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

        public virtual void TestBasicSnapshots()
        {
            int numSnapshots = 3;

            // Create 3 snapshots: snapshot0, snapshot1, snapshot2
            Directory dir = NewDirectory();
            IndexWriter writer = new IndexWriter(dir, GetConfig(Random(), DeletionPolicy));
            SnapshotDeletionPolicy sdp = (SnapshotDeletionPolicy)writer.Config.DelPolicy;
            PrepareIndexAndSnapshots(sdp, writer, numSnapshots);
            writer.Dispose();

            Assert.AreEqual(numSnapshots, sdp.Snapshots.Count);
            Assert.AreEqual(numSnapshots, sdp.SnapshotCount);
            AssertSnapshotExists(dir, sdp, numSnapshots, true);

            // open a reader on a snapshot - should succeed.
            DirectoryReader.Open(Snapshots[0]).Dispose();

            // open a new IndexWriter w/ no snapshots to keep and assert that all snapshots are gone.
            sdp = DeletionPolicy;
            writer = new IndexWriter(dir, GetConfig(Random(), sdp));
            writer.DeleteUnusedFiles();
            writer.Dispose();
            Assert.AreEqual(1, DirectoryReader.ListCommits(dir).Count, "no snapshots should exist");
            dir.Dispose();
        }