assertWarningSummaries example

/** * Handles the update requirements page. */
  protected function updateRequirementsProblem() {
    // Assert a warning is shown on older test environments.     $links = $this->getSession()->getPage()->findAll('named', ['link', 'try again']);

    // Get the default Drupal core PHP requirements.     if ($links && version_compare(phpversion(), PhpRequirements::getMinimumSupportedPhp()) < 0) {
      $this->assertSession()->pageTextNotContains('Errors found');
      $this->assertWarningSummaries(['PHP']);
      $this->clickLink('try again');
      $this->checkForMetaRefresh();
    }
  }

  /** * Continues installation when the expected warnings are found. * * @param string[] $expected_warnings * A list of warning summaries to expect on the requirements screen (e.g. * 'PHP', 'PHP OPcode caching', etc.). If only the expected warnings * are found, the test will click the "continue anyway" link to go to the * next screen of the installer. If an expected warning is not found, or if * a warning not in the list is present, a fail is raised. */