public String getConstraintsAsString() {
        return constraintsString;
    }
@Test
    void getConstraintsAsString() {
        KiePMMLFieldOperatorValue kiePMMLFieldOperatorValue = getKiePMMLFieldOperatorValueWithName();
        String expected = "value < 35 surrogate value > 85";
        String retrieved = kiePMMLFieldOperatorValue.getConstraintsAsString();
        assertThat(retrieved).isEqualTo(expected);
        kiePMMLFieldOperatorValue = getKiePMMLFieldOperatorValueWithoutName();
        expected = "value < 35 surrogate value > 85";
        retrieved = kiePMMLFieldOperatorValue.buildConstraintsString();
        assertThat(retrieved).isEqualTo(expected);
    }