Create a function that takes a list (slot machine outcome) and returns True if all elements in the list are identical, and False otherwise. The list will contain 4 elements.
test_jackpot(["@", "@", "@", "@"]) ➞ True
test_jackpot(["abc", "abc", "abc", "abc"]) ➞ True
test_jackpot(["SS", "SS", "SS", "SS"]) ➞ True
test_jackpot(["&&", "&", "&&&", "&&&&"]) ➞ False
test_jackpot(["SS", "SS", "SS", "Ss"]) ➞ False
The elements must be exactly identical for there to be a jackpot.