unit testing - Create a combination on input in Spock test -

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in spock test current block 

where:         [a,b,c] <<          [             ["a1","b1","c1"],             ["a1","b1","c2"],         ]

i trying simplify since input , b same. trying use combinations() have been unsuccessful.

i want same job code above.

where:         [[a,b],[c]] <<                 // incorrect         [             [["a1","b1"],["c1","c2"]].combinations()  // incorrect         ]

currently npe

here 1 solution:

where: [a, b, c] << [[["a1","b1"]],["c1","c2"]].combinations()*.flatten()

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