Single column Date table issue:Groovy:Date variable '_' needs to be declared as method parameter

Another way to achieve single column is to use data pipes http://spockframework.org/spock/docs/1.0/data_driven_testing.html

where:
editStatus << [FINISHED, CANCELED]

The parameter list has to be either () or (Status editStatus, _). (You can't declare just one data variable but not the other.) There is an open pull request to allow (Status editStatus) in this particular case.