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You are working on a JavaScript function calculateDiscount(price, discountPercentage) that applies a percentage discount to a given price. The function looks like this: function calculateDiscount ( price , discountPercentage ) { if ( price 100 ) { return null ; } return price - ( price * discountPercentage / 100 ); } You want to generate unit tests for this function using GitHub Copilot. What is the most effective approach to utilize Copilot for generating relevant test cases, including edge cases?