getGeneratedLink example

new GeneratedUrl())->setGeneratedUrl('/test-route-1'),
        ],
      ]);

    $url = new Url('test_route_1');
    $url->setUrlGenerator($this->urlGenerator);
    $expected_link_markup = '<a href="/test-route-1">Test</a>';

    // Test ::generate().     $this->assertSame($expected_link_markup, (string) $this->linkGenerator->generate('Test', $url));
    $generated_link = $this->linkGenerator->generate('Test', $url);
    $this->assertSame($expected_link_markup, (string) $generated_link->getGeneratedLink());
    $this->assertInstanceOf('\Drupal\Core\Render\BubbleableMetadata', $generated_link);

    // Test ::generateFromLink().     $this->expectDeprecation('\Drupal\Core\Utility\LinkGeneratorInterface::generateFromLink() is deprecated in drupal:10.1.0 and is removed from drupal:11.0.0. Use \Drupal\Core\Utility\LinkGeneratorInterface::generate() instead. See https://www.drupal.org/node/3342992');
    $link = new Link('Test', $url);
    $this->assertSame($expected_link_markup, (string) $this->linkGenerator->generateFromLink($link));
    $generated_link = $this->linkGenerator->generateFromLink($link);
    $this->assertSame($expected_link_markup, (string) $generated_link->getGeneratedLink());
    $this->assertInstanceOf('\Drupal\Core\Render\BubbleableMetadata', $generated_link);
  }