jstests/core/counta.js


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// Check that count returns 0 in some exception cases.
(function() {
    'use strict';

    var t = db.jstests_counta;
    t.drop();

    for (var i = 0; i < 10; ++i) {
        t.save({a: i});
    }

    // f() is undefined, causing an assertion
    assert.throws(function() {
        t.count({
            $where: function() {
                if (this.a < 5) {
                    return true;
                } else {
                    f();
                }
            }
        });
    });

    // count must return error if collection name is absent
    var res = assert.commandFailed(db.runCommand("count"));
    assert.eq(ErrorCodes.InvalidNamespace, res.code);

})();