def run_test_largest_negative_number():
    ' Tests the    largest_negative_number    function. '
    print()
    print('-------------------------------------------------')
    print('Testing the   LARGEST_NEGATIVE_NUMBER   function:')
    print('-------------------------------------------------')
    expected = 11
    answer = largest_number([(3, 1, 4), ((- 13), 10, 11, 7, 10), [1, 2, 3, 4]])
    print('Expected and actual are:', expected, answer)
    expected = (- 2)
    answer = largest_number(([(- 10)], [(- 1111111111111111)], [(- 2)]))
    print('Expected and actual are:', expected, answer)
    expected = None
    answer = largest_number(([], [], []))
    print('Expected and actual are:', expected, answer)
Tests the    largest_negative_number    function.
def run_test_largest_negative_number():
    '  '
    print()
    print('-------------------------------------------------')
    print('Testing the   LARGEST_NEGATIVE_NUMBER   function:')
    print('-------------------------------------------------')
    expected = 11
    answer = largest_number([(3, 1, 4), ((- 13), 10, 11, 7, 10), [1, 2, 3, 4]])
    print('Expected and actual are:', expected, answer)
    expected = (- 2)
    answer = largest_number(([(- 10)], [(- 1111111111111111)], [(- 2)]))
    print('Expected and actual are:', expected, answer)
    expected = None
    answer = largest_number(([], [], []))
    print('Expected and actual are:', expected, answer)