diff --git a/core/modules/node/src/Tests/MultiStepNodeFormBasicOptionsTest.php b/core/modules/node/src/Tests/MultiStepNodeFormBasicOptionsTest.php
index 4650bad..f6c5b69 100644
--- a/core/modules/node/src/Tests/MultiStepNodeFormBasicOptionsTest.php
+++ b/core/modules/node/src/Tests/MultiStepNodeFormBasicOptionsTest.php
@@ -20,7 +20,7 @@ class MultiStepNodeFormBasicOptionsTest extends NodeTestBase {
    *
    * @var string
    */
-  protected $field_name;
+  protected $fieldName;
 
   /**
    * Tests changing the default values of basic options to ensure they persist.
@@ -31,9 +31,9 @@ function testMultiStepNodeFormBasicOptions() {
     $this->drupalLogin($web_user);
 
     // Create an unlimited cardinality field.
-    $this->field_name = Unicode::strtolower($this->randomMachineName());
+    $this->fieldName = Unicode::strtolower($this->randomMachineName());
     entity_create('field_storage_config', array(
-      'field_name' => $this->field_name,
+      'field_name' => $this->fieldName,
       'entity_type' => 'node',
       'type' => 'text',
       'cardinality' => -1,
@@ -41,13 +41,13 @@ function testMultiStepNodeFormBasicOptions() {
 
     // Attach an instance of the field to the page content type.
     entity_create('field_config', array(
-      'field_name' => $this->field_name,
+      'field_name' => $this->fieldName,
       'entity_type' => 'node',
       'bundle' => 'page',
       'label' => $this->randomMachineName() . '_label',
     ))->save();
     entity_get_form_display('node', 'page', 'default')
-      ->setComponent($this->field_name, array(
+      ->setComponent($this->fieldName, array(
         'type' => 'text_textfield',
       ))
       ->save();
@@ -56,7 +56,7 @@ function testMultiStepNodeFormBasicOptions() {
       'title[0][value]' => 'a',
       'promote[value]' => FALSE,
       'sticky[value]' => 1,
-      "{$this->field_name}[0][value]" => $this->randomString(32),
+      "{$this->fieldName}[0][value]" => $this->randomString(32),
     );
     $this->drupalPostForm('node/add/page', $edit, t('Add another item'));
     $this->assertNoFieldChecked('edit-promote-value', 'Promote stayed unchecked');
diff --git a/core/modules/node/src/Tests/NodeAccessBaseTableTest.php b/core/modules/node/src/Tests/NodeAccessBaseTableTest.php
index d5e4dd4..342ee77 100644
--- a/core/modules/node/src/Tests/NodeAccessBaseTableTest.php
+++ b/core/modules/node/src/Tests/NodeAccessBaseTableTest.php
@@ -30,6 +30,22 @@ class NodeAccessBaseTableTest extends NodeTestBase {
    */
   protected $profile = 'standard';
 
+  /**
+   * An array (keyed by uid and nid) to track which nodes are 'private'.
+   *
+   * For each user ID/node ID, $nodes[$uid][$nid] = $is_private.
+   *
+   * @var array
+   */
+  protected $nodesByUser = array();
+
+  /**
+   * An array of nids that are found to be visible while testing.
+   *
+   * @var array
+   */
+  protected $nidsVisible = array();
+
   protected function setUp() {
     parent::setUp();
 
@@ -57,8 +73,7 @@ function testNodeAccessBasic() {
     $num_simple_users = 2;
     $simple_users = array();
 
