function HtmlResponseAttachmentsTest::assertHead

Helper function to make assertions about HTML head elements.

@internal

File

core/modules/system/tests/src/Functional/Render/HtmlResponseAttachmentsTest.php, line 145

Class

HtmlResponseAttachmentsTest

Functional tests for HtmlResponseAttachmentsProcessor.

Namespace

Code

protected function assertHead() : void {
    // Discover the DOM element for the meta link.
    $test_meta = $this->xpath('//head/meta[@test-attribute="testvalue"]');
    $this->assertCount(1, $test_meta, 'There\'s only one test attribute.');
    // Grab the only DOM element.
    $test_meta = reset($test_meta);
    if (empty($test_meta)) {
        $this->fail('Unable to find the head meta.');
    }
    else {
        $this->assertEquals('testvalue', $test_meta->getAttribute('test-attribute'));
    }
}