Unroll descriptions - "Idiomatic Spock" by Rob Fletcher - http://youtu.be/RuTupC0I59M?t=12m26s

SpockUnrollDesc.groovy

@Unroll
def "the string '#string' is #description"() {
    expect:
    string.isInteger() == expected
    
    where:
    string | expected
    "ABC"  | false
    "123"  | true
    "1.2"  | false
    "1 2"  | false
    "12a"  | false
    
    description = expected ? "an integer" : "not an integer"
}