BUG#9879 delimiter command discrepancy (4.1 vs. 5.0, mysql vs. mysqltest)

- Added testcases to test delimiters in 5.0
 - In 5.0 it's allowed to have a up to 16 byte string as delimiter, everything after the delimiter token will be treated as the delimiter. It's even allowed to set delimiter to 'delimiter', ':;' or'MySQL'

mysql-test/t/mysql_delimiter.sql

@@ -0,0 +1,48 @@
+
+# Test default delimiter ;
+select "Test default delimiter ;" as " ";
+select * from t1;
+
+# Test delimiter without argument
+select "Test delimiter without arg" as " ";
+# Nothing should be displayed, error is returned
+delimiter
+delimiter ; # Reset delimiter
+
+# Test delimiter :
+select "Test delimiter :" as " ";
+delimiter :
+select * from t1:
+delimiter ; # Reset delimiter
+
+# Test delimiter ':'
+select "Test delimiter :" as " ";
+delimiter ':'
+select * from t1:
+delimiter ; # Reset delimiter
+
+# Test delimiter :;
+select "Test delimiter :;" as " ";
+delimiter :;
+select * from t1 :;
+delimiter ; # Reset delimiter
+
+## Test delimiter //
+select "Test delimiter //" as " ";
+delimiter //
+select * from t1//
+delimiter ; # Reset delimiter
+
+# Test delimiter 'MySQL'
+select "Test delimiter MySQL" as " ";
+delimiter 'MySQL'
+select * from t1MySQL
+delimiter ; # Reset delimiter
+
+# Test delimiter 'delimiter'(should be allowed according to the code)
+select "Test delimiter delimiter" as " ";
+delimiter delimiter
+select * from t1 delimiter
+delimiter ; # Reset delimiter
+
+