1..6
# ->clean()
ok 1 - ->clean() executes the embedded validator
ok 2 - ->clean() throws a InvalidArgumentException if the input value is not an array
ok 3 - ->clean() throws a sfValidatorError if the embedded validator failed
ok 4 - ->clean() throws a sfValidatorError
ok 5 - ->clean() throws a sfValidatorError if the embedded validator failed
ok 6 - ->clean() throws a sfValidatorError
 Looks like everything went fine.