--- /dev/null
+<?php
+
+namespace Drupal\Tests\image\Kernel\Migrate\d7;
+
+use Drupal\image\Entity\ImageStyle;
+use Drupal\image\ImageStyleInterface;
+use Drupal\image\ImageEffectBase;
+use Drupal\Tests\migrate_drupal\Kernel\d7\MigrateDrupal7TestBase;
+
+/**
+ * Test image styles migration to config entities.
+ *
+ * @group image
+ */
+class MigrateImageStylesTest extends MigrateDrupal7TestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = ['image'];
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp() {
+ parent::setUp();
+ $this->installConfig(static::$modules);
+ $this->executeMigration('d7_image_styles');
+ }
+
+ /**
+ * Test the image styles migration.
+ */
+ public function testImageStylesMigration() {
+ $this->assertEntity('custom_image_style_1', "Custom image style 1", ['image_scale_and_crop', 'image_desaturate'], [['width' => 55, 'height' => 55], []]);
+ $this->assertEntity('custom_image_style_2', "Custom image style 2", ['image_resize', 'image_rotate'], [['width' => 55, 'height' => 100], ['degrees' => 45, 'bgcolor' => '#FFFFFF', 'random' => FALSE]]);
+ $this->assertEntity('custom_image_style_3', "Custom image style 3", ['image_scale', 'image_crop'], [['width' => 150, 'height' => NULL, 'upscale' => FALSE], ['width' => 50, 'height' => 50, 'anchor' => 'left-top']]);
+ }
+
+ /**
+ * Asserts various aspects of an ImageStyle entity.
+ *
+ * @param string $id
+ * The expected image style ID.
+ * @param string $label
+ * The expected image style label.
+ * @param array $expected_effect_plugins
+ * An array of expected plugins attached to the image style entity
+ * @param array $expected_effect_config
+ * An array of expected configuration for each effect in the image style
+ */
+ protected function assertEntity($id, $label, array $expected_effect_plugins, array $expected_effect_config) {
+ $style = ImageStyle::load($id);
+ $this->assertTrue($style instanceof ImageStyleInterface);
+ /** @var \Drupal\image\ImageStyleInterface $style */
+ $this->assertIdentical($id, $style->id());
+ $this->assertIdentical($label, $style->label());
+
+ // Check the number of effects associated with the style.
+ $effects = $style->getEffects();
+ $this->assertIdentical(count($effects), count($expected_effect_plugins));
+
+ $index = 0;
+ foreach ($effects as $effect) {
+ $this->assertTrue($effect instanceof ImageEffectBase);
+ $this->assertIdentical($expected_effect_plugins[$index], $effect->getPluginId());
+ $config = $effect->getConfiguration();
+ $this->assertIdentical($expected_effect_config[$index], $config['data']);
+ $index++;
+ }
+ }
+
+}