, with_installed_binary=True)
+node2 = cluster.add_instance('node2', with_zookeeper=True)
+
+@pytest.fixture(scope="module")
+def start_cluster():
+    try:
+        cluster.start()
+        for i, node in enumerate([node1, node2]):
+            node.query(
+            '''CREATE TABLE t(date Date, id UInt32)
+            ENGINE = ReplicatedMergeTree('/clickhouse/tables/test/t', '{}')
+            PARTITION BY toYYYYMM(date)
+            ORDER BY id'''.format(i))
+
+        yield cluster
+
+    finally:
+        cluster.shutdown()
+
+
+def test_backward_compatability(start_cluster):
+    node2.query("INSERT INTO t VALUES (today(), 1)")
+    node1.query("SYSTEM SYNC REPLICA t", timeout=10)
+
+    assert node1.query("SELECT count() FROM t") == "1\n"