-    // nodes keyed by uid and nid: $nodes[$uid][$nid] = $is_private;
-    $this->nodesByUser = array();
+
     $titles = array(); // Titles keyed by nid
     $private_nodes = array(); // Array of nids marked private.
     for ($i = 0; $i < $num_simple_users; $i++) {
@@ -147,11 +162,11 @@ function testNodeAccessBasic() {
   protected function assertTaxonomyPage($is_admin) {
     foreach (array($this->publicTid, $this->privateTid) as $tid_is_private => $tid) {
       $this->drupalGet("taxonomy/term/$tid");
-      $this->nids_visible = array();
+      $this->nidsVisible = array();
       foreach ($this->xpath("//a[text()='Read more']") as $link) {
         // See also testTranslationRendering() in NodeTranslationUITest.
         $this->assertTrue(preg_match('|node/(\d+)$|', (string) $link['href'], $matches), 'Read more points to a node');
-        $this->nids_visible[$matches[1]] = TRUE;
+        $this->nidsVisible[$matches[1]] = TRUE;
       }
       foreach ($this->nodesByUser as $uid => $data) {
         foreach ($data as $nid => $is_private) {
@@ -163,10 +178,10 @@ protected function assertTaxonomyPage($is_admin) {
           if (!$is_admin && $tid_is_private) {
             $should_be_visible = $should_be_visible && $uid == $this->webUser->id();
           }
-          $this->assertIdentical(isset($this->nids_visible[$nid]), $should_be_visible, strtr('A %private node by user %uid is %visible for user %current_uid on the %tid_is_private page.', array(
+          $this->assertIdentical(isset($this->nidsVisible[$nid]), $should_be_visible, strtr('A %private node by user %uid is %visible for user %current_uid on the %tid_is_private page.', array(
             '%private' => $is_private ? 'private' : 'public',
             '%uid' => $uid,
-            '%visible' => isset($this->nids_visible[$nid]) ? 'visible' : 'not visible',
+            '%visible' => isset($this->nidsVisible[$nid]) ? 'visible' : 'not visible',
             '%current_uid' => $this->webUser->id(),
             '%tid_is_private' => $tid_is_private ? 'private' : 'public',
           )));
diff --git a/core/modules/node/src/Tests/NodeAdminTest.php b/core/modules/node/src/Tests/NodeAdminTest.php
index 616538c..52542c0 100644
--- a/core/modules/node/src/Tests/NodeAdminTest.php
+++ b/core/modules/node/src/Tests/NodeAdminTest.php
@@ -21,6 +21,33 @@ class NodeAdminTest extends NodeTestBase {
   protected $adminUser;
 
   /**
+   * A regular user with the 'access content overview' permission.
+   *
+   * @var \Drupal\user\UserInterface
+   */
+  protected $baseUser1;
+
+  /**
+   * A regular user with permission to view their own unpublished content.
+   *
+   * This user has both 'access content overview' and 'view own unpublished
+   * content' permissions.
+   *
+   * @var \Drupal\user\UserInterface
+   */
+  protected $baseUser2;
+
+  /**
+   * A regular user with permission to bypass node access rules.
+   *
+   * This user has both 'access content overview' and 'bypass node access'
+   * permissions.
+   *
+   * @var \Drupal\user\UserInterface
+   */
+  protected $baseUser3;
+
+  /**
    * Modules to enable.
    *
    * @var array
@@ -36,9 +63,9 @@ protected function setUp() {
     user_role_revoke_permissions(DRUPAL_AUTHENTICATED_RID, array('view own unpublished content'));
 
     $this->adminUser = $this->drupalCreateUser(array('access administration pages', 'access content overview', 'administer nodes', 'bypass node access'));
-    $this->base_user_1 = $this->drupalCreateUser(array('access content overview'));
-    $this->base_user_2 = $this->drupalCreateUser(array('access content overview', 'view own unpublished content'));
-    $this->base_user_3 = $this->drupalCreateUser(array('access content overview', 'bypass node access'));
+    $this->baseUser1 = $this->drupalCreateUser(array('access content overview'));
+    $this->baseUser2 = $this->drupalCreateUser(array('access content overview', 'view own unpublished content'));
+    $this->baseUser3 = $this->drupalCreateUser(array('access content overview', 'bypass node access'));
   }
 
