Spock - extracting interactions to method

Question

The spock documentation points out that you can extract assertions of then block to other method and add assert keyword before each assertion.

Answer 1

Turns out you can. You have to wrap helper method call with interaction:

then:
    interaction {
         helperMethod()
    }

and then you can put interactions in a helper method like that:

def helperMethod() {
    1 * someObj.getInt() >> 2
}

I did it other way around (wrapped helper method body in interaction), that's why it did not work