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;
  }

}