   /**
@@ -97,8 +124,8 @@ function testContentAdminPages() {
 
     $nodes['published_page'] = $this->drupalCreateNode(array('type' => 'page'));
     $nodes['published_article'] = $this->drupalCreateNode(array('type' => 'article'));
-    $nodes['unpublished_page_1'] = $this->drupalCreateNode(array('type' => 'page', 'uid' => $this->base_user_1->id(), 'status' => 0));
-    $nodes['unpublished_page_2'] = $this->drupalCreateNode(array('type' => 'page', 'uid' => $this->base_user_2->id(), 'status' => 0));
+    $nodes['unpublished_page_1'] = $this->drupalCreateNode(array('type' => 'page', 'uid' => $this->baseUser1->id(), 'status' => 0));
+    $nodes['unpublished_page_2'] = $this->drupalCreateNode(array('type' => 'page', 'uid' => $this->baseUser2->id(), 'status' => 0));
 
     // Verify view, edit, and delete links for any content.
     $this->drupalGet('admin/content');
@@ -124,7 +151,7 @@ function testContentAdminPages() {
 
     // Verify no operation links are displayed for regular users.
     $this->drupalLogout();
-    $this->drupalLogin($this->base_user_1);
+    $this->drupalLogin($this->baseUser1);
     $this->drupalGet('admin/content');
     $this->assertResponse(200);
     $this->assertLinkByHref('node/' . $nodes['published_page']->id());
@@ -144,7 +171,7 @@ function testContentAdminPages() {
 
     // Verify unpublished content is displayed with permission.
     $this->drupalLogout();
-    $this->drupalLogin($this->base_user_2);
+    $this->drupalLogin($this->baseUser2);
     $this->drupalGet('admin/content');
     $this->assertResponse(200);
     $this->assertLinkByHref('node/' . $nodes['unpublished_page_2']->id());
@@ -162,7 +189,7 @@ function testContentAdminPages() {
 
     // Verify node access can be bypassed.
     $this->drupalLogout();
-    $this->drupalLogin($this->base_user_3);
+    $this->drupalLogin($this->baseUser3);
     $this->drupalGet('admin/content');
     $this->assertResponse(200);
     foreach ($nodes as $node) {
diff --git a/core/modules/node/src/Tests/NodeQueryAlterTest.php b/core/modules/node/src/Tests/NodeQueryAlterTest.php
index a26dcd0..ea0ce7b 100644
--- a/core/modules/node/src/Tests/NodeQueryAlterTest.php
+++ b/core/modules/node/src/Tests/NodeQueryAlterTest.php
@@ -23,14 +23,25 @@ class NodeQueryAlterTest extends NodeTestBase {
 
   /**
    * User with permission to view content.
+   *
+   * @var \Drupal\user\UserInterface
    */
   protected $accessUser;
 
   /**
-   * User without permission to view content.
+   * A first user without permission to view content.
+   *
+   * @var \Drupal\user\UserInterface
    */
   protected $noAccessUser;
 
+  /**
+   * A second user without permission to view content.
+   *
+   * @var \Drupal\user\UserInterface
+   */
+  protected $noAccessUser2;
+
   protected function setUp() {
     parent::setUp();
 
diff --git a/core/modules/node/src/Tests/NodeRevisionPermissionsTest.php b/core/modules/node/src/Tests/NodeRevisionPermissionsTest.php
index cd65dba..b3b3ecd 100644
--- a/core/modules/node/src/Tests/NodeRevisionPermissionsTest.php
+++ b/core/modules/node/src/Tests/NodeRevisionPermissionsTest.php
@@ -13,7 +13,21 @@
  * @group node
  */
 class NodeRevisionPermissionsTest extends NodeTestBase {
-  protected $node_revisions = array();
+  /**
+   * An array containing multiple revisions of multiple types of nodes.
+   *
+   * Each element of this array (whose key specifies a type of node) points
+   * to an array containing one node and four revisions of the same node.
+   *
+   * @var array
+   */
+  protected $nodeRevisions = array();
+
+  /**
+   * An array containing user accounts for testing purposes.
+   *
+   * @var array (of \Drupal\user\Entity\UserInterface)
+   */
   protected $accounts = array();
 
   // Map revision permission names to node revision access ops.
@@ -24,7 +38,7 @@ class NodeRevisionPermissionsTest extends NodeTestBase {
   );
 
