public void TestHasPackage()
{
repositoryOne.AddPackage(Helper.MockPackage("foo", "1.0"));
repositoryTwo.AddPackage(Helper.MockPackage("bar", "1.0"));
Assert.IsTrue(repositoryComposite.HasPackage(Helper.MockPackage("foo", "1.0")));
Assert.IsTrue(repositoryComposite.HasPackage(Helper.MockPackage("bar", "1.0")));
Assert.IsFalse(repositoryComposite.HasPackage(Helper.MockPackage("foo", "2.0")));
Assert.IsFalse(repositoryComposite.HasPackage(Helper.MockPackage("bar", "2.0")));
}