--- /dev/null
+<?php
+
+namespace Drupal\Tests\file\Unit\Plugin\migrate\field\d6;
+
+use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\Tests\UnitTestCase;
+use Drupal\file\Plugin\migrate\field\d6\ImageField;
+use Prophecy\Argument;
+
+/**
+ * @coversDefaultClass \Drupal\file\Plugin\migrate\field\d6\ImageField
+ * @group file
+ * @group legacy
+ */
+class ImageFieldTest extends UnitTestCase {
+
+ /**
+ * @var \Drupal\migrate_drupal\Plugin\MigrateFieldInterface
+ */
+ protected $plugin;
+
+ /**
+ * @var \Drupal\migrate\Plugin\MigrationInterface
+ */
+ protected $migration;
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp() {
+ $this->plugin = new ImageField([], 'image', []);
+
+ $migration = $this->prophesize(MigrationInterface::class);
+
+ // The plugin's processFieldValues() method will call
+ // mergeProcessOfProperty() and return nothing. So, in order to examine the
+ // process pipeline created by the plugin, we need to ensure that
+ // getProcess() always returns the last input to mergeProcessOfProperty().
+ $migration->mergeProcessOfProperty(Argument::type('string'), Argument::type('array'))
+ ->will(function ($arguments) use ($migration) {
+ $migration->getProcess()->willReturn($arguments[1]);
+ });
+ $this->migration = $migration->reveal();
+ }
+
+ /**
+ * @covers ::processFieldValues
+ * @expectedDeprecation ImageField is deprecated in Drupal 8.5.x and will be removed before Drupal 9.0.x. Use \Drupal\image\Plugin\migrate\field\d6\ImageField instead. See https://www.drupal.org/node/2936061.
+ */
+ public function testProcessFieldValues() {
+ $this->plugin->processFieldValues($this->migration, 'somefieldname', []);
+
+ $expected = [
+ 'plugin' => 'd6_field_file',
+ 'source' => 'somefieldname',
+ ];
+ $this->assertSame($expected, $this->migration->getProcess());
+ }
+
+}