I'm trying to test a method of a class in my laravel project with mockery.
However, when I attempt to test the phpunit says a my interface class (which is being used in the method I need to test) is not instantiable.
What's wrong?

My test class

class HelperRSTest extends TestCase {

    public function tearDown()
    {
      Mockery::close();
    }

    public function test_mockery()
    {
        // $mock = Mockery::mock('HelperRS');
        // $mock->shouldReceive('getRecibosLocacao')->once()->andReturn('mocked');

        $result = HelperRS::getRecibosLocacao(1228);
        var_dump($result);
    }

}

My target class to test

class HelperRS extends \BaseController {

    public static function getRecibosLocacao($id_locacao){

        $pagamentos = App::make('PagamentoRepositoryInterface');

        $locacao = Locacao::find($id_locacao);
        $pagamento = $pagamentos->getByVendaByTipo($locacao->cod_locacao, 'l');

        dd($pagamento);

    }

}

The error:

1) HelperRSTest::test_mockery
Illuminate\Container\BindingResolutionException: Target [PagamentoRepositoryInterface] is not instantiable.