diff --git a/core/modules/system/lib/Drupal/system/Tests/Ajax/AjaxTestBase.php b/core/modules/system/lib/Drupal/system/Tests/Ajax/AjaxTestBase.php
index dd3ef467f058828d88c6e8ffaaeca47f56d4f636..a196f856053d6344b4cbe7ec87e8cd2100aa6292 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Ajax/AjaxTestBase.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Ajax/AjaxTestBase.php
@@ -10,7 +10,7 @@
 use Drupal\simpletest\WebTestBase;
 
 /**
- * Base test system for AJAX tests.
+ * Provides a base class for Ajax tests.
  */
 abstract class AjaxTestBase extends WebTestBase {
 
diff --git a/core/modules/system/lib/Drupal/system/Tests/Ajax/FormValuesTest.php b/core/modules/system/lib/Drupal/system/Tests/Ajax/FormValuesTest.php
index 0ea8abf0b6e59d41ec239bc7a5780c0eb4eaa2b9..9abc495e0a3679b506bf8c566efbe9d3e1aacb66 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Ajax/FormValuesTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Ajax/FormValuesTest.php
@@ -27,7 +27,7 @@ function setUp() {
   }
 
   /**
-   * Submits forms with select and checkbox elements via AJAX.
+   * Submits forms with select and checkbox elements via Ajax.
    */
   function testSimpleAjaxFormValue() {
     // Verify form values of a select element.
diff --git a/core/modules/system/lib/Drupal/system/Tests/Ajax/FrameworkTest.php b/core/modules/system/lib/Drupal/system/Tests/Ajax/FrameworkTest.php
index 204701f1222b0ed394e36015eb394fdfea0cde92..00e7f14f89df2564ea3d90a2015fa35fb6cedd1e 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Ajax/FrameworkTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Ajax/FrameworkTest.php
@@ -69,7 +69,7 @@ function testAJAXRenderError() {
   }
 
   /**
-   * Tests that new JavaScript and CSS files are returned on an AJAX request.
+   * Tests that new JavaScript and CSS files are returned on an Ajax request.
    */
   function testLazyLoad() {
     $expected = array(
@@ -103,7 +103,7 @@ function testLazyLoad() {
     $this->assertTrue(!isset($original_settings[$expected['css']]), format_string('Page originally lacks the %css file, as expected.', array('%css' => $expected['css'])));
     $this->assertTrue(!isset($original_settings[$expected['js']]), format_string('Page originally lacks the %js file, as expected.', array('%js' => $expected['js'])));
 
-    // Submit the AJAX request without triggering files getting added.
+    // Submit the Ajax request without triggering files getting added.
     $commands = $this->drupalPostAJAX(NULL, array('add_files' => FALSE), array('op' => t('Submit')));
     $new_settings = $this->drupalGetSettings();
 
@@ -124,7 +124,7 @@ function testLazyLoad() {
     $this->assertFalse($found_settings_command, format_string('Page state still lacks the %css and %js files, as expected.', array('%css' => $expected['css'], '%js' => $expected['js'])));
     $this->assertFalse($found_markup_command, format_string('Page still lacks the %css and %js files, as expected.', array('%css' => $expected['css'], '%js' => $expected['js'])));
 
-    // Submit the AJAX request and trigger adding files.
+    // Submit the Ajax request and trigger adding files.
     $commands = $this->drupalPostAJAX(NULL, array('add_files' => TRUE), array('op' => t('Submit')));
     $new_settings = $this->drupalGetSettings();
     $new_css = $new_settings['ajaxPageState']['css'];
@@ -134,12 +134,12 @@ function testLazyLoad() {
     $this->assertIdentical($new_settings[$expected['setting_name']], $expected['setting_value'], format_string('Page now has the %setting.', array('%setting' => $expected['setting_name'])));
 
