### Question:
ArgumentUtil { static public boolean isInvalid(DataField dataField, Object value){ if(value == null){ return false; } return !isValid(dataField, value); } private  ArgumentUtil(); @SuppressWarnings ( value = {"unused"} ) static FieldValue prepare(DataField dataField, MiningField miningField, Object value); static boolean isOutlier(DataField dataField, Object value); static boolean isMissing(DataField dataField, Object value); static boolean isInvalid(DataField dataField, Object value); @SuppressWarnings ( value = "fallthrough" ) static boolean isValid(DataField dataField, Object value); static List<String> getValidValues(TypeDefinitionField field);  }### Answer:
@Test public void isInvalid(){ assertFalse(ArgumentUtil.isInvalid(null, null)); }