diff --git a/tests/src/Kernel/DependencyRemovalTest.php b/tests/src/Kernel/DependencyRemovalTest.php
index 2619ae5..1fc3c9c 100644
--- a/tests/src/Kernel/DependencyRemovalTest.php
+++ b/tests/src/Kernel/DependencyRemovalTest.php
@@ -287,16 +287,14 @@ class DependencyRemovalTest extends KernelTestBase {
     // server.
     $dependency_key = $this->dependency->getConfigDependencyKey();
     $dependency_name = $this->dependency->getConfigDependencyName();
-    $this->index->set('processor_settings', array(
-      'search_api_test_dependencies' => array(
-        'plugin_id' => 'search_api_test_dependencies',
-        'settings' => array(
-          $dependency_key => array(
-            $dependency_name,
-          ),
-        ),
-      ),
-    ));
+
+    $processor = \Drupal::getContainer()
+      ->get('plugin.manager.search_api.processor')
+      ->createInstance(
+        'search_api_test_dependencies',
+        array($dependency_key => array($dependency_name))
+      );
+    $this->index->addProcessor($processor);
     $this->index->save();
 
     // Check the dependencies were calculated correctly.
@@ -323,10 +321,10 @@ class DependencyRemovalTest extends KernelTestBase {
 
     // Depending on whether the plugin should have removed the dependency or
     // not, make sure the right action was taken.
-    $processors = $this->index->get('processor_settings');
+    $processors = $this->index->getProcessors();
     if ($remove_dependency) {
       $this->assertArrayHasKey('search_api_test_dependencies', $processors, 'Processor not removed');
-      $this->assertEmpty($processors['search_api_test_dependencies']['settings'], 'Processor settings adapted');
+      $this->assertEmpty($processors['search_api_test_dependencies']->getConfiguration(), 'Processor settings adapted');
     }
     else {
       $this->assertArrayNotHasKey('search_api_test_dependencies', $processors, 'Processor removed');
@@ -418,12 +416,12 @@ class DependencyRemovalTest extends KernelTestBase {
         'settings' => array(),
       ),
     ));
-    $this->index->set('processor_settings', array(
-      'search_api_test_dependencies' => array(
-        'plugin_id' => 'search_api_test_dependencies',
-        'settings' => array(),
-      ),
-    ));
+
+    $processor = \Drupal::getContainer()
+      ->get('plugin.manager.search_api.processor')
+      ->createInstance('search_api_test_dependencies');
+    $this->index->addProcessor($processor);
+
     $tracker = \Drupal::getContainer()
       ->get('plugin.manager.search_api.tracker')
       ->createInstance('search_api_test_dependencies');