text: // Check db name duplication constraint SERVER-2111
  
  a = db.getSisterDB("dbcasetest_dbnamea");
  b = db.getSisterDB("dbcasetest_dbnameA");
  
  a.dropDatabase();
  b.dropDatabase();
  
  assert.writeOK(a.foo.save({x: 1}));
  
  res = b.foo.save({x: 1});
  assert.writeError(res);
  
  assert.neq(-1, db.getMongo().getDBNames().indexOf(a.getName()));
  assert.eq(-1, db.getMongo().getDBNames().indexOf(b.getName()));
  printjson(db.getMongo().getDBs().databases);
  
  a.dropDatabase();
  b.dropDatabase();
  
  ai = db.getMongo().getDBNames().indexOf(a.getName());
  bi = db.getMongo().getDBNames().indexOf(b.getName());
  // One of these dbs may exist if there is a slave active, but they must
  // not both exist.
  assert(ai == -1 || bi == -1);
  printjson(db.getMongo().getDBs().databases);
  