TestService.php

<?php

namespace Drupal\autowire_test;

class TestService {
    
    /**
     * @var \Drupal\autowire_test\TestInjectionInterface
     */
    protected $testInjection;
    
    /**
     * @var \Drupal\autowire_test\TestInjection2
     */
    protected $testInjection2;
    public function __construct(TestInjectionInterface $test_injection, TestInjection2 $test_injection2) {
        $this->testInjection = $test_injection;
        $this->testInjection2 = $test_injection2;
    }
    public function getTestInjection() : TestInjectionInterface {
        return $this->testInjection;
    }
    public function getTestInjection2() : TestInjection2 {
        return $this->testInjection2;
    }

}