public void TestGetImplementation()
{
var digest1 = new ManifestDigest(sha256: "123");
var implementation1 = new Implementation {ManifestDigest = digest1};
var feed1 = new Feed {Elements = {implementation1}};
var digest2 = new ManifestDigest(sha256: "abc");
var implementation2 = new Implementation {ManifestDigest = digest2};
var feed2 = new Feed {Elements = {implementation2}};
var feeds = new[] {feed1, feed2};
Feed feed;
Assert.AreEqual(implementation1, feeds.GetImplementation(digest1, out feed));
Assert.AreEqual(feed1, feed);
Assert.AreEqual(implementation2, feeds.GetImplementation(digest2, out feed));
Assert.AreEqual(feed2, feed);
Assert.IsNull(feeds.GetImplementation(new ManifestDigest(sha256: "invalid"), out feed), "No implementation should have been found");
Assert.IsNull(feed, "No feed should have been found");
}