How to use the xrm-mock.ItemCollectionMock function in xrm-mock

Ui.prototype.createUi = function () {
        return new XrmMock.UiMock({
            controls: new XrmMock.ItemCollectionMock([]),
            formSelector: new XrmMock.FormSelectorMock(new XrmMock.ItemCollectionMock([
                Form.createBlankForm()
            ]))
        });
    };

XrmMockGenerator.prototype.initialise = function () {
        var Xrm = new XrmMock.XrmStaticMock({
            page: new XrmMock.PageMock({
                context: new XrmMock.ContextMock({
                    userRoles: []
                }),
                data: new XrmMock.DataMock(
                    new XrmMock.EntityMock(
                        "{00000000-0000-0000-0000-000000000000}",
                        new XrmMock.ItemCollectionMock([]))),
                ui: Ui.createUi()
            })
        });

        return global.Xrm = Xrm;
    };