   // Map revision permission names to node type revision access ops.
-  protected $type_map = array(
+  protected $typeMap = array(
     'view' => 'view page revisions',
     'update' => 'revert page revisions',
     'delete' => 'delete page revisions',
@@ -38,7 +52,7 @@ protected function setUp() {
     foreach ($types as $type) {
       // Create a node with several revisions.
       $nodes[$type] = $this->drupalCreateNode(array('type' => $type));
-      $this->node_revisions[$type][] = $nodes[$type];
+      $this->nodeRevisions[$type][] = $nodes[$type];
 
       for ($i = 0; $i < 3; $i++) {
         // Create a revision for the same nid and settings with a random log.
@@ -46,7 +60,7 @@ protected function setUp() {
         $revision->setNewRevision();
         $revision->revision_log = $this->randomMachineName(32);
         $revision->save();
-        $this->node_revisions[$type][] = $revision;
+        $this->nodeRevisions[$type][] = $revision;
       }
     }
   }
@@ -81,7 +95,7 @@ function testNodeRevisionAccessAnyType() {
     $normal_account->op = FALSE;
     $this->accounts[] = $normal_account;
     $accounts[] = $normal_account;
-    $revision = $this->node_revisions['page'][1];
+    $revision = $this->nodeRevisions['page'][1];
 
     $parameters = array(
       'op' => array_keys($this->map),
@@ -114,7 +128,7 @@ function testNodeRevisionAccessAnyType() {
    */
   function testNodeRevisionAccessPerType() {
     // Create three users, one with each revision permission.
-    foreach ($this->type_map as $op => $permission) {
+    foreach ($this->typeMap as $op => $permission) {
       // Create the user.
       $account = $this->drupalCreateUser(
         array(
@@ -129,32 +143,32 @@ function testNodeRevisionAccessPerType() {
     }
 
     $parameters = array(
-      'op' => array_keys($this->type_map),
+      'op' => array_keys($this->typeMap),
       'account' => $accounts,
     );
 
     // Test that the accounts have access to the correspoding page revision permissions.
-    $revision = $this->node_revisions['page'][1];
+    $revision = $this->nodeRevisions['page'][1];
 
     $permutations = $this->generatePermutations($parameters);
     $node_revision_access = \Drupal::service('access_check.node.revision');
     foreach ($permutations as $case) {
       // Skip this test if there are no revisions for the node.
       if (!($revision->isDefaultRevision() && (db_query('SELECT COUNT(vid) FROM {node_field_revision} WHERE nid = :nid', array(':nid' => $revision->id()))->fetchField() == 1 || $case['op'] == 'update' || $case['op'] == 'delete'))) {
-        if (!empty($case['account']->is_admin) || $case['account']->hasPermission($this->type_map[$case['op']], $case['account'])) {
-          $this->assertTrue($node_revision_access->checkAccess($revision, $case['account'], $case['op']), "{$this->type_map[$case['op']]} granted.");
+        if (!empty($case['account']->is_admin) || $case['account']->hasPermission($this->typeMap[$case['op']], $case['account'])) {
+          $this->assertTrue($node_revision_access->checkAccess($revision, $case['account'], $case['op']), "{$this->typeMap[$case['op']]} granted.");
         }
         else {
-          $this->assertFalse($node_revision_access->checkAccess($revision, $case['account'], $case['op']), "{$this->type_map[$case['op']]} not granted.");
+          $this->assertFalse($node_revision_access->checkAccess($revision, $case['account'], $case['op']), "{$this->typeMap[$case['op']]} not granted.");
         }
       }
     }
 
