public void TestRemoveBySubjectPredicateRemoveAllMatches()
{
var c = new TripleCollection();
c.AddRange(new [] { T1, T5 });
Assert.AreEqual(2, c.Count());
c.RemoveBySubjectPredicate("http://example.org/s", "http://example.org/p1");
Assert.AreEqual(1, c.Count());
Assert.IsTrue(c.Items.Any(x => x.Equals(T1)));
}