TestTestgresCommon::test_get_pg_config2 is added

Author: dmitry-lipetsk

tests/test_testgres_common.py

@@ -5,6 +5,7 @@
 from ..testgres.node import PgVer
 from ..testgres.node import PostgresNode
 from ..testgres.utils import get_pg_version2
+from ..testgres.utils import get_pg_config2
 from ..testgres.utils import file_tail
 from ..testgres.utils import get_bin_path2
 from ..testgres import ProcessType
@@ -1064,6 +1065,31 @@ def test_dump(self, os_ops: OsOperations):
                         res = node3.execute(query_select)
                         assert (res == [(1, ), (2, )])
 
+    def test_get_pg_config2(self, os_ops: OsOperations):
+        # check same instances
+        a = get_pg_config2(os_ops, None)
+        b = get_pg_config2(os_ops, None)
+        assert (id(a) == id(b))
+
+        # save right before config change
+        c1 = get_pg_config2(os_ops, None)
+
+        # modify setting for this scope
+        with scoped_config(cache_pg_config=False) as config:
+            # sanity check for value
+            assert not (config.cache_pg_config)
+
+            # save right after config change
+            c2 = get_pg_config2(os_ops, None)
+
+            # check different instances after config change
+            assert (id(c1) != id(c2))
+
+            # check different instances
+            a = get_pg_config2(os_ops, None)
+            b = get_pg_config2(os_ops, None)
+            assert (id(a) != id(b))
+
     @staticmethod
     def helper__get_node(os_ops: OsOperations, name=None):
         assert isinstance(os_ops, OsOperations)