diff --git a/core/tests/Drupal/Tests/Core/Access/CsrfTokenGeneratorTest.php b/core/tests/Drupal/Tests/Core/Access/CsrfTokenGeneratorTest.php
index 5fe2570..ca8c59d 100644
--- a/core/tests/Drupal/Tests/Core/Access/CsrfTokenGeneratorTest.php
+++ b/core/tests/Drupal/Tests/Core/Access/CsrfTokenGeneratorTest.php
@@ -99,7 +99,7 @@ public function testValidate() {
    */
   public function testValidateParameterTypes($token, $value) {
     // Ensure that there is a valid token seed on the session.
-    $ignored_token = $this->generator->get();
+    $this->generator->get();
 
     // The following check might throw PHP fatals and notices, so we disable
     // error assertions.
@@ -135,7 +135,7 @@ public function providerTestValidateParameterTypes() {
    */
   public function testInvalidParameterTypes($token, $value = '') {
     // Ensure that there is a valid token seed on the session.
-    $ignored_token = $this->generator->get();
+    $this->generator->get();
 
     $this->generator->validate($token, $value);
   }
diff --git a/core/tests/Drupal/Tests/Core/Asset/CssCollectionRendererUnitTest.php b/core/tests/Drupal/Tests/Core/Asset/CssCollectionRendererUnitTest.php
index 95e3cc4..6cd69c6 100644
--- a/core/tests/Drupal/Tests/Core/Asset/CssCollectionRendererUnitTest.php
+++ b/core/tests/Drupal/Tests/Core/Asset/CssCollectionRendererUnitTest.php
@@ -153,9 +153,7 @@ function setUp() {
    *
    * @see testRender
    */
-
   function providerTestRender() {
-
     $create_link_element = function($href, $media = 'all', $browsers = array()) {
       return array(
         '#type' => 'html_tag',
diff --git a/core/tests/Drupal/Tests/Core/Menu/LocalTaskIntegrationTest.php b/core/tests/Drupal/Tests/Core/Menu/LocalTaskIntegrationTest.php
index 8ab7bb6..0069d15 100644
--- a/core/tests/Drupal/Tests/Core/Menu/LocalTaskIntegrationTest.php
+++ b/core/tests/Drupal/Tests/Core/Menu/LocalTaskIntegrationTest.php
@@ -63,7 +63,6 @@ protected function getLocalTaskManager($module_dirs, $route_name, $route_params)
     $property->setValue($manager, $controllerResolver);
 
     // todo mock a request with a route.
-    $request = $this->getMock('Symfony\Component\HttpFoundation\Request');
     $request_stack = new RequestStack();
     $property = new \ReflectionProperty('Drupal\Core\Menu\LocalTaskManager', 'requestStack');
     $property->setAccessible(TRUE);
diff --git a/core/tests/Drupal/Tests/Core/Plugin/Discovery/DerivativeDiscoveryDecoratorTest.php b/core/tests/Drupal/Tests/Core/Plugin/Discovery/DerivativeDiscoveryDecoratorTest.php
index 35f9257..c22c201 100644
--- a/core/tests/Drupal/Tests/Core/Plugin/Discovery/DerivativeDiscoveryDecoratorTest.php
+++ b/core/tests/Drupal/Tests/Core/Plugin/Discovery/DerivativeDiscoveryDecoratorTest.php
@@ -84,7 +84,7 @@ public function testGetDerivativeFetcherWithAnnotationObjects() {
       ->will($this->returnValue($definitions));
 
     $discovery = new DerivativeDiscoveryDecorator($this->discoveryMain);
-    $discovery->getDefinitions();
+    $definitions = $discovery->getDefinitions();
 
     // Ensure that both test derivatives got added.
     $this->assertEquals(2, count($definitions));