     // Verify the expected CSS file was added, both to Drupal.settings, and as
-    // an AJAX command for inclusion into the HTML.
+    // an Ajax command for inclusion into the HTML.
     $this->assertEqual($new_css, $original_css + array($expected['css'] => 1), format_string('Page state now has the %css file.', array('%css' => $expected['css'])));
     $this->assertCommand($commands, array('data' => $expected_css_html), format_string('Page now has the %css file.', array('%css' => $expected['css'])));
 
     // Verify the expected JS file was added, both to Drupal.settings, and as
-    // an AJAX command for inclusion into the HTML. By testing for an exact HTML
+    // an Ajax command for inclusion into the HTML. By testing for an exact HTML
     // string containing the SCRIPT tag, we also ensure that unexpected
     // JavaScript code, such as a jQuery.extend() that would potentially clobber
     // rather than properly merge settings, didn't accidentally get added.
diff --git a/core/modules/system/lib/Drupal/system/Tests/Ajax/MultiFormTest.php b/core/modules/system/lib/Drupal/system/Tests/Ajax/MultiFormTest.php
index cf3adaac1c5e85fb75133fb7a2e04f77495d16d9..aab0858acb29aabd2d4367a3652d7c2655400312 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Ajax/MultiFormTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Ajax/MultiFormTest.php
@@ -8,7 +8,7 @@
 namespace Drupal\system\Tests\Ajax;
 
 /**
- * Tests that Ajax-enabled forms work when multiple instances of the same form are on a page.
+ * Tests Ajax-enabled forms functionality with multiple instances of the form.
  */
 class MultiFormTest extends AjaxTestBase {
 
@@ -53,7 +53,7 @@ function setUp() {
   }
 
   /**
-   * Tests that pages with the 'page_node_form' included twice works correctly.
+   * Tests that pages with the 'page_node_form' included twice work correctly.
    */
   function testMultiForm() {
     // HTML IDs for elements within the field are potentially modified with
diff --git a/core/modules/system/lib/Drupal/system/Tests/Batch/PageTest.php b/core/modules/system/lib/Drupal/system/Tests/Batch/PageTest.php
index 69dee9c4e36673b90ede94e0fe45faa5f3a32f35..db1d6711eb7087412c8fa45f12fd67749d4a568c 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Batch/PageTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Batch/PageTest.php
@@ -10,7 +10,7 @@
 use Drupal\simpletest\WebTestBase;
 
 /**
- * Tests for the Batch API Progress page.
+ * Tests the Batch API Progress page.
  */
 class PageTest extends WebTestBase {
 
diff --git a/core/modules/system/lib/Drupal/system/Tests/Batch/ProcessingTest.php b/core/modules/system/lib/Drupal/system/Tests/Batch/ProcessingTest.php
index 2f56ecd2b2d7b7f31ea66cc8038e7ce252e248e7..9bd0c61912b3c096c6fc134e54eb775f4ea9d5ac 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Batch/ProcessingTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Batch/ProcessingTest.php
@@ -10,7 +10,7 @@
 use Drupal\simpletest\WebTestBase;
 
 /**
- * Tests for the Batch API.
+ * Tests the Batch API.
  */
 class ProcessingTest extends WebTestBase {
 
@@ -166,6 +166,7 @@ function testBatchLargePercentage() {
    *   Array of raw strings to look for .
    * @param $message
    *   Message to display.
+   *
    * @return
    *   TRUE on pass, FALSE on fail.
    */
diff --git a/core/modules/system/lib/Drupal/system/Tests/Bundle/BundleTest.php b/core/modules/system/lib/Drupal/system/Tests/Bundle/BundleTest.php
index 9e662c969e7bab504eb569201b6bd0a4c9aad202..3fa0d1d94a3a23637c0b843b420c3e8c4eb68229 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Bundle/BundleTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Bundle/BundleTest.php
@@ -10,7 +10,7 @@
 use Drupal\simpletest\WebTestBase;
 
 /**
- * Test bundle registration to the DIC.
+ * Tests bundle registration to the DIC.
  */
 class BundleTest extends WebTestBase {
 
