Unit Testing action hook

I want to perform unit tests on a Class, my goal is: I want to check if the plugin is activated or not by using the function: is_plugin_active

class WC_Custom_Variable_Products_Dependencies {
    public function __construct() {
          add_action( 'admin_init', [$this, 'check_environment']);
    }
    public function check_environment(){
          return is_plugin_active( 
                    'woocommerce-custom-variable-products/woocommerce-custom-variable-products.php' 
                 );
    }
}

CLass de test :

require_once 'class-wc-custom-variable-products-dependencies.php';
class WC_Custom_Variable_Products_DependenciesTest extends WP_UnitTestCase {

    public function setUp() {
        parent::setUp();

        $this-class_instance = new WC_Custom_Variable_Products_Dependencies();
    }

    public function test_check_environment(){

        $result = $this-class_instance-check_environment();
        $this-assertTrue($result);
    }

The assertion return always False .

My plugin is activated, and the function is_plugin_active returns True if I execute it from the browser:

add_action('admin_init', function(){

     var_dump(is_plugin_active( 
                        'woocommerce-custom-variable-products/woocommerce-custom-variable-products.php' 
    ));
});

I think the admin_init hook is not executed in the test. is it true or not?