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dummy run /'dʌmi 'rʌn/  

(countable noun) Usage note: This term is used by many speakers.

A trial or test run, to see if something works properly.

Example: Before spraying the herbicide try a dummy run on a similar area with water only to calibrate your speed of operation. As a general rule thoroughly wet all plant foliage. (http://www.landcarevic.net.au/resources/publications/books/manual/victoria-felix/referencemanual-all-pages)

A presenter doing a dummy run of his talk

(photo by GlobalStock)