Re-using tests among Geb Specs - groovy

Question

I am trying to re-use a Geb Spec test I wrote in another Geb Spec so I won't need to re-write code. I always need the product number in different pages so I would like to do something similar to the following;
class BasePageGebSpec extends GebReportingSpec {
def firstProductOnBrowsePage(){
when:
to BrowsePage
then:
waitFor { BrowsePage }
productId { $("meta", 0, itemprop: "mpn").#content }
return productID // ???
}
}
And in another GebSpec I wish to use the above firstProductOnBrowsePage like below:
class ProductDetailsPageGebSpec extends BasePageGebSpec {
def "See first products details page"(){
when:
to ProductDetailsPage, productId: firstProductOnBrowsePage()
then:
waitFor { $("h2", class:"title").size() != 0 }
assert true
}
}
Any help would be appreciated,
Thank you!

Answer 1

With traits you can almost get what you want (tests don't work within a trait however). You might also consider creating a spec class that tests the product number for every page you have, and then not worrying about testing this functionality within each individual page's spec class.
trait BasePageGebSpec extends GebReportingSpec {
def testingFirstBrowse() {
waitFor { BrowsePage }
productId { $("meta", 0, itemprop: "mpn").#content }
return productID
}
}
class ProductDetailsPageGebSpec implements BasePageGebSpec {
def firstProductOnBrowsePage(){
when:
to BrowsePage
then:
testingFirstBrowse()
}
}

Answer 2

Add productId as content on the BrowsePage:
class BrowsePage extends Page {
static content = {
productId { $("meta", 0, itemprop: "mpn").#content }
}
}
and then use it in your spec:
class ProductDetailsPageGebSpec extends BasePageGebSpec {
def "See first products details page"(){
when:
to ProductDetailsPage, productId: to(BrowsePage).productId
then:
waitFor { $("h2", class:"title").size() != 0 }
}
}