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diff --git a/web/core/modules/migrate/tests/src/Unit/process/SubProcessTest.php b/web/core/modules/migrate/tests/src/Unit/process/SubProcessTest.php
new file mode 100644
index 000000000..dfcdec3bc
--- /dev/null
+++ b/web/core/modules/migrate/tests/src/Unit/process/SubProcessTest.php
@@ -0,0 +1,82 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\process;
+
+use Drupal\migrate\MigrateExecutable;
+use Drupal\migrate\Plugin\migrate\process\Get;
+use Drupal\migrate\Plugin\migrate\process\SubProcess;
+use Drupal\migrate\Row;
+use Drupal\Tests\migrate\Unit\MigrateTestCase;
+
+/**
+ * Tests the sub_process process plugin.
+ *
+ * @group migrate
+ */
+class SubProcessTest extends MigrateTestCase {
+
+  /**
+   * The sub_process plugin being tested.
+   *
+   * @var \Drupal\migrate\Plugin\migrate\process\SubProcess
+   */
+  protected $plugin;
+
+  /**
+   * @var array
+   */
+  protected $migrationConfiguration = [
+    'id' => 'test',
+  ];
+
+  /**
+   * Tests the sub_process process plugin.
+   */
+  public function testSubProcess() {
+    $migration = $this->getMigration();
+    // Set up the properties for the sub_process.
+    $configuration = [
+      'process' => [
+        'foo' => 'source_foo',
+        'id' => 'source_id',
+      ],
+      'key' => '@id',
+    ];
+    $plugin = new SubProcess($configuration, 'sub_process', []);
+    // Manually create the plugins. Migration::getProcessPlugins does this
+    // normally but the plugin system is not available.
+    foreach ($configuration['process'] as $destination => $source) {
+      $sub_process_plugins[$destination][] = new Get(['source' => $source], 'get', []);
+    }
+    $migration->expects($this->at(1))
+      ->method('getProcessPlugins')
+      ->willReturn($sub_process_plugins);
+    // Set up the key plugins.
+    $key_plugin['key'][] = new Get(['source' => '@id'], 'get', []);
+    $migration->expects($this->at(2))
+      ->method('getProcessPlugins')
+      ->will($this->returnValue($key_plugin));
+    $event_dispatcher = $this->getMock('Symfony\Component\EventDispatcher\EventDispatcherInterface');
+    $migrate_executable = new MigrateExecutable($migration, $this->getMock('Drupal\migrate\MigrateMessageInterface'), $event_dispatcher);
+
+    // The current value of the pipeline.
+    $current_value = [
+      [
+        'source_foo' => 'test',
+        'source_id' => 42,
+      ],
+    ];
+    // This is not used but the interface requires it, so create an empty row.
+    $row = new Row();
+
+    // After transformation, check to make sure that source_foo and source_id's
+    // values ended up in the proper destinations, and that the value of the
+    // key (@id) is the same as the destination ID (42).
+    $new_value = $plugin->transform($current_value, $migrate_executable, $row, 'test');
+    $this->assertSame(count($new_value), 1);
+    $this->assertSame(count($new_value[42]), 2);
+    $this->assertSame($new_value[42]['foo'], 'test');
+    $this->assertSame($new_value[42]['id'], 42);
+  }
+
+}