Reset id sequence or update id on Grails Test

In Grails 1.3.7, I have a code that filters objects by ID and I need to test that

The domain class has a sequence

static mapping = {
id generator: 'sequence', params[sequence: 'seq_shipping_service']
}

In the test, the object is created several times and I need the identifier to be 11 in all the tests and even though, it deletes the whole database between every test, it doesn't reset the sequence. So I would get a superior ID

foo = createFoo()
foo.id = 11l
foo.save () //This gets error

My ideas are 1) Reset somehow the id sequence so it's everytime the same number between tests 2) Set somehow the id

I don't know if I make myself clear