public void testContrapositives()
{
List<Chain> conts;
Literal p = new Literal(new Predicate("P", new List<Term>()));
Literal notq = new Literal(new Predicate("Q", new List<Term>()),
true);
Literal notr = new Literal(new Predicate("R", new List<Term>()),
true);
Chain c = new Chain();
conts = c.getContrapositives();
Assert.AreEqual(0, conts.Count);
c.addLiteral(p);
conts = c.getContrapositives();
Assert.AreEqual(0, conts.Count);
c.addLiteral(notq);
conts = c.getContrapositives();
Assert.AreEqual(1, conts.Count);
Assert.AreEqual("<~Q(),P()>", conts[0].ToString());
c.addLiteral(notr);
conts = c.getContrapositives();
Assert.AreEqual(2, conts.Count);
Assert.AreEqual("<~Q(),P(),~R()>", conts[0].ToString());
Assert.AreEqual("<~R(),P(),~Q()>", conts[1].ToString());
}
public void testIsEmpty()
{
Chain c = new Chain();
Assert.IsTrue(c.isEmpty());
c.addLiteral(new Literal(new Predicate("P", new List<Term>())));
Assert.IsFalse(c.isEmpty());
List<Literal> lits = new List<Literal>();
lits.Add(new Literal(new Predicate("P", new List<Term>())));
c = new Chain(lits);
Assert.IsFalse(c.isEmpty());
}