Adding forgotten files for test case for Bug#43138.

mysql-test/r/drop_debug.result

+
+# --
+# -- Bug#43138: DROP DATABASE failure does not clean up message list.
+# --
+
+DROP DATABASE IF EXISTS mysql_test;
+
+CREATE DATABASE mysql_test;
+CREATE TABLE mysql_test.t1(a INT);
+CREATE TABLE mysql_test.t2(b INT);
+CREATE TABLE mysql_test.t3(c INT);
+
+SET SESSION DEBUG = "+d,bug43138";
+
+DROP DATABASE mysql_test;
+Warnings:
+Error	1051	Unknown table 't3'
+Error	1051	Unknown table 't2'
+Error	1051	Unknown table 't1'
+
+SET SESSION DEBUG = "-d,bug43138";
+
+# --
+# -- End of Bug#43138.
+# --

mysql-test/t/drop_debug.test

+# 
+# DROP-related tests which execution requires debug server.
+#
+--source include/have_debug.inc
+
+###########################################################################
+--echo
+--echo # --
+--echo # -- Bug#43138: DROP DATABASE failure does not clean up message list.
+--echo # --
+--echo
+
+--disable_warnings
+DROP DATABASE IF EXISTS mysql_test;
+--enable_warnings
+
+--echo
+CREATE DATABASE mysql_test;
+CREATE TABLE mysql_test.t1(a INT);
+CREATE TABLE mysql_test.t2(b INT);
+CREATE TABLE mysql_test.t3(c INT);
+
+--echo
+SET SESSION DEBUG = "+d,bug43138";
+
+--echo
+DROP DATABASE mysql_test;
+
+--echo
+SET SESSION DEBUG = "-d,bug43138";
+
+--echo
+--echo # --
+--echo # -- End of Bug#43138.
+--echo # --
+
+###########################################################################