New tests in TestgresRemoteTests are added

New tests:
 - test_init__LANG_С
 - test_init__unk_LANG_and_LC_CTYPE

Author: dmitry-lipetsk

tests/test_simple_remote.py

@@ -119,6 +119,56 @@ def test_custom_init(self):
             # there should be no trust entries at all
             self.assertFalse(any('trust' in s for s in lines))
 
+    def test_init__LANG_С(self):
+        # PBCKP-1744
+        prev_LANG = os.environ.get("LANG")
+
+        try:
+            os.environ["LANG"] = "C"
+
+            with get_remote_node(conn_params=conn_params) as node:
+                node.init().start()
+        finally:
+            __class__.helper__restore_envvar("LANG", prev_LANG)
+
+    def test_init__unk_LANG_and_LC_CTYPE(self):
+        # PBCKP-1744
+        prev_LANG = os.environ.get("LANG")
+        prev_LANGUAGE = os.environ.get("LANGUAGE")
+        prev_LC_CTYPE = os.environ.get("LC_CTYPE")
+        prev_LC_COLLATE = os.environ.get("LC_COLLATE")
+
+        try:
+            os.environ["LANG"] = "UNKNOWN_LANG"
+            os.environ.pop("LANGUAGE", None)
+            os.environ["LC_CTYPE"] = "UNKNOWN_CTYPE"
+            os.environ.pop("LC_COLLATE", None)
+
+            assert os.environ.get("LANG") == "UNKNOWN_LANG"
+            assert not ("LANGUAGE" in os.environ.keys())
+            assert os.environ.get("LC_CTYPE") == "UNKNOWN_CTYPE"
+            assert not ("LC_COLLATE" in os.environ.keys())
+
+            while True:
+                try:
+                    with get_remote_node(conn_params=conn_params):
+                        pass
+                except testgres.exceptions.ExecUtilException as e:
+                    # warning: setlocale: LC_CTYPE: cannot change locale (UNKNOWN_CTYPE): No such file or directory
+                    # postgres (PostgreSQL) 14.12
+                    errMsg = str(e)
+                    assert "LC_CTYPE" in errMsg
+                    assert "UNKNOWN_CTYPE" in errMsg
+                    assert "warning: setlocale: LC_CTYPE: cannot change locale (UNKNOWN_CTYPE): No such file or directory" in errMsg
+                    assert "postgres" in errMsg
+                    break
+                raise Exception("We expected an error!")
+        finally:
+            __class__.helper__restore_envvar("LANG", prev_LANG)
+            __class__.helper__restore_envvar("LANGUAGE", prev_LANGUAGE)
+            __class__.helper__restore_envvar("LC_CTYPE", prev_LC_CTYPE)
+            __class__.helper__restore_envvar("LC_COLLATE", prev_LC_COLLATE)
+
     def test_double_init(self):
         with get_remote_node(conn_params=conn_params).init() as node:
             # can't initialize node more than once
@@ -994,6 +1044,12 @@ def test_child_process_dies(self):
             # try to handle children list -- missing processes will have ptype "ProcessType.Unknown"
             [ProcessProxy(p) for p in children]
 
+    def helper__restore_envvar(name, prev_value):
+        if prev_value is None:
+            os.environ.pop(name, None)
+        else:
+            os.environ[name] = prev_value
+
 
 if __name__ == '__main__':
     if os_ops.environ('ALT_CONFIG'):