function assert(b, m) {
    if (!b)
        alert(m);
}

function ObjectId(id) {
    return id;
}

var t1result = [
    {"_id": ObjectId("4dc07fedd8420ab8d0d4066d"), "pageViews": 5, "tags": ["fun", "good"]},
    {"_id": ObjectId("4dc07fedd8420ab8d0d4066e"), "pageViews": 7, "tags": ["fun", "nasty"]},
    {"_id": ObjectId("4dc07fedd8420ab8d0d4066f"), "pageViews": 6, "tags": ["nasty", "filthy"]}
];