diff --git a/core/modules/search/src/Tests/SearchCommentCountToggleTest.php b/core/modules/search/src/Tests/SearchCommentCountToggleTest.php
index ad66a90..5ddfac4 100644
--- a/core/modules/search/src/Tests/SearchCommentCountToggleTest.php
+++ b/core/modules/search/src/Tests/SearchCommentCountToggleTest.php
@@ -33,7 +33,7 @@ class SearchCommentCountToggleTest extends SearchTestBase {
   /**
    * A user with permission to search and post comments.
    *
-   * @var object
+   * @var \Drupal\user\UserInterface
    */
   protected $searchingUser;
 
diff --git a/core/modules/search/src/Tests/SearchCommentTest.php b/core/modules/search/src/Tests/SearchCommentTest.php
index ee68fda..682a659 100644
--- a/core/modules/search/src/Tests/SearchCommentTest.php
+++ b/core/modules/search/src/Tests/SearchCommentTest.php
@@ -25,8 +25,34 @@ class SearchCommentTest extends SearchTestBase {
    */
   public static $modules = array('filter', 'node', 'comment');
 
+  /**
+   * Test subject for comments.
+   *
+   * @var string
+   */
+  protected $commentSubject;
+
+  /**
+   * Id for the administrator role.
+   *
+   * @var string
+   */
+  protected $adminRole;
+
+  /**
+   * A user with various administrative permissions.
+   *
+   * @var \Drupal\user\UserInterface
+   */
   protected $adminUser;
 
+  /**
+   * Test node for searching.
+   *
+   * @var \Drupal\node\NodeInterface
+   */
+  protected $node;
+
   protected function setUp() {
     parent::setUp();
 
diff --git a/core/modules/search/src/Tests/SearchKeywordsConditionsTest.php b/core/modules/search/src/Tests/SearchKeywordsConditionsTest.php
index d4dd242..c5e42f1 100644
--- a/core/modules/search/src/Tests/SearchKeywordsConditionsTest.php
+++ b/core/modules/search/src/Tests/SearchKeywordsConditionsTest.php
@@ -25,6 +25,13 @@ class SearchKeywordsConditionsTest extends SearchTestBase {
    */
   public static $modules = array('comment', 'search_extra_type');
 
+  /**
+   * A user with permission to search and post comments.
+   *
+   * @var \Drupal\user\UserInterface
+   */
+  protected $searchingUser;
+
   protected function setUp() {
     parent::setUp();
 
diff --git a/core/modules/search/src/Tests/SearchLanguageTest.php b/core/modules/search/src/Tests/SearchLanguageTest.php
index 266e522..6a146a1 100644
--- a/core/modules/search/src/Tests/SearchLanguageTest.php
+++ b/core/modules/search/src/Tests/SearchLanguageTest.php
@@ -24,6 +24,13 @@ class SearchLanguageTest extends SearchTestBase {
    */
   public static $modules = array('language');
 
+  /**
+   * Array of nodes available to search.
+   *
+   * @var array
+   */
+  protected $searchableNodes;
+
   protected function setUp() {
     parent::setUp();
 
diff --git a/core/modules/search/src/Tests/SearchPreprocessLangcodeTest.php b/core/modules/search/src/Tests/SearchPreprocessLangcodeTest.php
index 0093e6a..fbac74d 100644
--- a/core/modules/search/src/Tests/SearchPreprocessLangcodeTest.php
+++ b/core/modules/search/src/Tests/SearchPreprocessLangcodeTest.php
@@ -20,6 +20,13 @@ class SearchPreprocessLangcodeTest extends SearchTestBase {
    */
   public static $modules = array('search_langcode_test');
 
+  /**
+   * Test node for searching.
+   *
+   * @var \Drupal\node\NodeInterface
+   */
+  protected $node;
+
   protected function setUp() {
     parent::setUp();