def test_is_example_file_true_if_not_suffix():
    """
    Should be false if the file does not end in EXAMPLE_FILE_SUFFIX.
    """
    file_name = 'aliases.json'
    actual = util._is_example_file(file_name)
    assert actual == False

    Should be false if the file does not end in EXAMPLE_FILE_SUFFIX.
    
test/util_test.py