Lucene.Net.Index.TestSnapshotDeletionPolicy.TestSnapshotLastCommitTwice C# (CSharp) Method

        public virtual void TestSnapshotLastCommitTwice()
        {
            Directory dir = NewDirectory();

            IndexWriter writer = new IndexWriter(dir, GetConfig(Random(), DeletionPolicy));
            SnapshotDeletionPolicy sdp = (SnapshotDeletionPolicy)writer.Config.DelPolicy;
            writer.AddDocument(new Document());
            writer.Commit();

            IndexCommit s1 = sdp.Snapshot();
            IndexCommit s2 = sdp.Snapshot();
            Assert.AreSame(s1, s2); // should be the same instance

            // create another commit
            writer.AddDocument(new Document());
            writer.Commit();

            // release "s1" should not delete "s2"
            sdp.Release(s1);
            writer.DeleteUnusedFiles();
            CheckSnapshotExists(dir, s2);

            writer.Dispose();
            dir.Dispose();
        }