ChainedPlaceholderStrategyTest.php

<?php

namespace Drupal\Tests\Core\Render\Placeholder;

use Drupal\Core\Render\Placeholder\ChainedPlaceholderStrategy;
use Drupal\Tests\UnitTestCase;

/**
 * @coversDefaultClass \Drupal\Core\Render\Placeholder\ChainedPlaceholderStrategy
 * @group Render
 */
class ChainedPlaceholderStrategyTest extends UnitTestCase {
    
    /**
     * @covers ::addPlaceholderStrategy
     * @covers ::processPlaceholders
     *
     * @dataProvider providerProcessPlaceholders
     */
    public function testProcessPlaceholders($strategies, $placeholders, $result) {
        $chained_placeholder_strategy = new ChainedPlaceholderStrategy();
        foreach ($strategies as $strategy) {
            $chained_placeholder_strategy->addPlaceholderStrategy($strategy);
        }
        $this->assertEquals($result, $chained_placeholder_strategy->processPlaceholders($placeholders));
    }
    
    /**
     * Provides a list of render strategies, placeholders and results.
     *
     * @return array
     */
    public function providerProcessPlaceholders() {
        $data = [];
        // Empty placeholders.
        $data['empty placeholders'] = [
            [],
            [],
            [],
        ];
        // Placeholder removing strategy.
        $placeholders = [
            'remove-me' => [
                '#markup' => 'I-am-a-llama-that-will-be-removed-sad-face.',
            ],
        ];
        $prophecy = $this->prophesize('\\Drupal\\Core\\Render\\Placeholder\\PlaceholderStrategyInterface');
        $prophecy->processPlaceholders($placeholders)
            ->willReturn([]);
        $dev_null_strategy = $prophecy->reveal();
        $data['placeholder removing strategy'] = [
            [
                $dev_null_strategy,
            ],
            $placeholders,
            [],
        ];
        // Fake Single Flush strategy.
        $placeholders = [
            '67890' => [
                '#markup' => 'special-placeholder',
            ],
        ];
        $prophecy = $this->prophesize('\\Drupal\\Core\\Render\\Placeholder\\PlaceholderStrategyInterface');
        $prophecy->processPlaceholders($placeholders)
            ->willReturn($placeholders);
        $single_flush_strategy = $prophecy->reveal();
        $data['fake single flush strategy'] = [
            [
                $single_flush_strategy,
            ],
            $placeholders,
            $placeholders,
        ];
        // Fake ESI strategy.
        $placeholders = [
            '12345' => [
                '#markup' => 'special-placeholder-for-esi',
            ],
        ];
        $result = [
            '12345' => [
                '#markup' => '<esi:include src="/fragment/12345" />',
            ],
        ];
        $prophecy = $this->prophesize('\\Drupal\\Core\\Render\\Placeholder\\PlaceholderStrategyInterface');
        $prophecy->processPlaceholders($placeholders)
            ->willReturn($result);
        $esi_strategy = $prophecy->reveal();
        $data['fake esi strategy'] = [
            [
                $esi_strategy,
            ],
            $placeholders,
            $result,
        ];
        // ESI + SingleFlush strategy (ESI replaces all).
        $prophecy = $this->prophesize('\\Drupal\\Core\\Render\\Placeholder\\PlaceholderStrategyInterface');
        $prophecy->processPlaceholders($placeholders)
            ->willReturn($result);
        $esi_strategy = $prophecy->reveal();
        $prophecy = $this->prophesize('\\Drupal\\Core\\Render\\Placeholder\\PlaceholderStrategyInterface');
        $prophecy->processPlaceholders($placeholders)
            ->shouldNotBeCalled();
        $prophecy->processPlaceholders($result)
            ->shouldNotBeCalled();
        $prophecy->processPlaceholders([])
            ->shouldNotBeCalled();
        $single_flush_strategy = $prophecy->reveal();
        $data['fake esi and single_flush strategy - esi replaces all'] = [
            [
                $esi_strategy,
                $single_flush_strategy,
            ],
            $placeholders,
            $result,
        ];
        // ESI + SingleFlush strategy (mixed).
        $placeholders = [
            '12345' => [
                '#markup' => 'special-placeholder-for-ESI',
            ],
            '67890' => [
                '#markup' => 'special-placeholder',
            ],
            'foo' => [
                '#markup' => 'bar',
            ],
        ];
        $esi_result = [
            '12345' => [
                '#markup' => '<esi:include src="/fragment/12345" />',
            ],
        ];
        $normal_result = [
            '67890' => [
                '#markup' => 'special-placeholder',
            ],
            'foo' => [
                '#markup' => 'bar',
            ],
        ];
        $result = $esi_result + $normal_result;
        $prophecy = $this->prophesize('\\Drupal\\Core\\Render\\Placeholder\\PlaceholderStrategyInterface');
        $prophecy->processPlaceholders($placeholders)
            ->willReturn($esi_result);
        $esi_strategy = $prophecy->reveal();
        $prophecy = $this->prophesize('\\Drupal\\Core\\Render\\Placeholder\\PlaceholderStrategyInterface');
        $prophecy->processPlaceholders($normal_result)
            ->willReturn($normal_result);
        $single_flush_strategy = $prophecy->reveal();
        $data['fake esi and single_flush strategy - mixed'] = [
            [
                $esi_strategy,
                $single_flush_strategy,
            ],
            $placeholders,
            $result,
        ];
        return $data;
    }
    
    /**
     * @covers ::processPlaceholders
     */
    public function testProcessPlaceholdersNoStrategies() {
        // Placeholders but no strategies defined.
        $placeholders = [
            'assert-me' => [
                '#markup' => 'I-am-a-llama-that-will-lead-to-an-assertion-by-the-chained-placeholder-strategy.',
            ],
        ];
        $chained_placeholder_strategy = new ChainedPlaceholderStrategy();
        $this->expectException(\AssertionError::class);
        $this->expectExceptionMessage('At least one placeholder strategy must be present; by default the fallback strategy \\Drupal\\Core\\Render\\Placeholder\\SingleFlushStrategy is always present.');
        $chained_placeholder_strategy->processPlaceholders($placeholders);
    }
    
    /**
     * @covers ::processPlaceholders
     */
    public function testProcessPlaceholdersWithRoguePlaceholderStrategy() {
        // Placeholders but no strategies defined.
        $placeholders = [
            'assert-me' => [
                '#markup' => 'llama',
            ],
        ];
        $result = [
            'assert-me' => [
                '#markup' => 'llama',
            ],
            'new-placeholder' => [
                '#markup' => 'rogue llama',
            ],
        ];
        $prophecy = $this->prophesize('\\Drupal\\Core\\Render\\Placeholder\\PlaceholderStrategyInterface');
        $prophecy->processPlaceholders($placeholders)
            ->willReturn($result);
        $rogue_strategy = $prophecy->reveal();
        $chained_placeholder_strategy = new ChainedPlaceholderStrategy();
        $chained_placeholder_strategy->addPlaceholderStrategy($rogue_strategy);
        $this->expectException(\AssertionError::class);
        $this->expectExceptionMessage('Processed placeholders must be a subset of all placeholders.');
        $chained_placeholder_strategy->processPlaceholders($placeholders);
    }

}