未找到Laravel Class BaseController

I'm newbie in laravel. So I've created TestController.php file, inside file:

<?php
class TestController extends BaseController {
public function testFunction()
{
    return "It works";
}
}

In routes:

Route::get('test', 'TestController@testFunction');

I'm got this error:

FatalErrorException in TestController.php line 2: Class 'BaseController' not found

I'm using laravel 5, I'm trying to change from BaseController to Controller, not works :( What's wrong here? Thanks in advance :(

P.S I'm tried change to "\BaseController". Not works.

There is no such thing as a BaseController in Laravel, use Controller instead. BaseController is used once throughout the framework, in the Controller class, but only as a use as alias:

<?php

namespace App\Http\Controllers;

use Illuminate\Foundation\Bus\DispatchesJobs;
use Illuminate\Routing\Controller as BaseController;  // <<< See here - no real class, only an alias
use Illuminate\Foundation\Validation\ValidatesRequests;

abstract class Controller extends BaseController
{
    use DispatchesJobs, ValidatesRequests;
}

Your controller needs this:

<?php namespace App\Http\Controllers;

class TestController extends Controller 
{
    public function testFunction()
    {
        return "It works";
    }
}

Is your TestController in app/Http/Controllers?