UpdateReportTest.php

<?php

namespace Drupal\Tests\update\Kernel;

use Drupal\KernelTests\KernelTestBase;

/**
 * Tests update report functionality.
 *
 * @covers template_preprocess_update_report()
 * @group update
 */
class UpdateReportTest extends KernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'system',
        'update',
    ];
    
    /**
     * @dataProvider providerTemplatePreprocessUpdateReport
     */
    public function testTemplatePreprocessUpdateReport($variables) {
        \Drupal::moduleHandler()->loadInclude('update', 'inc', 'update.report');
        // The function should run without an exception being thrown when the value
        // of $variables['data'] is not set or is not an array.
        template_preprocess_update_report($variables);
        // Test that the key "no_updates_message" has been set.
        $this->assertArrayHasKey('no_updates_message', $variables);
    }
    
    /**
     * Provides data for testTemplatePreprocessUpdateReport().
     *
     * @return array
     *   Array of $variables for template_preprocess_update_report().
     */
    public function providerTemplatePreprocessUpdateReport() {
        return [
            '$variables with data not set' => [
                [],
            ],
            '$variables with data as an interger' => [
                [
                    'data' => 4,
                ],
            ],
            '$variables with data as a string' => [
                [
                    'data' => 'I am a string',
                ],
            ],
        ];
    }

}