### Question:
NullaryAnd extends BaseNullaryPredicateList { @Override public boolean equals(Object obj) { if (obj == this) { return true; } if (!(obj instanceof NullaryAnd)) { return false; } NullaryAnd that = (NullaryAnd) obj; return getNullaryPredicateListEquals(that); } NullaryAnd();  NullaryAnd(Iterable<NullaryPredicate> predicates);  NullaryAnd(NullaryPredicate... predicates); NullaryAnd and(NullaryPredicate p); boolean test(); @Override boolean equals(Object obj); @Override int hashCode(); @Override String toString();  }### Answer:
@Test public void testEquals() throws Exception { NullaryAnd p = new NullaryAnd(); assertEquals(p,p); NullaryAnd q = new NullaryAnd(); assertObjectsAreEqual(p,q); for (int i=0;i<3;i++) { p.and(Constant.TRUE); assertObjectsAreNotEqual(p,q); q.and(Constant.truePredicate()); assertObjectsAreEqual(p,q); p.and(new NullaryAnd(Constant.TRUE,Constant.FALSE)); assertObjectsAreNotEqual(p,q); q.and(new NullaryAnd(Constant.TRUE,Constant.FALSE)); assertObjectsAreEqual(p,q); } assertObjectsAreNotEqual(p,Constant.TRUE); Iterable<NullaryPredicate> iterable = Arrays.<NullaryPredicate>asList( Constant.TRUE, new NullaryAnd(Constant.TRUE, Constant.FALSE), Constant.TRUE, new NullaryAnd(Constant.TRUE, Constant.FALSE), Constant.TRUE, new NullaryAnd(Constant.TRUE, Constant.FALSE)); assertObjectsAreEqual(p,new NullaryAnd(iterable)); assertObjectsAreNotEqual(p,new NullaryAnd((Iterable<NullaryPredicate>)null)); assertObjectsAreNotEqual(p,new NullaryAnd((NullaryPredicate[])null)); assertObjectsAreNotEqual(p,new NullaryAnd((NullaryPredicate)null)); assertTrue(!p.equals(null)); }