@@ -30,7 +30,7 @@ public static function getInfo() {
   }
 
   /**
-   * Test that services provided by module bundles get registered to the DIC.
+   * Tests that services provided by module bundles get registered to the DIC.
    */
   function testBundleRegistration() {
     $this->assertTrue(drupal_container()->getDefinition('file.usage')->getClass() == 'Drupal\\bundle_test\\TestFileUsage', 'Class has been changed');
diff --git a/core/modules/system/lib/Drupal/system/Tests/Cache/CacheTestBase.php b/core/modules/system/lib/Drupal/system/Tests/Cache/CacheTestBase.php
index 6f9c2699d785ab939bcdfb556c910834c3cc0be8..25ab106be615f729c570fee5dd694479a7c215e3 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Cache/CacheTestBase.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Cache/CacheTestBase.php
@@ -41,7 +41,7 @@ protected function checkCacheExists($cid, $var, $bin = NULL) {
   }
 
   /**
-   * Assert or a cache entry exists.
+   * Asserts that a cache entry exists.
    *
    * @param $message
    *   Message to display.
@@ -67,7 +67,7 @@ protected function assertCacheExists($message, $var = NULL, $cid = NULL, $bin =
   }
 
   /**
-   * Assert or a cache entry has been removed.
+   * Asserts that a cache entry has been removed.
    *
    * @param $message
    *   Message to display.
diff --git a/core/modules/system/lib/Drupal/system/Tests/Cache/DatabaseBackendUnitTest.php b/core/modules/system/lib/Drupal/system/Tests/Cache/DatabaseBackendUnitTest.php
index 585a3ff6ffa7742cb8c6aa646e25a09a0ae13127..f301257b0574084c57b46c635f93c4d0c1eef1f8 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Cache/DatabaseBackendUnitTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Cache/DatabaseBackendUnitTest.php
@@ -22,14 +22,26 @@ public static function getInfo() {
     );
   }
 
+  /**
+   * Creates a new instance of DatabaseBackend.
+   *
+   * @return
+   *   A new DatabaseBackend object.
+   */
   protected function createCacheBackend($bin) {
     return new DatabaseBackend($bin);
   }
 
+  /**
+   * Installs system schema.
+   */
   public function setUpCacheBackend() {
     drupal_install_schema('system');
   }
 
+  /**
+   * Uninstalls system schema.
+   */
   public function tearDownCacheBackend() {
     drupal_uninstall_schema('system');
   }
diff --git a/core/modules/system/lib/Drupal/system/Tests/Cache/GenericCacheBackendUnitTestBase.php b/core/modules/system/lib/Drupal/system/Tests/Cache/GenericCacheBackendUnitTestBase.php
index c54943f5626cbffca43aa20ae5e8cf941baf42a6..95805d7205eefe3dc3822f25eb8150f9ebb59139 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Cache/GenericCacheBackendUnitTestBase.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Cache/GenericCacheBackendUnitTestBase.php
@@ -13,8 +13,10 @@
 use stdClass;
 
 /**
+ * Tests any cache backend.
+ *
  * Full generic unit test suite for any cache backend. In order to use it for a
- * cache backend implementation extend this class and override the
+ * cache backend implementation, extend this class and override the
  * createBackendInstace() method to return an object.
  *
  * @see DatabaseBackendUnitTestCase
@@ -44,7 +46,7 @@ abstract class GenericCacheBackendUnitTestBase extends UnitTestBase {
   protected $defaultValue;
 
   /**
-   * Get testing bin.
+   * Gets the testing bin.
    *
    * Override this method if you want to work on a different bin than the
    * default one.
@@ -60,7 +62,7 @@ protected function getTestBin() {
   }
 
   /**
-   * Create a cache backend to test.
+   * Creates a cache backend to test.
    *
    * Override this method to test a CacheBackend.
    *
@@ -73,21 +75,22 @@ protected function getTestBin() {
   protected abstract function createCacheBackend($bin);
 
