WriteConcernTest.java

@Test
public void testGetLastErrorCommand() {
    assertEquals(new BasicDBObject("getlasterror", 1), WriteConcern.UNACKNOWLEDGED.getCommand());
    assertEquals(new BasicDBObject("getlasterror", 1), WriteConcern.ACKNOWLEDGED.getCommand());
    assertEquals(new BasicDBObject("getlasterror", 1).append("w", 2), WriteConcern.REPLICA_ACKNOWLEDGED.getCommand());
    assertEquals(new BasicDBObject("getlasterror", 1).append("j", true), WriteConcern.JOURNALED.getCommand());
    assertEquals(new BasicDBObject("getlasterror", 1).append("fsync", true), WriteConcern.FSYNCED.getCommand());
    assertEquals(new BasicDBObject("getlasterror", 1).append("w", "majority"), new WriteConcern("majority").getCommand());
    assertEquals(new BasicDBObject("getlasterror", 1).append("wtimeout", 100), new WriteConcern(1, 100).getCommand());
}