function WebAssert::pageContainsNoDuplicateId

Asserts that each HTML ID is used for just a single element on the page.

Throws

\Behat\Mink\Exception\ExpectationException

File

core/tests/Drupal/Tests/WebAssert.php, line 754

Class

WebAssert

Defines a class with methods for asserting presence of elements during tests.

Namespace

Code

public function pageContainsNoDuplicateId() {
    $seen_ids = [];
    foreach ($this->session
        ->getPage()
        ->findAll('xpath', '//*[@id]') as $element) {
        $id = $element->getAttribute('id');
        if (isset($seen_ids[$id])) {
            throw new ExpectationException(sprintf('The page contains a duplicate HTML ID "%s".', $id), $this->session
                ->getDriver());
        }
        $seen_ids[$id] = TRUE;
    }
}