Issue #3106659 by phenaproxima, aleevas, rajanvalecha12, Drupaldev2013,...

        ->getViewDisplay('media', $type->id());

      $source_field_definition = $type->getSource()->getSourceFieldDefinition($type);

      if (!is_a($source_field_definition->getItemDefinition()->getClass(), ImageItem::class, TRUE)) {

      if (empty($source_field_definition) || !is_a($source_field_definition->getItemDefinition()->getClass(), ImageItem::class, TRUE)) {

        continue;

      }

<?php

namespace Drupal\Tests\media\Functional;

/**

 * Tests the Media module's requirements checks.

 *

 * @group media

 */

class MediaRequirementsTest extends MediaFunctionalTestBase {

  /**

   * {@inheritdoc}

   */

  protected $defaultTheme = 'stark';

  /**

   * Tests that the requirements check can handle a missing source field.

   */

  public function testMissingSourceFieldDefinition() {

    $media_type = $this->createMediaType('test');

    /** @var \Drupal\field\FieldConfigInterface $field_definition */

    $field_definition = $media_type->getSource()

      ->getSourceFieldDefinition($media_type);

    /** @var \Drupal\field\FieldStorageConfigInterface $field_storage_definition */

    $field_storage_definition = $field_definition->getFieldStorageDefinition();

    $field_definition->delete();

    $field_storage_definition->delete();

    $this->drupalLogin($this->rootUser);

    $this->drupalGet('/admin/reports/status');

    $this->assertSession()->statusCodeEquals(200);

  }

}