mongodb/jstests/gle/updated_existing.js

/**
* SERVER-5872 : This test checks that the return message "updatedExisting" of
*               an upsert is not missing when autosplit takes place.
*/

var st = new ShardingTest({ shards : 1, mongos : 1, verbose : 1, chunksize : 1 });

var testDB = st.getDB("test");
var coll = "foo";
testDB[coll].drop();

st.adminCommand({ enablesharding : 'test' });
st.adminCommand({ shardcollection : 'test.' + coll, key : { "shardkey2" : 1, "shardkey1" : 1 } });

var bigString = "";
while ( bigString.length < 1024 * 50 )
    bigString += "asocsancdnsjfnsdnfsjdhfasdfasdfasdfnsadofnsadlkfnsaldknfsad";



for (var i = 0; i < 10000; ++i) {
    testDB[coll].update({ "shardkey1" : "test" + i, "shardkey2" : "test" + i },
                    { $set : { "test_upsert": bigString } },
                    true, // upsert
                    false); // multi
    assert.eq(testDB.getLastErrorObj().updatedExisting, false);
}

st.stop();