diff --git a/tests/src/Kernel/Processor/AddHierarchyTest.php b/tests/src/Kernel/Processor/AddHierarchyTest.php
index 2f1a6d7..d9a52f7 100644
--- a/tests/src/Kernel/Processor/AddHierarchyTest.php
+++ b/tests/src/Kernel/Processor/AddHierarchyTest.php
@@ -211,6 +211,33 @@ public function testPreprocessIndexItemsTaxonomy() {
     $result = $query->execute();
     $expected = array('node' => array(0));
     $this->assertResults($result, $expected);
+
+    // Also add a term with multiple parents.
+    $this->terms['avocado'] = $this->createTerm($this->vocabulary, array(
+      'name' => 'Avocado',
+      'parent' => array($this->terms['fruit']->id(), $this->terms['vegetable']->id()),
+    ));
+    $this->nodes[3] = $this->createNode(array(
+      'type' => 'page',
+      'term_field' => array(
+        'target_id' => $this->terms['avocado']->id(),
+      ),
+    ));
+    $this->index->reindex();
+    $this->index->indexItems();
+
+    // Searching for 'fruit' or 'vegetable' should return this new node.
+    $query = new Query($this->index);
+    $query->addCondition('term_field', $this->terms['fruit']->id());
+    $result = $query->execute();
+    $expected = array('node' => array(2, 3));
+    $this->assertResults($result, $expected);
+
+    $query = new Query($this->index);
+    $query->addCondition('term_field', $this->terms['vegetable']->id());
+    $result = $query->execute();
+    $expected = array('node' => array(0, 1, 3));
+    $this->assertResults($result, $expected);
   }
 
   /**