     // Test that the accounts have no access to the article revisions.
-    $revision = $this->node_revisions['article'][1];
+    $revision = $this->nodeRevisions['article'][1];
 
     foreach ($permutations as $case) {
-      $this->assertFalse($node_revision_access->checkAccess($revision, $case['account'], $case['op']), "{$this->type_map[$case['op']]} did not grant revision permission for articles.");
+      $this->assertFalse($node_revision_access->checkAccess($revision, $case['account'], $case['op']), "{$this->typeMap[$case['op']]} did not grant revision permission for articles.");
     }
   }
 }
diff --git a/core/modules/node/src/Tests/PageEditTest.php b/core/modules/node/src/Tests/PageEditTest.php
index b2d818b..41aad7b 100644
--- a/core/modules/node/src/Tests/PageEditTest.php
+++ b/core/modules/node/src/Tests/PageEditTest.php
@@ -13,7 +13,18 @@
  * @group node
  */
 class PageEditTest extends NodeTestBase {
+  /**
+   * A user with 'edit own page content' and 'create page content' permissions.
+   *
+   * @var \Drupal\user\UserInterface
+   */
   protected $webUser;
+
+  /**
+   * A user with permission to bypass node access and administer nodes.
+   *
+   * @var \Drupal\user\UserInterface
+   */
   protected $adminUser;
 
   protected function setUp() {
diff --git a/core/modules/node/src/Tests/PagePreviewTest.php b/core/modules/node/src/Tests/PagePreviewTest.php
index 5fc64d3..c02a8ec 100644
--- a/core/modules/node/src/Tests/PagePreviewTest.php
+++ b/core/modules/node/src/Tests/PagePreviewTest.php
@@ -30,7 +30,7 @@ class PagePreviewTest extends NodeTestBase {
    *
    * @var string
    */
-  protected $field_name;
+  protected $fieldName;
 
   protected function setUp() {
     parent::setUp();
@@ -62,9 +62,9 @@ protected function setUp() {
     $this->term = $term;
 
     // Create a field.
-    $this->field_name = Unicode::strtolower($this->randomMachineName());
+    $this->fieldName = Unicode::strtolower($this->randomMachineName());
     entity_create('field_storage_config', array(
-      'field_name' => $this->field_name,
+      'field_name' => $this->fieldName,
       'entity_type' => 'node',
       'type' => 'taxonomy_term_reference',
       'settings' => array(
@@ -78,25 +78,25 @@ protected function setUp() {
       'cardinality' => '-1',
     ))->save();
     entity_create('field_config', array(
-      'field_name' => $this->field_name,
+      'field_name' => $this->fieldName,
       'entity_type' => 'node',
       'bundle' => 'page',
     ))->save();
 
     entity_get_form_display('node', 'page', 'default')
-      ->setComponent($this->field_name, array(
+      ->setComponent($this->fieldName, array(
         'type' => 'taxonomy_autocomplete',
       ))
       ->save();
 
     // Show on default display and teaser.
     entity_get_display('node', 'page', 'default')
-      ->setComponent($this->field_name, array(
+      ->setComponent($this->fieldName, array(
         'type' => 'taxonomy_term_reference_link',
       ))
       ->save();
     entity_get_display('node', 'page', 'teaser')
-      ->setComponent($this->field_name, array(
+      ->setComponent($this->fieldName, array(
         'type' => 'taxonomy_term_reference_link',
       ))
       ->save();
@@ -108,7 +108,7 @@ protected function setUp() {
   function testPagePreview() {
     $title_key = 'title[0][value]';
     $body_key = 'body[0][value]';
-    $term_key = $this->field_name;
+    $term_key = $this->fieldName;
 
     // Fill in node creation form and preview node.
     $edit = array();
@@ -202,7 +202,7 @@ function testPagePreview() {
   function testPagePreviewWithRevisions() {
     $title_key = 'title[0][value]';
     $body_key = 'body[0][value]';
-    $term_key = $this->field_name;
+    $term_key = $this->fieldName;
     // Force revision on "Basic page" content.
     $node_type = NodeType::load('page');
     $node_type->setNewRevision(TRUE);
diff --git a/core/modules/node/src/Tests/Views/NodeFieldFilterTest.php b/core/modules/node/src/Tests/Views/NodeFieldFilterTest.php
index 599b126..2fa9bec 100644
--- a/core/modules/node/src/Tests/Views/NodeFieldFilterTest.php
+++ b/core/modules/node/src/Tests/Views/NodeFieldFilterTest.php
@@ -34,7 +34,7 @@ class NodeFieldFilterTest extends NodeTestBase {
    *
    * @var array
    */
-  public $node_titles = array();
+  public $nodeTitles = array();
 
   function setUp() {
     parent::setUp();
@@ -55,17 +55,17 @@ function setUp() {
     $field_storage->save();
 
