1..9
# ->initialize()
ok 1 - ->initialize() takes a mandatory pattern parameter
ok 2 - ->initialize() takes a pattern as a parameter
ok 3 - ->initialize() changes $error with a custom message if it returns false
# ->execute()
ok 4 - ->execute() returns true if value match the pattern
ok 5 - ->execute() doesn't change $error if it returns true
ok 6 - ->execute() returns false if value does not match the pattern
ok 7 - ->execute() changes $error with a default message if it returns false
ok 8 - ->execute() returns false if value match the pattern and match parameter is false
ok 9 - ->execute() returns true if value does not match the pattern and match parameter is false
 Looks like everything went fine.