   /**
-   * Allow specific implementation to change the environement before test run.
+   * Allows specific implementation to change the environment before a test run.
    */
   public function setUpCacheBackend() {
   }
 
   /**
-   * Allow specific implementation to alter the environement after test run but
-   * before the real tear down, which will changes things such as the database
-   * prefix.
+   * Allows alteration of environment after a test run but before tear down.
+   *
+   * Used before the real tear down because the tear down will change things
+   * such as the database prefix.
    */
   public function tearDownCacheBackend() {
   }
 
   /**
-   * Get backend to test, this will get a shared instance set in the object.
+   * Gets a backend to test; this will get a shared instance set in the object.
    *
    * @return Drupal\Core\Cache\CacheBackendInterface
    *   Cache backend to test.
@@ -335,7 +338,7 @@ public function testDeleteMultiple() {
   }
 
   /**
-   * Test Drupal\Core\Cache\CacheBackendInterface::flush().
+   * Tests Drupal\Core\Cache\CacheBackendInterface::flush().
    */
   public function testFlush() {
     $backend = $this->getCacheBackend();
diff --git a/core/modules/system/lib/Drupal/system/Tests/Cache/MemoryBackendUnitTest.php b/core/modules/system/lib/Drupal/system/Tests/Cache/MemoryBackendUnitTest.php
index 499ddaf3a5edd298cd2f4b2ade25c2bcdf7723ea..d3a29e36fbd09f4ca3e1756e9553947739dc5bfc 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Cache/MemoryBackendUnitTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Cache/MemoryBackendUnitTest.php
@@ -22,6 +22,12 @@ public static function getInfo() {
     );
   }
 
+  /**
+   * Creates a new instance of MemoryBackend.
+   *
+   * @return
+   *   A new MemoryBackend object.
+   */
   protected function createCacheBackend($bin) {
     return new MemoryBackend($bin);
   }
diff --git a/core/modules/system/lib/Drupal/system/Tests/Common/AddFeedTest.php b/core/modules/system/lib/Drupal/system/Tests/Common/AddFeedTest.php
index 87e1731a625a7e2564e7646aabb4006cb5151bc4..e23525ed89e463ea40bd89ddc001d0f849e2540c 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Common/AddFeedTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Common/AddFeedTest.php
@@ -91,7 +91,9 @@ function urlToRSSLinkPattern($url, $title = '') {
   }
 
   /**
-   * Check that special characters are correctly escaped. Test for issue #1211668.
+   * Checks that special characters are correctly escaped.
+   *
+   * @see http://drupal.org/node/1211668
    */
   function testFeedIconEscaping() {
     $variables = array();
diff --git a/core/modules/system/lib/Drupal/system/Tests/Common/CascadingStylesheetsTest.php b/core/modules/system/lib/Drupal/system/Tests/Common/CascadingStylesheetsTest.php
index db0303c26f15fd79503a4ed98391cafac09449a6..9009bbb934c384cdcf0d707e573b708aac19981d 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Common/CascadingStylesheetsTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Common/CascadingStylesheetsTest.php
@@ -82,7 +82,7 @@ function testAddExternal() {
   }
 
   /**
-   * Makes sure that reseting the CSS empties the cache.
+   * Makes sure that resetting the CSS empties the cache.
    */
   function testReset() {
     drupal_static_reset('drupal_add_css');
diff --git a/core/modules/system/lib/Drupal/system/Tests/Common/FormatDateTest.php b/core/modules/system/lib/Drupal/system/Tests/Common/FormatDateTest.php
index 87d97b6b72261cff982f9d4dfb6ed3ac1f23e881..d3cd9e63209645606fab680b06f7a1e0904d82f5 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Common/FormatDateTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Common/FormatDateTest.php
@@ -74,7 +74,7 @@ function testAdminDefinedFormatDate() {
   }
 
