How proper unit test

Hello

So, I have problem with testing.

Firstly - yes I read Testing Section in CI4 Docs

When I run simply "phpunit" in CI4 directory I have error:

Class `CodeIgniter\Test\CIUnitTestCase` not found in (...)\tests\_support\CIUnitTestCase.php on line 5

What's wrong? Composer update run with no-complications.

All works fine for me.

composer create-project codeigniter4/framework:dev-develop mysuperapp
cd mysuperapp && composer install
ln -s ./vendor/bin/phpunit ./phpunit

Create the file tests/TestFoo.php:

PHP Code:

<?php

class TestFoo extends \CodeIgniter\Test\CIUnitTestCase
{
    /**
     * @test
     */
    public function testBar()
    {
        $this->assertEquals(1, 2);
    }
} 


Execute the test with this command:

Code:

./phpunit tests/TestFoo.php --filter bar