test: yaml merge keys

Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>

tests/integration/test_config_yaml_merge_keys/configs/merge_keys.yml

@@ -0,0 +1,41 @@
+---
+settings_common: &settings_common
+  max_threads: 1
+  max_final_threads: 1
+
+settings_extended: &settings_extended
+  max_final_threads: 2
+
+profiles:
+  profile_1:
+    <<: *settings_common
+  profile_2:
+    <<: *settings_common
+    max_threads: 4
+  profile_3:
+    max_threads: 4
+    <<: *settings_common
+  profile_4:
+    <<: *settings_common
+    <<: *settings_extended
+    max_threads: 4
+  profile_5:
+    <<: [*settings_common, *settings_extended]
+    max_threads: 4
+
+users:
+  user_1:
+    profile: profile_1
+    password: ""
+  user_2:
+    profile: profile_2
+    password: ""
+  user_3:
+    profile: profile_3
+    password: ""
+  user_4:
+    profile: profile_4
+    password: ""
+  user_5:
+    profile: profile_5
+    password: ""

tests/integration/test_config_yaml_merge_keys/test.py

@@ -0,0 +1,68 @@
+
+
+import helpers
+import pytest
+from helpers.cluster import ClickHouseCluster
+
+
+def test_yaml_merge_keys_conf():
+    cluster = ClickHouseCluster(__file__)
+    node = cluster.add_instance(
+        "node",
+        user_configs=["configs/merge_keys.yml"]
+    )
+
+    try:
+        cluster.start()
+
+        # Assert simple merge key substitution
+        assert(
+            node.query(
+                "select getSetting('max_threads')", user="user_1"
+            ) == "1\n"
+        )
+
+        # Assert merge key overriden by regular key
+        assert(
+            node.query(
+                "select getSetting('max_threads')", user="user_2"
+            ) == "4\n"
+        )
+
+        # Assert normal key overriden by merge key
+        assert(
+            node.query(
+                "select getSetting('max_threads')", user="user_3"
+            ) == "1\n"
+        )
+
+        # Assert override with multiple merge keys
+        assert(
+            node.query(
+                "select getSetting('max_final_threads')", user="user_4"
+            ) == "2\n"
+        )
+
+        # Assert multiple merge key substitutions overriden by regular key
+        assert(
+            node.query(
+                "select getSetting('max_threads')", user="user_4"
+            ) == "4\n"
+        )
+
+        # Assert override with multiple merge keys for list syntax
+        assert(
+            node.query(
+                "select getSetting('max_final_threads')", user="user_5"
+            ) == "2\n"
+        )
+
+        # Assert multiple merge key substitutions overriden by regular key
+        # for list syntax
+        assert(
+            node.query(
+                "select getSetting('max_threads')", user="user_5"
+            ) == "4\n"
+        )
+    finally:
+        cluster.shutdown()