public void TestDocFreq()
{
RAMDirectory dir1 = new RAMDirectory();
RAMDirectory dir2 = new RAMDirectory();
InitIndex(dir1, 10, true, "x"); // documents with two tokens "doc0" and "x", "doc1" and x, etc...
InitIndex(dir2, 5, true, "x"); // documents with two tokens "doc0" and "x", "doc1" and x, etc...
IndexSearcher searcher1 = new IndexSearcher(dir1, true);
IndexSearcher searcher2 = new IndexSearcher(dir2, true);
MultiSearcher multiSearcher = GetMultiSearcherInstance(new Searcher[] { searcher1, searcher2 });
Assert.AreEqual(15, multiSearcher.DocFreq(new Term("contents", "x")));
}