Mocking: Variables of Closure type aren't evaluated as code args

    def beatIt = {
      def result = (it >= now)
      Thread.sleep(1)
      now = System.currentTimeMillis()
      return result
    }

    when:
    task.execute(context)

    then:
    1 * loggingService.startJob(job, _, beatIt) >> jobExec    // doesn't work
    1 * loggingService.startJob(job, _, { beatIt(it) }) >> jobExec // works

Example is from one of my tests, where I discovered it.

From what I can tell, it is related to how you decide what is a code argument in the InteractionRewriter.addArg method. Maybe try also inspecting any VariableExpressions for closure type?

Start at InteractionRewriter.addArg and trace how closure arguments are classified, including VariableExpressions whose type is Closure. Use the two shown interaction forms as regression cases and verify that passing a closure variable evaluates it as a code argument just like the inline closure form.