public async Task AddRoleToUser_ReturnsModel_WhenUserDoesntExist()
{
//Arrange
userManager.CurrentRole = RoleType.Standard;
controller.ControllerContext.HttpContext = new DefaultHttpContext();
//Act
var result = await controller.AddRoleToUser("username", RoleType.Administrator.ToString());
//Assert
var redirectToActionResult = Assert.IsType <RedirectToActionResult>(result);
Assert.Equal("Role", redirectToActionResult.ControllerName);
Assert.Equal("Index", redirectToActionResult.ActionName);
}