@Override
    public void verify(String value) {
        if (!this.universe.contains(value)) {
            throw new RuntimeException("value is not in set: " + this.universe);
        }
    }
@Test
    public void verify_ValidValue_NoExceptionThrown() {
        enumAttribute.verify("value1");
        enumAttribute.verify("value2");
        enumAttribute.verify("value3");
    }