#Check that users have entered a valid
#option basd on a list
def string_checker(user_response, valid_ans):
    while True:


        user_response = user_response.lower()

        for item in valid_ans:
            #check if the user response is a word in the list
            if item == user_response:
                return item

            # check if the user response is the same as
            # the first letter of an item in the list
            elif user_response == item [0]:
                return item

        return "invalid"


#automated testing is below in the form (test_case, expected value)
to_test = [
    ("yes", "yes"),
    ("Y", "yes"),
    ("NO", "no"),
    ("N", "no"),
    ("YeS", "yes"),
    ("Maybe", "invalid")
    ]

#run tests!
for item in to_test:
    # retrieve test case and expected value
    case = item[0]
    expected = item[1]

    # get actual value (ie: test ticket function)
    actual = string_checker(case, ["yes", "no"])

    #compare actual and expected and output pass / fail
    if actual == expected:
        print (f" Passed! Case: {case}, expected: {expected}, received: {actual}")
    else:
        print(f" Failed! Case: {case}, expected: {expected}, received: {actual}")