only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/views/lib/Drupal/views/Tests/Handler/FilterCompareUiTest.php
@@ -0,0 +1,78 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\views\Tests\Handler\FilterCompareUiTest.
+ */
+
+namespace Drupal\views\Tests\Handler;
+
+use Drupal\views\Views;
+use Drupal\views_ui\Tests\UITestBase;
+
+/**
+ * Tests the combine filter handler UI.
+ *
+ * @see \Drupal\views\Plugin\views\filter\Compare
+ */
+class FilterCompareUiTest extends UITestBase {
+
+  /**
+   * The column map used in the test.
+   *
+   * @var array
+   */
+  protected $columnMap = array(
+    'views_test_data_name' => 'name',
+  );
+
+  /**
+   * Views used by this test.
+  );
+
+  /**
+   * Views used by this test.
+   *
+   * @var array
+   */
+  public static $testViews = array('test_filter_compare');
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Filter: Compare UI',
+      'description' => 'Tests the compare filter handler UI.',
+      'group' => 'Views Handlers',
+    );
+  }
+
+  /**
+   * Tests the compare handler.
+   */
+  public function testCompare() {
+    $this->drupalGet('admin/structure/views/nojs/config-item/test_filter_compare/default/filter/fields_compare');
+
+    $left_field = $this->xpath('//select[@name="options[left_field]"]/option');
+    $right_field = $this->xpath('//select[@name="options[right_field]"]/option');
+
+    // Ensure available options.
+    $this->assertEqual((string) $left_field[0]['value'], 'created');
+    $this->assertEqual((string) $right_field[0]['value'], 'created');
+    $this->assertEqual((string) $left_field[1]['value'], 'age');
+    $this->assertEqual((string) $right_field[1]['value'], 'age');
+    $this->assertEqual((string) $left_field[2]['value'], 'name');
+    $this->assertEqual((string) $right_field[2]['value'], 'name');
+
+    $edit = array();
+    $edit['options[left_field]'] = 'name';
+    $edit['options[right_field]'] = 'age';
+
+    $this->drupalPostForm(NULL, $edit, t('Apply'));
+    $this->drupalPostForm(NULL, array(), t('Save'));
+
+    $view = \Drupal::entityManager()->getStorageController('view')->load('test_filter_compare');
+    $display = $view->getDisplay('default');
+    $this->assertEqual($display['display_options']['filters']['fields_compare']['left_field'], 'name');
+    $this->assertEqual($display['display_options']['filters']['fields_compare']['right_field'], 'age');
+  }
+
+}