Test: Does a certain condition on the stud's generated variables hold true
1 2 3 4 5  | holds.true(cond, short.message = failure.message,
  failure.message = "Failure in holds.true",
  success.message = "Great, the condition {{cond}} holds true in your solution!",
  part = NULL, ps = get.ps(), stud.env = ps$stud.env, cond.str = NULL,
  ...)
 | 
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