* データ準備
*/
private void prepareData() {
Response response = client.query(new Query("test", "testQuery", 0, 100, new BasicBSONObject(), null));
client.delete(new Delete("test", "testQuery", new BasicBSONObject()));
response = client.query(new Query("test", "$cmd", 0, 1, new BasicBSONObject("count", "testQuery"), null));
Assert.assertEquals(1, response.getNumberReturned());
BSONObject result = response.getDocuments().get(0);
Assert.assertEquals(0.0, result.get("n"));