ERROR_MESSAGES

Extracts the list of error messages issued during the execution of the ruleset.

The extracted value is a table of strings, and can be compared using the following operators:

Operator	Compares
`EQUALS`	The extracted list is equal in contents to the test list.
`EQUALS_ORDER`	The extracted list is equal in contents and in order of appearance to the test list.
`CONTAINS`	The extracted list contains at least one occurrence of each error message in the test list.
`CONTAINS_ORDER`	The extracted list contains at least one occurrence of each error message in the test list, respecting the order of appearance.
`NOT_CONTAINS`	The extracted list does not contain the error messages in the test list.