mongo/jstests/core/datasize2.js

//
// Test dataSize command, when called on the same or different database
// than the collection being queried.
//

(function() {
    "use strict";

    var coll = db.foo;
    var adminDB = db.getSiblingDB('admin');
    coll.drop();

    var N = 1000;
    for (var i = 0; i < N; i++) {
        coll.insert({_id: i, s: "asdasdasdasdasdasdasd"});
    }

    var dataSizeCommand =
        {"dataSize": "test.foo", "keyPattern": {"_id": 1}, "min": {"_id": 0}, "max": {"_id": N}};

    assert.eq(N,
              db.runCommand(dataSizeCommand).numObjects,
              "dataSize command on 'test.foo' failed when called on the 'test' DB.");
    assert.eq(N,
              adminDB.runCommand(dataSizeCommand).numObjects,
              "dataSize command on 'test.foo' failed when called on the 'admin' DB.");

    dataSizeCommand.maxObjects = 100;
    assert.eq(101,
              db.runCommand(dataSizeCommand).numObjects,
              "dataSize command with max number of objects set failed on 'test' DB");
    assert.eq(101,
              db.runCommand(dataSizeCommand).numObjects,
              "dataSize command with max number of objects set failed on 'admin' DB");
})();