public void TestFindPackage()
        {
            repositoryOne.AddPackage(Helper.MockPackage("foo", "1.0"));
            repositoryTwo.AddPackage(Helper.MockPackage("bar", "1.0"));

            Assert.AreEqual("foo", repositoryComposite.FindPackage("foo", "1.0").GetName());
            Assert.AreEqual("1.0", repositoryComposite.FindPackage("foo", "1.0").GetVersionPretty());
            Assert.AreEqual("bar", repositoryComposite.FindPackage("bar", "1.0").GetName());
            Assert.AreEqual("1.0", repositoryComposite.FindPackage("bar", "1.0").GetVersionPretty());

            Assert.AreEqual(null, repositoryComposite.FindPackage("foo", "2.0"));
        }