+<?php
+
+namespace Drupal\Tests\field\Unit\Plugin\migrate\process\d7;
+
+use Drupal\field\Plugin\migrate\process\d7\FieldInstanceSettings;
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\Row;
+use Drupal\Tests\migrate\Unit\MigrateTestCase;
+
+/**
+ * @coversDefaultClass \Drupal\field\Plugin\migrate\process\d7\FieldInstanceSettings
+ * @group field
+ */
+class FieldInstanceSettingsTest extends MigrateTestCase {
+
+ /**
+ * Tests transformation of image field settings.
+ *
+ * @covers ::transform
+ */
+ public function testTransformImageSettings() {
+ $migration = $this->getMock(MigrationInterface::class);
+ $plugin = new FieldInstanceSettings([], 'd7_field_instance_settings', [], $migration);
+
+ $executable = $this->getMock(MigrateExecutableInterface::class);
+ $row = $this->getMockBuilder(Row::class)
+ ->disableOriginalConstructor()
+ ->getMock();
+
+ $value = $plugin->transform([[], ['type' => 'image_image'], []], $executable, $row, 'foo');
+ $this->assertInternalType('array', $value['default_image']);
+ $this->assertSame('', $value['default_image']['alt']);
+ $this->assertSame('', $value['default_image']['title']);
+ $this->assertNull($value['default_image']['width']);
+ $this->assertNull($value['default_image']['height']);
+ $this->assertSame('', $value['default_image']['uuid']);
+ }
+
+}