the parameter is an integer array, so to correctly call the method you will need to instance a new int array, like this
containsItems(new int[] { 1, 2, 3}, new int[] { 10, 20, 30}) {
}
however if it were me, I would rather reference the Item object, then you can declare the itemid and amount in the same parameter like this
containsItems(new Item[] { new Item(995, 10000 ), new Item(1050, 1) }) {
}