Terry J. Reedy added the comment: If the iterator for 'self' were de-structive, if it removed (popped) the test from whatever structure holds it before yielding it, the messiness of enumerate and the new ._removeTestAtIndex method would not be needed and 'for test in self' would work as desired. If considered necessary, new method .pop_iter, used in 'for test in self.pop_iter', would make it obvious that the iteration empties the collection.
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