Added a test

tests/queries/0_stateless/01370_client_autocomplete_word_break_characters.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/expect -f
+
+log_user 0
+set timeout 1
+match_max 100000
+
+spawn clickhouse-client
+expect ":) "
+
+# Make a query
+send -- "SET max_distributed"
+expect "SET max_distributed"
+
+# Wait for suggestions to load, they are loaded in background
+set is_done 0
+while {$is_done == 0} {
+    send -- "\t"
+    expect {
+        "_connections" {
+            set is_done 1
+        }
+        default {
+            sleep 1
+        }
+    }
+}
+
+send -- "\3\4"
+expect eof