@Test
public void testStringValue() {

    stringPred.setOperator(SimpleSegmentPredicate.EQUAL);
    SimpleSegmentPredicate ssp = new SimpleSegmentPredicate(stringPred);
    String text = ssp.getPredicateRule();
    assertNotNull(text);
    assertEquals("( mTF3 == false ) && ( vTF3 == \"optA\" )",text);
    predicate.setOperator(SimpleSegmentPredicate.EQUAL);
    ssp = new SimpleSegmentPredicate(predicate);
    text = ssp.getPredicateRule();
    assertNotNull(text);
    assertEquals("( mTF2 == false ) && ( vTF2 == 123 )",text);
}