     // Set up node titles.
-    $this->node_titles = array(
+    $this->nodeTitles = array(
       'en' => 'Food in Paris',
       'es' => 'Comida en Paris',
       'fr' => 'Nouriture en Paris',
     );
 
     // Create node with translations.
-    $node = $this->drupalCreateNode(array('title' => $this->node_titles['en'], 'langcode' => 'en', 'type' => 'page', 'body' => array(array('value' => $this->node_titles['en']))));
+    $node = $this->drupalCreateNode(array('title' => $this->nodeTitles['en'], 'langcode' => 'en', 'type' => 'page', 'body' => array(array('value' => $this->nodeTitles['en']))));
     foreach (array('es', 'fr') as $langcode) {
-      $translation = $node->addTranslation($langcode, array('title' => $this->node_titles[$langcode]));
-      $translation->body->value = $this->node_titles[$langcode];
+      $translation = $node->addTranslation($langcode, array('title' => $this->nodeTitles[$langcode]));
+      $translation->body->value = $this->nodeTitles[$langcode];
     }
     $node->save();
   }
@@ -114,7 +114,7 @@ protected function assertPageCounts($path, $counts, $message) {
     // page, and they are the same. So the title/body string should appear on
     // the page twice as many times as the input count.
     foreach ($counts as $langcode => $count) {
-      $this->assertEqual(substr_count($text, $this->node_titles[$langcode]), 2 * $count, 'Translation ' . $langcode . ' has count ' . $count . ' with ' . $message);
+      $this->assertEqual(substr_count($text, $this->nodeTitles[$langcode]), 2 * $count, 'Translation ' . $langcode . ' has count ' . $count . ' with ' . $message);
     }
   }
 }
diff --git a/core/modules/node/src/Tests/Views/NodeLanguageTest.php b/core/modules/node/src/Tests/Views/NodeLanguageTest.php
index b4d9891..ac35bb9 100644
--- a/core/modules/node/src/Tests/Views/NodeLanguageTest.php
+++ b/core/modules/node/src/Tests/Views/NodeLanguageTest.php
@@ -35,7 +35,7 @@ class NodeLanguageTest extends NodeTestBase {
    *
    * @var array
    */
-  public $node_titles = array();
+  public $nodeTitles = array();
 
   /**
    * {@inheritdoc}
@@ -61,7 +61,7 @@ protected function setUp() {
     // Set up node titles. They should not include the words "French",
     // "English", or "Spanish", as there is a language field in the view
     // that prints out those words.
-    $this->node_titles = array(
+    $this->nodeTitles = array(
       'es' => array(
         'Primero nodo es',
         'Segundo nodo es',
@@ -77,11 +77,11 @@ protected function setUp() {
     );
 
     // Create nodes with translations.
-    foreach ($this->node_titles['es'] as $index => $title) {
+    foreach ($this->nodeTitles['es'] as $index => $title) {
       $node = $this->drupalCreateNode(array('title' => $title, 'langcode' => 'es', 'type' => 'page', 'promote' => 1));
       foreach (array('en', 'fr') as $langcode) {
-        if (isset($this->node_titles[$langcode][$index])) {
-          $translation = $node->addTranslation($langcode, array('title' => $this->node_titles[$langcode][$index]));
+        if (isset($this->nodeTitles[$langcode][$index])) {
+          $translation = $node->addTranslation($langcode, array('title' => $this->nodeTitles[$langcode][$index]));
           $translation->body->value = $this->randomMachineName(32);
         }
       }
@@ -102,7 +102,7 @@ public function testLanguages() {
     $message = 'French/Spanish page';
 
