var res = db.isMaster();
// check that the fields that should be there are there and have proper values
assert( res.maxBsonObjectSize &&
        isNumber(res.maxBsonObjectSize) &&
        res.maxBsonObjectSize > 0, "maxBsonObjectSize possibly missing:" + tojson(res));
assert( res.maxMessageSizeBytes &&
        isNumber(res.maxMessageSizeBytes) &&
        res.maxBsonObjectSize > 0, "maxMessageSizeBytes possibly missing:" + tojson(res));
assert( res.maxWriteBatchSize &&
        isNumber(res.maxWriteBatchSize) &&
        res.maxWriteBatchSize > 0, "maxWriteBatchSize possibly missing:" + tojson(res));
assert(res.ismaster, "ismaster missing or false:" + tojson(res));
assert(res.localTime, "localTime possibly missing:" + tojson(res));


if (!testingReplication) {
    var badFields = [];
    var unwantedReplSetFields = ["setName", "setVersion", "secondary", "hosts", "passives", 
                                 "arbiters", "primary", "aribterOnly", "passive", 
                                 "slaveDelay", "hidden", "tags", "buildIndexes", "me"];
    // check that the fields that shouldn't be there are not there
    for (field in res) {
        if (!res.hasOwnProperty(field)) {
            continue;
        }
        if (Array.contains(unwantedReplSetFields, field)) {
            badFields.push(field);
        }
    }
    assert(badFields.length === 0, "\nthe result:\n" + tojson(res)
                                   + "\ncontained fields it shouldn't have: " + badFields);
}
