public async Task OnGetAsync_ReturnsPageResult_WhenUserUnAuthorized()
{
//Arrange
var authorizationService = new Mock <IAuthorizationService>();
authorizationService.Setup(x => x.AuthorizeAsync(It.IsAny <ClaimsPrincipal>(), It.IsAny <object>(), It.IsAny <IEnumerable <IAuthorizationRequirement> >()))
.ReturnsAsync(AuthorizationResult.Failed());
var store = new Mock <IUserStore <IdentityUser> >();
var mgr = new Mock <UserManager <IdentityUser> >(store.Object, null, null, null, null, null, null, null, null);
var pageModel = new CreateModel(AppDbContext, authorizationService.Object, mgr.Object);
//Act
var result = await pageModel.OnGetAsync();
// Assert
Assert.IsType <ForbidResult>(result);
}