### Question:
MaskMapping { public static SensitiveType getMaskTypeMapping(String fieldName) { return mappings.get(fieldName.toLowerCase()); }  static SensitiveType getMaskTypeMapping(String fieldName);  }### Answer:
@Test public void test() { assertThat(MaskMapping.getMaskTypeMapping("tel")).isNotNull(); assertThat(MaskMapping.getMaskTypeMapping("nickName")).isNotNull(); }