Sunday, April 19, 2015

Spock even more advanced

On Fridays we have technological meetings in our company. Everyone can prepare presentation and "test" this presentation in friendly environment. This time Marcin Zajączkowski - from blog: was presenting his brand new "Advanced Spock". If you work with Spock on daily basis you should attend this presentation (even if you don't feel you need the »advanced« part).
During presentation I was curious what will happen in "where:" section when we pass two arrays with different length and how to cycle over values to test every combination of parameters. Marcin told me he wants to read answers on my blog. Challenge accepted:
First things first, but not necessarily in that order - I will start with combinations. How to test all combinations of parameters?
@Unrolldef "should return combinations pair (#a,#b)" () {
    println("a=${a} b=${b}")
    [a,b] << [[1,2,3],[8,9]].combinations()
This test will end up with:
a=1 b=8
a=2 b=8
a=3 b=8
a=1 b=9
a=2 b=9
a=3 b=9
Now original problem - what will happen when you pass two arrays of different size?
@Unrolldef "should return combinations pair (#a,#b)" () {
    println("a = ${a} b=${b}")
    1==1    where:
    a << [1,2,3]
    b << [8,9]
a = 1 b=8
a = 2 b=9

org.spockframework.runtime.SpockExecutionException: Data provider for variable 'b' has fewer values than previous data provider(s)
at return combinations pair (#a,#b)(RequestUtilsSpec.groovy:60)

This error doesn't leave us any hope - we can't pass two arrays of different length.


  1. Thanks for share that knowledge with others!

    Btw, there are already slides available with my (similar) presentation from 4developers conference:

  2. Hi

    For anyone reading this looking for answers, it is because Spock doesn't invoke the test with a Cartesian set of {a,b}, but tries to merge the two arrays into larger rows of parameters

    a << [1, 2, 3]
    b << [7, 8, 9]

    would yield the following invocations:
    (1, 7)
    (2, 8)
    (3, 9)

    It looks like the author was expecting 6 invocations instead:
    (1, 8)
    (1, 9)
    (2, 8)
    (2, 9)
    (3, 8)
    (3, 9)

  3. The result's that laptop slots are extra efficient and provide higher payout percentages to players in comparison to|compared to} mechanical slots. Since HoF presents only free slot machines with bonus rounds, you'll not win or lose any real cash, but you WILL chill out, sit back, and have enjoyable. These machines can bombard your senses with lights, sounds, or vibrations, all of which are designed to entice you to play both in a on line casino or on-line. Because 코인카지노 of their capacity to attract attention, slot machines are usually the preferred sort of recreation at a on line casino.