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diff --git a/web/core/modules/aggregator/tests/src/Unit/Plugin/AggregatorPluginSettingsBaseTest.php b/web/core/modules/aggregator/tests/src/Unit/Plugin/AggregatorPluginSettingsBaseTest.php
new file mode 100644
index 000000000..926723702
--- /dev/null
+++ b/web/core/modules/aggregator/tests/src/Unit/Plugin/AggregatorPluginSettingsBaseTest.php
@@ -0,0 +1,113 @@
+<?php
+
+namespace Drupal\Tests\aggregator\Unit\Plugin;
+
+use Drupal\aggregator\Form\SettingsForm;
+use Drupal\Core\Form\FormState;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * Tests settings configuration of individual aggregator plugins.
+ *
+ * @group aggregator
+ */
+class AggregatorPluginSettingsBaseTest extends UnitTestCase {
+
+  /**
+   * The aggregator settings form object under test.
+   *
+   * @var \Drupal\aggregator\Form\SettingsForm
+   */
+  protected $settingsForm;
+
+  /**
+   * The stubbed config factory object.
+   *
+   * @var \PHPUnit_Framework_MockObject_MockBuilder
+   */
+  protected $configFactory;
+
+  /**
+   * The stubbed aggregator plugin managers array.
+   *
+   * @var array
+   */
+  protected $managers;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    $this->configFactory = $this->getConfigFactoryStub(
+      [
+        'aggregator.settings' => [
+          'processors' => ['aggregator_test'],
+        ],
+        'aggregator_test.settings' => [],
+      ]
+    );
+    foreach (['fetcher', 'parser', 'processor'] as $type) {
+      $this->managers[$type] = $this->getMockBuilder('Drupal\aggregator\Plugin\AggregatorPluginManager')
+        ->disableOriginalConstructor()
+        ->getMock();
+      $this->managers[$type]->expects($this->once())
+        ->method('getDefinitions')
+        ->will($this->returnValue(['aggregator_test' => ['title' => '', 'description' => '']]));
+    }
+
+    $this->settingsForm = new SettingsForm(
+      $this->configFactory,
+      $this->managers['fetcher'],
+      $this->managers['parser'],
+      $this->managers['processor'],
+      $this->getStringTranslationStub()
+    );
+  }
+
+  /**
+   * Test for AggregatorPluginSettingsBase.
+   *
+   * Ensure that the settings form calls build, validate and submit methods on
+   * plugins that extend AggregatorPluginSettingsBase.
+   */
+  public function testSettingsForm() {
+    // Emulate a form state of a submitted form.
+    $form_state = (new FormState())->setValues([
+      'dummy_length' => '',
+      'aggregator_allowed_html_tags' => '',
+    ]);
+
+    $test_processor = $this->getMock(
+      'Drupal\aggregator_test\Plugin\aggregator\processor\TestProcessor',
+      ['buildConfigurationForm', 'validateConfigurationForm', 'submitConfigurationForm'],
+      [[], 'aggregator_test', ['description' => ''], $this->configFactory]
+    );
+    $test_processor->expects($this->at(0))
+      ->method('buildConfigurationForm')
+      ->with($this->anything(), $form_state)
+      ->will($this->returnArgument(0));
+    $test_processor->expects($this->at(1))
+      ->method('validateConfigurationForm')
+      ->with($this->anything(), $form_state);
+    $test_processor->expects($this->at(2))
+      ->method('submitConfigurationForm')
+      ->with($this->anything(), $form_state);
+
+    $this->managers['processor']->expects($this->once())
+      ->method('createInstance')
+      ->with($this->equalTo('aggregator_test'))
+      ->will($this->returnValue($test_processor));
+
+    $form = $this->settingsForm->buildForm([], $form_state);
+    $this->settingsForm->validateForm($form, $form_state);
+    $this->settingsForm->submitForm($form, $form_state);
+  }
+
+}
+
+// @todo Delete after https://www.drupal.org/node/2278383 is in.
+namespace Drupal\Core\Form;
+
+if (!function_exists('drupal_set_message')) {
+  function drupal_set_message() {}
+}