Spock: Nothing to test here

A reminder why a test should fail first. The following test is green:

def "test absolutely nothing"() {

    when:
    def list = [1, 2, 3]

    then:
    list.each {
        it > 0
    }
}

The following test is also green:

def "test absolutely nothing"() {

    when:
    def list = [-1, -2, -3]

    then:
    list.each {
        it > 0
    }
}

The Spock framework documentation states for then and expect blocks:

Except for calls to void methods and expressions classified as interactions, all top-level expressions in these blocks are implicitly treated as conditions.

To repair the test we have to assert ourselves:

assert it > 0

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