public virtual void TestStats()
{
Directory dir = NewDirectory();
RandomIndexWriter iw = new RandomIndexWriter(Random, dir, NewIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(Random)));
Document doc = new Document();
FieldType ft = new FieldType(TextField.TYPE_NOT_STORED);
ft.IndexOptions = IndexOptions.DOCS_ONLY;
ft.Freeze();
Field f = NewField("foo", "bar", ft);
doc.Add(f);
iw.AddDocument(doc);
IndexReader ir = iw.GetReader();
iw.Dispose();
Assert.AreEqual(-1, ir.TotalTermFreq(new Term("foo", new BytesRef("bar"))));
Assert.AreEqual(-1, ir.GetSumTotalTermFreq("foo"));
ir.Dispose();
dir.Dispose();
}