ISSUES-5436 add integration test for custom http

dbms/tests/integration/test_custom_http/configs/custom_http.xml

-<yandex>
-    <http_port>8123</http_port>
-    <CustomHTTP>
-        <HTTPMatch>
-            <URL>/${database}/a/${id}/${table}</URL>
-            <QUERY>INSERT INTO ${database:ASTIdentifier}.${table:ASTIdentifier}(id) VALUES</QUERY>
-            <QUERY>SELECT * FROM ${database:ASTIdenfier}.t</QUERY>
-            <QUERY>SELECT * FROM a.${table:ASTIdenfier} WHERE id={id:UInt8}</QUERY>
-        </HTTPMatch>
-    </CustomHTTP>
-</yandex>

dbms/tests/integration/test_custom_http/configs/custom_http_config.xml

+<yandex>
+    <http_port>8123</http_port>
+
+    <custom_http>
+        <test_for_single_insert>
+            <URL>/test_for_single_insert</URL>
+            <query>INSERT INTO test.test VALUES</query>
+        </test_for_single_insert>
+
+        <test_for_single_select>
+            <URL>/test_for_single_select</URL>
+            <query>SELECT * FROM test.test ORDER BY id</query>
+        </test_for_single_select>
+
+        <test_for_multiple_select>
+            <URL>/test_for_multiple_select</URL>
+            <query>SELECT * FROM test.test ORDER BY id</query>
+            <query>SELECT * FROM test.test ORDER BY id</query>
+        </test_for_multiple_select>
+
+        <test_for_hybrid_insert_and_select_with_one_insert>
+            <URL>/test_for_multiple_select</URL>
+            <query>INSERT INTO test.test VALUES</query>
+            <query>SELECT 'test_for_hybrid_insert_and_select_with_one_insert first'</query>
+            <query>SELECT 'test_for_hybrid_insert_and_select_with_one_insert second'</query>
+        </test_for_hybrid_insert_and_select_with_one_insert>
+
+        <!--  ErrorCode test
+            <test_for_hybrid_insert_and_select_with_multiple_insert>
+            </test_for_hybrid_insert_and_select_with_multiple_insert>
+
+            <test_for_multiple_insert>
+                <URL>/test_for_multiple_insert</URL>
+                <query>SELECT * FROM test.test ORDER BY id</query>
+            </test_for_multiple_insert>
+        -->
+
+        <test_for_url_match>
+            <URL>/test_for_url_match</URL>
+            <query>SELECT 'Matched test_for_url_match'</query>
+        </test_for_url_match>
+
+        <test_for_method_match>
+            <URL>PUT</URL>
+            <query>SELECT 'Matched test_for_method_match'</query>
+        </test_for_method_match>
+
+        <test_for_multiple_match>
+            <URL>/test_for_multiple_match</URL>
+            <method>GET</method>
+            <query>SELECT 'Matched test_for_multiple_match'</query>
+        </test_for_multiple_match>
+    </custom_http>
+</yandex>

dbms/tests/integration/test_custom_http/test.py

 import pytest
-import requests
 
 from helpers.cluster import ClickHouseCluster
-from helpers.test_tools import assert_eq_with_retry
 
 cluster = ClickHouseCluster(__file__)
-node = cluster.add_instance('node', main_configs=['configs/custom_http.xml'])
+test_instance = cluster.add_instance('node', main_configs=['configs/custom_http_config.xml'])
+
 
 @pytest.fixture(scope="module")
 def start_cluster():
     try:
         cluster.start()
-        node.query('''
-CREATE DATABASE `test`;
-
-CREATE TABLE `test`.`test_custom_http` (`id` UInt8) Engine=Memory;
-        ''')
-
+        test_instance.query('CREATE DATABASE `test`')
+        test_instance.query('CREATE TABLE `test`.`test` (`id` UInt8) Engine = Memory')
         yield cluster
     finally:
         cluster.shutdown()
 
-def test(started_cluster):
-    node_ip = cluster.get_instance_ip(node)
-    url = 'http://%s:8123/test/a/1/test_custom_http' % node_ip
-    data="(1)"
-    params = {'id':1}
-    response = requests.post(url, params = params, data = data)
 
-    assert response.text == '\n1\n1\n'
+def test_for_single_insert(started_cluster):
+    assert test_instance.http_query('/test_for_single_insert', data='(1)(2)(3)') == '\n'