--- /dev/null
+<?php
+
+namespace Drupal\Tests\image\Functional\Update;
+
+use Drupal\FunctionalTests\Update\UpdatePathTestBase;
+
+/**
+ * Tests adding an 'anchor' setting to existing scale and crop image effects.
+ *
+ * @see image_post_update_scale_and_crop_effect_add_anchor()
+ *
+ * @group Update
+ * @group legacy
+ */
+class ScaleAndCropAddAnchorUpdateTest extends UpdatePathTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setDatabaseDumpFiles() {
+ $this->databaseDumpFiles = [
+ __DIR__ . '/../../../../../system/tests/fixtures/update/drupal-8.4.0.bare.standard.php.gz',
+ __DIR__ . '/../../../fixtures/update/test_scale_and_crop_add_anchor.php',
+ ];
+ }
+
+ /**
+ * Tests that 'anchor' setting is properly added.
+ */
+ public function testImagePostUpdateScaleAndCropEffectAddAnchor() {
+ // Test that the first effect does not have an 'anchor' setting.
+ $effect_data = $this->config('image.style.test_scale_and_crop_add_anchor')->get('effects.8c7170c9-5bcc-40f9-8698-f88a8be6d434.data');
+ $this->assertFalse(array_key_exists('anchor', $effect_data));
+
+ // Test that the second effect has an 'anchor' setting.
+ $effect_data = $this->config('image.style.test_scale_and_crop_add_anchor')->get('effects.a8d83b12-abc6-40c8-9c2f-78a4e421cf97.data');
+ $this->assertTrue(array_key_exists('anchor', $effect_data));
+
+ // Test that the third effect does not have an 'anchor' setting.
+ $effect_data = $this->config('image.style.test_scale_and_crop_add_anchor')->get('effects.1bffd475-19d0-439a-b6a1-7e5850ce40f9.data');
+ $this->assertFalse(array_key_exists('anchor', $effect_data));
+
+ $this->runUpdates();
+
+ // Test that the first effect now has an 'anchor' setting.
+ $effect_data = $this->config('image.style.test_scale_and_crop_add_anchor')->get('effects.8c7170c9-5bcc-40f9-8698-f88a8be6d434.data');
+ $this->assertTrue(array_key_exists('anchor', $effect_data));
+ $this->assertEquals('center-center', $effect_data['anchor']);
+
+ // Test that the second effect's 'anchor' setting is unchanged.
+ $effect_data = $this->config('image.style.test_scale_and_crop_add_anchor')->get('effects.a8d83b12-abc6-40c8-9c2f-78a4e421cf97.data');
+ $this->assertTrue(array_key_exists('anchor', $effect_data));
+ $this->assertEquals('left-top', $effect_data['anchor']);
+
+ // Test that the third effect still does not have an 'anchor' setting.
+ $effect_data = $this->config('image.style.test_scale_and_crop_add_anchor')->get('effects.1bffd475-19d0-439a-b6a1-7e5850ce40f9.data');
+ $this->assertFalse(array_key_exists('anchor', $effect_data));
+ }
+
+}