public void TestClearRemovesAllTriples()
{
var c = new TripleCollection();
c.AddRange(new[] { T1, T2, T3, T4, T5, T6 });
var triples = c.Items.ToList();
Assert.AreEqual(6, triples.Count);
c.Clear();
Assert.AreEqual(0, c.Items.Count());
triples = c.Items.ToList();
Assert.AreEqual(0, triples.Count);
}