@Test
public void buildConstraintsString() {

    OPERATOR operator = OPERATOR.LESS_THAN;
    Object value = 234;
    KiePMMLOperatorValue kiePMMLOperatorValue = new KiePMMLOperatorValue(operator, value);
    String retrieved = kiePMMLOperatorValue.buildConstraintsString();
    String expected = String.format(VALUE_CONSTRAINT_PATTERN, operator.getOperator(), value);
    assertEquals(expected, retrieved);
}