trait RequirementsPageTrait

trait RequirementsPageTrait {
    
    /**
     * 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[] $expected_warnings
     *   A list of warning summaries to expect on the requirements screen (e.g.
     *   'PHP', 'PHP OPcode caching', etc.). If only the expected warnings
     *   are found, the test will click the "continue anyway" link to go to the
     *   next screen of the installer. If an expected warning is not found, or if
     *   a warning not in the list is present, a fail is raised.
     */
    protected function continueOnExpectedWarnings($expected_warnings = []) {
        $this->assertSession()
            ->pageTextNotContains('Errors found');
        $this->assertWarningSummaries($expected_warnings);
        $this->clickLink('continue anyway');
        $this->checkForMetaRefresh();
    }
    
    /**
     * Asserts the given warning summaries are present on the page.
     *
     * If an expected warning is not found, or if a warning not in the list is
     * present, a fail is raised.
     *
     * @param string[] $summaries
     *   A list of warning summaries to expect on the requirements screen (e.g.
     *   'PHP', 'PHP OPcode caching', etc.).
     */
    protected function assertWarningSummaries(array $summaries) {
        $this->assertRequirementSummaries($summaries, 'warning');
    }
    
    /**
     * Asserts the given error summaries are present on the page.
     *
     * If an expected error is not found, or if an error not in the list is
     * present, a fail is raised.
     *
     * @param string[] $summaries
     *   A list of error summaries to expect on the requirements screen (e.g.
     *   'PHP', 'PHP OPcode caching', etc.).
     */
    protected function assertErrorSummaries(array $summaries) {
        $this->assertRequirementSummaries($summaries, 'error');
    }
    
    /**
     * Asserts the given requirements section summaries are present on the page.
     *
     * If an expected requirements message  is not found, or if a message not in
     * the list is present, a fail is raised.
     *
     * @param string[] $summaries
     *   A list of warning summaries to expect on the requirements screen (e.g.
     *   'PHP', 'PHP OPcode caching', etc.).
     * @param string $type
     *   The type of requirement, either 'warning' or 'error'.
     */
    protected function assertRequirementSummaries(array $summaries, string $type) {
        // The selectors are different for Seven and Claro.
        $is_claro = stripos($this->getSession()
            ->getPage()
            ->getContent(), 'claro/css/theme/maintenance-page.css') !== FALSE;
        $selectors = [];
        if ($is_claro) {
            // In Claro each requirement heading is present in a div with the class
            // system-status-report__status-title. There is one summary element per
            // requirement type and it is adjacent to a div with the class
            // claro-details__wrapper.
            $selectors[] = 'summary#' . $type . '+.claro-details__wrapper .system-status-report__status-title';
        }
        else {
            // Allow only details elements that are directly after the warning/error
            // header or each other. There is no guaranteed wrapper we can rely on
            // across distributions. When there are multiple warnings, the selectors
            // will be:
            // - h3#warning+details summary
            // - h3#warning+details+details summary
            // - etc.
            // For errors, the selectors are the same except that they are h3#error.
            // We add one more selector than expected requirements to confirm that
            // there isn't any other requirement message before clicking the link.
            // @todo Make this more reliable in
            //   https://www.drupal.org/project/drupal/issues/2927345.
            for ($i = 0; $i <= count($summaries); $i++) {
                $selectors[] = 'h3#' . $type . implode('', array_fill(0, $i + 1, '+details')) . ' summary';
            }
        }
        $elements = $this->cssSelect(implode(', ', $selectors));
        // Confirm that there are only the expected requirements.
        $requirements = [];
        foreach ($elements as $requirement) {
            $requirements[] = trim($requirement->getText());
        }
        $this->assertEquals($summaries, $requirements);
    }

}