seeInPage() error with phpunit test

at last, am able to make a post.... happy :),

now here is my challenge:

here is my controller code

    /**
     * process the authentication
     * 
     * @param  Request $request 
     * @return            
     */
    public function postLogin(LoginRequest $request)
    {
        $this->dispatchFrom(AuthenticateCommand::class, $request);

    return redirect()->route('admin.dashboard');    
    }

below is my handler for the logic of the authentication

    public function handle(AuthenticateCommand $command)
    {
        try {
    
            $user = $this->user->findBy('email', $command->email);

            if ( ! Hash::check($command->password, $user->password) )
            {
                throw new PasswordNotCorrectException();                
            }

            $this->auth->login($user);

            return $user;

        } catch (ModelNotFoundException $e) {
            
            throw new UserNotFoundException();
            
        }

    }

here is my auth test

    /** @test */
    public function a_user_may_successfully_login()
    {
        $this->visit('auth/login')
             ->type('email', 'email')
             ->type('password', 'password')
             ->press('Sign in')
                 ->seePageIs(route('admin.dashboard'));
    }

my test for the authentication process keeps failing though if i login manually, my authentication works well. goes to the expected page but my test keeps failing...

here is the error message on from the phpunit test:

1) AuthenticationTest::a_user_may_successfully_login
Did not land on expected page [http://localhost/admin/dashboard].

Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
-'http://localhost/admin/dashboard'
+'http://localhost/auth/login'

/home/vagrant/Code/propertynew/vendor/laravel/framework/src/Illuminate/Foundation/Testing/InteractsWithPages.php:140
/home/vagrant/Code/propertynew/tests/AuthenticationTest.php:35

Pls i need to know what am doing wrong, thanks everyone