     // Test that the correct nodes are shown.
-    foreach ($this->node_titles as $langcode => $list) {
+    foreach ($this->nodeTitles as $langcode => $list) {
       foreach ($list as $title) {
         if ($langcode == 'en') {
           $this->assertNoText($title, $title . ' does not appear on ' . $message);
@@ -123,10 +123,10 @@ public function testLanguages() {
     $page = $this->getTextContent();
     $pos_es_max = 0;
     $pos_fr_min = 10000;
-    foreach ($this->node_titles['es'] as $title) {
+    foreach ($this->nodeTitles['es'] as $title) {
       $pos_es_max = max($pos_es_max, strpos($page, $title));
     }
-    foreach ($this->node_titles['fr'] as $title) {
+    foreach ($this->nodeTitles['fr'] as $title) {
       $pos_fr_min = min($pos_fr_min, strpos($page, $title));
     }
     $this->assertTrue($pos_es_max < $pos_fr_min, 'Spanish translations appear before French on ' . $message);
@@ -141,12 +141,12 @@ public function testLanguages() {
 
     // Test the front page view filter. Only node titles in the current language
     // should be displayed on the front page by default.
-    foreach ($this->node_titles as $langcode => $titles) {
+    foreach ($this->nodeTitles as $langcode => $titles) {
       $this->drupalGet(($langcode == 'en' ? '' : "$langcode/") . 'node');
       foreach ($titles as $title) {
         $this->assertText($title);
       }
-      foreach ($this->node_titles as $control_langcode => $control_titles) {
+      foreach ($this->nodeTitles as $control_langcode => $control_titles) {
         if ($langcode != $control_langcode) {
           foreach ($control_titles as $title) {
             $this->assertNoText($title);
@@ -157,18 +157,18 @@ public function testLanguages() {
 
     // Test the node admin view filter. By default all translations should show.
     $this->drupalGet('admin/content');
-    foreach ($this->node_titles as $titles) {
+    foreach ($this->nodeTitles as $titles) {
       foreach ($titles as $title) {
         $this->assertText($title);
       }
     }
     // When filtered, only the specific languages should show.
-    foreach ($this->node_titles as $langcode => $titles) {
+    foreach ($this->nodeTitles as $langcode => $titles) {
       $this->drupalGet('admin/content', array('query' => array('langcode' => $langcode)));
       foreach ($titles as $title) {
         $this->assertText($title);
       }
-      foreach ($this->node_titles as $control_langcode => $control_titles) {
+      foreach ($this->nodeTitles as $control_langcode => $control_titles) {
         if ($langcode != $control_langcode) {
           foreach ($control_titles as $title) {
             $this->assertNoText($title);
@@ -183,9 +183,9 @@ public function testLanguages() {
     $config = \Drupal::config('views.view.frontpage');
     $config->set('display.default.display_options.filters.langcode.value', array(PluginBase::VIEWS_QUERY_LANGUAGE_SITE_DEFAULT => PluginBase::VIEWS_QUERY_LANGUAGE_SITE_DEFAULT));
     $config->save();
-    foreach ($this->node_titles as $langcode => $titles) {
+    foreach ($this->nodeTitles as $langcode => $titles) {
       $this->drupalGet(($langcode == 'en' ? '' : "$langcode/") . 'node');
-      foreach ($this->node_titles as $control_langcode => $control_titles) {
+      foreach ($this->nodeTitles as $control_langcode => $control_titles) {
         foreach ($control_titles as $title) {
           if ($control_langcode == 'en') {
             $this->assertText($title, 'English title is shown when filtering is site default');
@@ -213,7 +213,7 @@ public function testLanguages() {
 
     // With a fixed language selected, there is no language-based URL.
     $this->drupalGet('node');
-    foreach ($this->node_titles as $control_langcode => $control_titles) {
+    foreach ($this->nodeTitles as $control_langcode => $control_titles) {
       foreach ($control_titles as $title) {
         if ($control_langcode == 'es') {
           $this->assertText($title, 'Spanish title is shown when filtering is fixed UI language');