Access Spock data provider variable from inside where: block - spring

Question

I'm trying to access a where block variable from within the where block and it is not working. I'm thinking Spock doesn't allow this, but thought I'd give it a shot and see if anyone knows how to do it.
where:
testNumber << Stream.iterate(1, n -> n).iterator()
test << Stream.generate(() -> { testNumber > 15 }).iterator()
Result:
No such property: testNumber for class
If this isn't possible and someone has an alternative way to accomplish something similar I'm open to that. Basically I'm trying to make this test easier to manage, because keeping track of multiple arrays of 15-20 booleans is a bit of a pain:
testNumber << [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]
post << [false, false, false, false, true, true, true, true, true, true, true, true, true, true, true, true]
postWeekend << [true, true, true, true, true, true, false, false, false, false, false, false, false, false, false]
dividendReinvested << [true, false, true, false, true, true, false, true, true, true, true, true, true, true, true]
createCCB << [false, false, false, false, false, false, false, false, false, false, false, false, false, false, true]
ntd << [false, false, false, false, false, false, false, false, false, false, false, false, false, false, false]
But many of them I can set up based on the test number instead, if I can access it (and having the test number available also makes it easy to determine which test failed).

Answer 1

It looks like you want to calculate something based on testNumber.
You can use data variables for that.
Another problem is that you are using an infinite stream, which will not terminate before the jvm will run out of memory. So you need to either use .limit(20) or just use a groovy range to define it more succinctly.
import spock.lang.*
class ASpec extends Specification {
def "hello world"() {
expect:
testNumber > 15 == test
where:
testNumber << (1..20)
test = testNumber > 15
}
}
Try it in the Groovy Web Console.
If that isn't what you wanted then you should update your question as #kriegaex suggested to tell us what you actually want to achieve.

Answer 2

Please do not accept this answer, Leonard's one solved the original problem. I am just presenting some more details.
The Spock manual explains how to access other data variables inside a where block.
Additionally, if in another situation you only need the iteration index in the unrolled method name, but not inside the feature method itself, you can use #iterationIndex. The count starts at index 0. Here is an example showing you both:
package de.scrum_master.stackoverflow.q70661506
import spock.lang.Shared
import spock.lang.Specification
class ReferringToDataTableVariablesTest extends Specification {
#Shared
final n = 8
def "feature [#iterationIndex]: #testNumber, #testRange"() {
println "$testNumber, $testRange, ${testClosure()}"
expect:
true
where:
testNumber << (1..n)
testRange = testNumber + 3..2 * testNumber
testClosure = { -> testNumber / 2 > 2 }
}
}
Try it in the Groovy Web Console.
In my IDE, running the test looks like this: