setSiteInformation example

$this->drupalLogin($this->adminUser);

    $site_name = 'Name of the site for testing configuration translation';
    $site_slogan = 'Site slogan for testing configuration translation';
    $site_name_label = 'Site name';
    $fr_site_name = 'Nom du site pour tester la configuration traduction';
    $fr_site_slogan = 'Slogan du site pour tester la traduction de configuration';
    $fr_site_name_label = 'Libellé du champ "Nom du site"';
    $translation_base_url = 'admin/config/system/site-information/translate';

    // Set site name and slogan for default language.     $this->setSiteInformation($site_name, $site_slogan);

    $this->drupalGet('admin/config/system/site-information');
    // Check translation tab exist.     $this->assertSession()->linkByHrefExists($translation_base_url);

    $this->drupalGet($translation_base_url);

    // Check that the 'Edit' link in the source language links back to the     // original form.     $this->clickLink('Edit');
    // Also check that saving the form leads back to the translation overview.