public void GetPermissionsTest()
        {
            // TODO: add unit test for the method 'GetPermissions'
            int?pageSize   = null; // TODO: replace null with proper value
            int?pageNumber = null; // TODO: replace null with proper value
            var response   = instance.GetPermissions(pageSize, pageNumber);

            Assert.IsInstanceOf <PermissionCollectionEntityListing> (response, "response is PermissionCollectionEntityListing");
        }