Added test case for BUG#6129: Stored procedure won't display @@sql_mode value.

mysql-test/r/sp.result:
  Added testcase for BUG#6129: Check that sql_mode is really set in mysql.proc.
mysql-test/t/sp.test:
  Added testcase for BUG#6129: Check that sql_mode is really set in mysql.proc.

mysql-test/r/sp.result

@@ -2850,4 +2850,16 @@ begin
 end|
 call avg ()|
 drop procedure avg|
+drop procedure if exists bug6129|
+set @@sql_mode = 'traditional'|
+create procedure bug6129(mode text)
+select @@sql_mode = mode|
+call bug6129(@@sql_mode)|
+@@sql_mode = mode
+1
+set @@sql_mode = ''|
+call bug6129(@@sql_mode)|
+@@sql_mode = mode
+0
+drop procedure bug6129|
 drop table t1,t2;

mysql-test/t/sp.test

@@ -3495,6 +3495,25 @@ call avg ()|
 drop procedure avg|
 
 
+#
+# BUG#6129: Stored procedure won't display @@sql_mode value
+#
+--disable_warnings
+drop procedure if exists bug6129|
+--enable_warnings
+set @@sql_mode = 'traditional'|
+create procedure bug6129(mode text)
+  select @@sql_mode = mode|
+
+# 1
+call bug6129(@@sql_mode)|
+set @@sql_mode = ''|
+# 0
+call bug6129(@@sql_mode)|
+
+drop procedure bug6129|
+
+
 #
 # BUG#NNNN: New bug synopsis
 #