diff --git a/core/modules/system/src/Tests/Entity/EntityCacheTagsTestBase.php b/core/modules/system/src/Tests/Entity/EntityCacheTagsTestBase.php
index 2326794..ebb7304 100644
--- a/core/modules/system/src/Tests/Entity/EntityCacheTagsTestBase.php
+++ b/core/modules/system/src/Tests/Entity/EntityCacheTagsTestBase.php
@@ -68,7 +68,6 @@ public function setUp() {
     if ($this->entity->getEntityType()->isFieldable()) {
       // Add field, so we can modify the Field and FieldInstance entities to
       // verify that changes to those indeed clear cache tags.
-      $field_name = drupal_strtolower($this->randomName());
       entity_create('field_config', array(
         'name' => 'configurable_field',
         'entity_type' => $this->entity->getEntityTypeId(),
diff --git a/core/modules/system/src/Tests/Form/ElementsTableSelectTest.php b/core/modules/system/src/Tests/Form/ElementsTableSelectTest.php
index 9ce3fb2..5bc8314 100644
--- a/core/modules/system/src/Tests/Form/ElementsTableSelectTest.php
+++ b/core/modules/system/src/Tests/Form/ElementsTableSelectTest.php
@@ -166,11 +166,11 @@ function testMultipleTrueOptionchecker() {
     );
 
     // Test with a valid value.
-    list($processed_form, $form_state, $errors) = $this->formSubmitHelper($form, array('tableselect' => array('row1' => 'row1')));
+    list(, , $errors) = $this->formSubmitHelper($form, array('tableselect' => array('row1' => 'row1')));
     $this->assertFalse(isset($errors['tableselect']), 'Option checker allows valid values for checkboxes.');
 
     // Test with an invalid value.
-    list($processed_form, $form_state, $errors) = $this->formSubmitHelper($form, array('tableselect' => array('non_existing_value' => 'non_existing_value')));
+    list(, , $errors) = $this->formSubmitHelper($form, array('tableselect' => array('non_existing_value' => 'non_existing_value')));
     $this->assertTrue(isset($errors['tableselect']), 'Option checker disallows invalid values for checkboxes.');
 
   }
@@ -191,11 +191,11 @@ function testMultipleFalseOptionchecker() {
     );
 
     // Test with a valid value.
-    list($processed_form, $form_state, $errors) = $this->formSubmitHelper($form, array('tableselect' => 'row1'));
+    list(, , $errors) = $this->formSubmitHelper($form, array('tableselect' => 'row1'));
     $this->assertFalse(isset($errors['tableselect']), 'Option checker allows valid values for radio buttons.');
 
     // Test with an invalid value.
-    list($processed_form, $form_state, $errors) = $this->formSubmitHelper($form, array('tableselect' => 'non_existing_value'));
+    list(, , $errors) = $this->formSubmitHelper($form, array('tableselect' => 'non_existing_value'));
     $this->assertTrue(isset($errors['tableselect']), 'Option checker disallows invalid values for radio buttons.');
   }
 
diff --git a/core/modules/system/tests/src/Controller/SystemControllerTest.php b/core/modules/system/tests/src/Controller/SystemControllerTest.php
index a1cdfaf..199a44f 100644
--- a/core/modules/system/tests/src/Controller/SystemControllerTest.php
+++ b/core/modules/system/tests/src/Controller/SystemControllerTest.php
@@ -125,8 +125,6 @@ public function providerTestSetLinkActiveClass() {
       'language' => 'nl',
       'query' => array(),
     );
-    // Nothing to do.
-    $markup = '<foo>bar</foo>';
     $situations[] = array('context' => $context, 'is active' => FALSE, 'attributes' => array());
     // Matching path, plus all matching variations.
     $attributes = array(
@@ -162,8 +160,6 @@ public function providerTestSetLinkActiveClass() {
       'language' => 'nl',
       'query' => array('foo' => 'bar'),
     );
-    // Nothing to do.
-    $markup = '<foo>bar</foo>';
     $situations[] = array('context' => $context, 'is active' => FALSE, 'attributes' => array());
     // Matching path, plus all matching variations.
     $attributes = array(
@@ -195,8 +191,6 @@ public function providerTestSetLinkActiveClass() {
       'language' => 'nl',
       'query' => array('foo' => 'bar'),
     );
-    // Nothing to do.
-    $markup = '<foo>bar</foo>';
     $situations[] = array('context' => $context, 'is active' => FALSE, 'attributes' => array());
     // Matching path, plus all matching variations.
     $attributes = array(
@@ -232,8 +226,6 @@ public function providerTestSetLinkActiveClass() {
       'language' => 'en',
       'query' => array('foo' => 'bar'),
     );
-    // Nothing to do.
-    $markup = '<foo>bar</foo>';
     $situations[] = array('context' => $context, 'is active' => FALSE, 'attributes' => array());
     // Matching path, plus all matching variations.
     $attributes = array(