Added tests

dbms/tests/integration/test_distributed_format/configs/remote_servers.xml

+<yandex>
+    <remote_servers>
+        <test_cluster>
+            <shard>
+                <replica>
+                    <host>not_existing</host>
+                    <port>9000</port>
+                </replica>
+            </shard>
+        </test_cluster>
+    </remote_servers>
+</yandex>

dbms/tests/integration/test_distributed_format/test.py

+import time
+import pytest
+
+from helpers.cluster import ClickHouseCluster
+from multiprocessing.dummy import Pool
+from helpers.client import QueryRuntimeException, QueryTimeoutExceedException
+
+from helpers.test_tools import assert_eq_with_retry
+
+
+cluster = ClickHouseCluster(__file__)
+node = cluster.add_instance('node', config_dir="configs", main_configs=['configs/remote_servers.xml'])
+
+
+@pytest.fixture(scope="module")
+def started_cluster():
+    try:
+        cluster.start()
+        yield cluster
+
+    finally:
+        cluster.shutdown()
+
+
+def test_single_file(started_cluster):
+    node.query("create table distr_1 (x UInt64, s String) engine = Distributed('test_cluster', database, table)")
+    node.query("insert into distr_1 values (1, 'a'), (2, 'bb'), (3, 'ccc')")
+
+    query = "select * from file('/var/lib/clickhouse/data/default/distr_1/default@not_existing:9000/1.bin', 'Distributed')"
+    out = node.exec_in_container(['/usr/bin/clickhouse', 'local', '--stacktrace', '-q', query])
+
+    assert out == '1\ta\n2\tbb\n3\tccc\n'
+
+    query = "create table t (dummy UInt32) engine = File('Distributed', '/var/lib/clickhouse/data/default/distr_1/default@not_existing:9000/1.bin');" \
+            "select * from t"
+    out = node.exec_in_container(['/usr/bin/clickhouse', 'local', '--stacktrace', '-q', query])
+
+    assert out == '1\ta\n2\tbb\n3\tccc\n'
+
+    node.query("drop table distr_1")
+
+
+def test_two_files(started_cluster):
+    node.query("create table distr_2 (x UInt64, s String) engine = Distributed('test_cluster', database, table)")
+    node.query("insert into distr_2 values (0, '_'), (1, 'a')")
+    node.query("insert into distr_2 values (2, 'bb'), (3, 'ccc')")
+
+    query = "select * from file('/var/lib/clickhouse/data/default/distr_2/default@not_existing:9000/{1,2,3,4}.bin', 'Distributed') order by x"
+    out = node.exec_in_container(['/usr/bin/clickhouse', 'local', '--stacktrace', '-q', query])
+
+    assert out == '0\t_\n1\ta\n2\tbb\n3\tccc\n'
+
+    query = "create table t (dummy UInt32) engine = File('Distributed', '/var/lib/clickhouse/data/default/distr_2/default@not_existing:9000/{1,2,3,4}.bin');" \
+            "select * from t order by x"
+    out = node.exec_in_container(['/usr/bin/clickhouse', 'local', '--stacktrace', '-q', query])
+
+    assert out == '0\t_\n1\ta\n2\tbb\n3\tccc\n'
+
+    node.query("drop table distr_2")