If the test ​is a fallback test, there is no requirement for a script as it only uses the mag data from the back of the card. 

For fallback tests, you will see a text box with a blue box when you run the test and will tell you which specific card you need to use as below:



You then need to follow the instructions given in the Transaction Details at the bottom of the screen (Yellow box):



You will also see a prompt at the top which will flash yellow and blue when you run the test:

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Once you have run the test, place the card back on the reader and then press the "back" button to complete the test and answer observation questions