Lucene.Net.Index.TestIndexReader.TestVersion C# (CSharp) Method

		public virtual void  TestVersion()
		{
			Directory dir = new MockRAMDirectory();
			Assert.IsFalse(IndexReader.IndexExists(dir));
			IndexWriter writer = new IndexWriter(dir, new WhitespaceAnalyzer(), true, IndexWriter.MaxFieldLength.LIMITED);
			AddDocumentWithFields(writer);
            Assert.IsTrue(IndexWriter.IsLocked(dir)); // writer open, so dir is locked
			writer.Close();
			Assert.IsTrue(IndexReader.IndexExists(dir));
			IndexReader reader = IndexReader.Open(dir, false);
            Assert.IsFalse(IndexWriter.IsLocked(dir)); // reader only, no lock
			long version = IndexReader.GetCurrentVersion(dir);
			reader.Close();
			// modify index and check version has been
			// incremented:
			writer = new IndexWriter(dir, new WhitespaceAnalyzer(), true, IndexWriter.MaxFieldLength.LIMITED);
			AddDocumentWithFields(writer);
			writer.Close();
			reader = IndexReader.Open(dir, false);
			Assert.IsTrue(version < IndexReader.GetCurrentVersion(dir), "old version is " + version + "; new version is " + IndexReader.GetCurrentVersion(dir));
			reader.Close();
			dir.Close();
		}