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diff --git a/web/core/tests/Drupal/FunctionalTests/Image/ToolkitTestBase.php b/web/core/tests/Drupal/FunctionalTests/Image/ToolkitTestBase.php
new file mode 100644
index 000000000..cf024e26e
--- /dev/null
+++ b/web/core/tests/Drupal/FunctionalTests/Image/ToolkitTestBase.php
@@ -0,0 +1,159 @@
+<?php
+
+namespace Drupal\FunctionalTests\Image;
+
+use Drupal\Component\Utility\SafeMarkup;
+use Drupal\Tests\BrowserTestBase;
+use Drupal\Tests\TestFileCreationTrait;
+
+
+/**
+ * Base class for image manipulation testing.
+ */
+abstract class ToolkitTestBase extends BrowserTestBase {
+
+  use TestFileCreationTrait {
+    getTestFiles as drupalGetTestFiles;
+  }
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['image_test'];
+
+  /**
+   * The URI for the file.
+   *
+   * @var string
+   */
+  protected $file;
+
+  /**
+   * The image factory service.
+   *
+   * @var \Drupal\Core\Image\ImageFactory
+   */
+  protected $imageFactory;
+
+  /**
+   * The image object for the test file.
+   *
+   * @var \Drupal\Core\Image\ImageInterface
+   */
+  protected $image;
+
+  protected function setUp() {
+    parent::setUp();
+
+    // Set the image factory service.
+    $this->imageFactory = $this->container->get('image.factory');
+
+    // Pick a file for testing.
+    $file = current($this->drupalGetTestFiles('image'));
+    $this->file = $file->uri;
+
+    // Setup a dummy image to work with.
+    $this->image = $this->getImage();
+
+    // Clear out any hook calls.
+    $this->imageTestReset();
+  }
+
+  /**
+   * Sets up an image with the custom toolkit.
+   *
+   * @return \Drupal\Core\Image\ImageInterface
+   *   The image object.
+   */
+  protected function getImage() {
+    $image = $this->imageFactory->get($this->file, 'test');
+    $this->assertTrue($image->isValid(), 'Image file was parsed.');
+    return $image;
+  }
+
+  /**
+   * Assert that all of the specified image toolkit operations were called
+   * exactly once once, other values result in failure.
+   *
+   * @param $expected
+   *   Array with string containing with the operation name, e.g. 'load',
+   *   'save', 'crop', etc.
+   */
+  public function assertToolkitOperationsCalled(array $expected) {
+    // If one of the image operations is expected, apply should be expected as
+    // well.
+    $operations = [
+      'resize',
+      'rotate',
+      'crop',
+      'desaturate',
+      'create_new',
+      'scale',
+      'scale_and_crop',
+      'my_operation',
+      'convert',
+    ];
+    if (count(array_intersect($expected, $operations)) > 0 && !in_array('apply', $expected)) {
+      $expected[] = 'apply';
+    }
+
+    // Determine which operations were called.
+    $actual = array_keys(array_filter($this->imageTestGetAllCalls()));
+
+    // Determine if there were any expected that were not called.
+    $uncalled = array_diff($expected, $actual);
+    if (count($uncalled)) {
+      $this->assertTrue(FALSE, SafeMarkup::format('Expected operations %expected to be called but %uncalled was not called.', ['%expected' => implode(', ', $expected), '%uncalled' => implode(', ', $uncalled)]));
+    }
+    else {
+      $this->assertTrue(TRUE, SafeMarkup::format('All the expected operations were called: %expected', ['%expected' => implode(', ', $expected)]));
+    }
+
+    // Determine if there were any unexpected calls.
+    // If all unexpected calls are operations and apply was expected, we do not
+    // count it as an error.
+    $unexpected = array_diff($actual, $expected);
+    if (count($unexpected) && (!in_array('apply', $expected) || count(array_intersect($unexpected, $operations)) !== count($unexpected))) {
+      $this->assertTrue(FALSE, SafeMarkup::format('Unexpected operations were called: %unexpected.', ['%unexpected' => implode(', ', $unexpected)]));
+    }
+    else {
+      $this->assertTrue(TRUE, 'No unexpected operations were called.');
+    }
+  }
+
+  /**
+   * Resets/initializes the history of calls to the test toolkit functions.
+   */
+  protected function imageTestReset() {
+    // Keep track of calls to these operations
+    $results = [
+      'parseFile' => [],
+      'save' => [],
+      'settings' => [],
+      'apply' => [],
+      'resize' => [],
+      'rotate' => [],
+      'crop' => [],
+      'desaturate' => [],
+      'create_new' => [],
+      'scale' => [],
+      'scale_and_crop' => [],
+      'convert' => [],
+    ];
+    \Drupal::state()->set('image_test.results', $results);
+  }
+
+  /**
+   * Gets an array of calls to the test toolkit.
+   *
+   * @return array
+   *   An array keyed by operation name ('parseFile', 'save', 'settings',
+   *   'resize', 'rotate', 'crop', 'desaturate') with values being arrays of
+   *   parameters passed to each call.
+   */
+  protected function imageTestGetAllCalls() {
+    return \Drupal::state()->get('image_test.results') ?: [];
+  }
+
+}