@Test
public void sanitize() {

    assertEquals("Kramer", StringHelper.sanitize("Kr\u00E4mer"));
    assertEquals("Giessen", StringHelper.sanitize("Gie\u00dfen"));
    assertEquals("Elsyee", StringHelper.sanitize("Elsy\u00e9e"));
    assertEquals("Champs_Elysees", StringHelper.sanitize("Champs-\u00c9lys\u00e9es"));
    assertEquals("A_test_with_spaces", StringHelper.sanitize("A test with spaces"));
    assertEquals("any_thing_else", StringHelper.sanitize("any+thing*else"));
    assertEquals("Numbers_0124", StringHelper.sanitize("Numbers 0124"));
}