HeadersCacheContextTest.php

<?php

namespace Drupal\Tests\Core\Cache\Context;

use Drupal\Core\Cache\Context\HeadersCacheContext;
use Drupal\Tests\UnitTestCase;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\RequestStack;

/**
 * @coversDefaultClass \Drupal\Core\Cache\Context\HeadersCacheContext
 * @group Cache
 */
class HeadersCacheContextTest extends UnitTestCase {
    
    /**
     * @covers ::getContext
     *
     * @dataProvider providerTestGetContext
     */
    public function testGetContext($headers, $header_name, $context) {
        $request_stack = new RequestStack();
        $request = Request::create('/', 'GET');
        // Request defaults could change, so compare with default values instead of
        // passed in context value.
        $request->headers
            ->replace($headers);
        $request_stack->push($request);
        $cache_context = new HeadersCacheContext($request_stack);
        $this->assertSame($cache_context->getContext($header_name), $context);
    }
    
    /**
     * Provides a list of headers and expected cache contexts.
     */
    public function providerTestGetContext() {
        return [
            [
                [],
                NULL,
                '',
            ],
            [
                [],
                'foo',
                '',
            ],
            // Non-empty headers.
[
                [
                    'llama' => 'rocks',
                    'alpaca' => '',
                    'panda' => 'drools',
                    'z' => '0',
                ],
                NULL,
                'alpaca=&llama=rocks&panda=drools&z=0',
            ],
            [
                [
                    'llama' => 'rocks',
                    'alpaca' => '',
                    'panda' => 'drools',
                    'z' => '0',
                ],
                'llama',
                'rocks',
            ],
            [
                [
                    'llama' => 'rocks',
                    'alpaca' => '',
                    'panda' => 'drools',
                    'z' => '0',
                ],
                'alpaca',
                '?valueless?',
            ],
            [
                [
                    'llama' => 'rocks',
                    'alpaca' => '',
                    'panda' => 'drools',
                    'z' => '0',
                ],
                'panda',
                'drools',
            ],
            [
                [
                    'llama' => 'rocks',
                    'alpaca' => '',
                    'panda' => 'drools',
                    'z' => '0',
                ],
                'z',
                '0',
            ],
            [
                [
                    'llama' => 'rocks',
                    'alpaca' => '',
                    'panda' => 'drools',
                    'z' => '0',
                ],
                'chicken',
                '',
            ],
            // Header value could be an array.
[
                [
                    'z' => [
                        '0',
                        '1',
                    ],
                ],
                NULL,
                'z=0,1',
            ],
            // Values are sorted to minimize cache variations.
[
                [
                    'z' => [
                        '1',
                        '0',
                    ],
                    'a' => [],
                ],
                NULL,
                'a=&z=0,1',
            ],
            [
                [
                    'a' => [],
                    'z' => [
                        '1',
                        '0',
                    ],
                ],
                NULL,
                'a=&z=0,1',
            ],
        ];
    }

}