   /**
-   * Tests for the format_date() function.
+   * Tests the format_date() function.
    */
   function testFormatDate() {
     global $user;
diff --git a/core/modules/system/lib/Drupal/system/Tests/Common/HtmlIdentifierUnitTest.php b/core/modules/system/lib/Drupal/system/Tests/Common/HtmlIdentifierUnitTest.php
index d0daf384450bf22df93292ba95352c3be85a9e47..df4046cd7144bbdcb17dd2fa4b890411284294ee 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Common/HtmlIdentifierUnitTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Common/HtmlIdentifierUnitTest.php
@@ -10,7 +10,7 @@
 use Drupal\simpletest\UnitTestBase;
 
 /**
- * Test for cleaning HTML identifiers.
+ * Tests cleaning HTML identifiers.
  */
 class HtmlIdentifierUnitTest extends UnitTestBase {
   public static function getInfo() {
diff --git a/core/modules/system/lib/Drupal/system/Tests/Common/SchemaTest.php b/core/modules/system/lib/Drupal/system/Tests/Common/SchemaTest.php
index c33d59ad875e0bc18a927401ca914f2a80732e3d..7c328b438bf5f7d8ae7749164931cabc25fbe822 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Common/SchemaTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Common/SchemaTest.php
@@ -13,9 +13,10 @@
 use Exception;
 
 /**
- * Unit tests for the Schema API.
+ * Tests the Schema API.
  */
 class SchemaTest extends WebTestBase {
+
   /**
    * A global counter for table and field creation.
    */
@@ -30,7 +31,7 @@ public static function getInfo() {
   }
 
   /**
-   *
+   * Tests database interactions.
    */
   function testSchema() {
     // Try creating a table.
@@ -144,6 +145,15 @@ function testSchema() {
     $this->assertTrue(db_table_exists('test_timestamp'), 'Table with database specific datatype was created.');
   }
 
+  /**
+   * Tests inserting data into an existing table.
+   *
+   * @param $table
+   *   The database table to insert data into.
+   *
+   * @return
+   *   TRUE if the insert succeeded, FALSE otherwise.
+   */
   function tryInsert($table = 'test_table') {
     try {
        db_insert($table)
@@ -209,11 +219,12 @@ function testUnsignedColumns() {
    * Tries to insert a negative value into columns defined as unsigned.
    *
    * @param $table_name
-   *   The table to insert
+   *   The table to insert.
    * @param $column_name
-   *   The column to insert
+   *   The column to insert.
+   *
    * @return
-   *   TRUE if the insert succeeded, FALSE otherwise
+   *   TRUE if the insert succeeded, FALSE otherwise.
    */
   function tryUnsignedInsert($table_name, $column_name) {
     try {
@@ -228,7 +239,7 @@ function tryUnsignedInsert($table_name, $column_name) {
   }
 
   /**
-   * Test adding columns to an existing table.
+   * Tests adding columns to an existing table.
    */
   function testSchemaAddField() {
     // Test varchar types.
@@ -300,7 +311,7 @@ function testSchemaAddField() {
   }
 
   /**
-   * Assert that a given field can be added and removed from a table.
+   * Asserts that a given field can be added and removed from a table.
    *
    * The addition test covers both defining a field of a given specification
    * when initially creating at table and extending an existing table.
@@ -357,7 +368,7 @@ protected function assertFieldAdditionRemoval($field_spec) {
   }
 
   /**
-   * Assert that a newly added field has the correct characteristics.
+   * Asserts that a newly added field has the correct characteristics.
    */
   protected function assertFieldCharacteristics($table_name, $field_name, $field_spec) {
     // Check that the initial value has been registered.
diff --git a/core/modules/system/lib/Drupal/system/Tests/Common/SimpleTestErrorCollectorTest.php b/core/modules/system/lib/Drupal/system/Tests/Common/SimpleTestErrorCollectorTest.php
index c8a08baea5849c7ed27b7bf18ab8d93d7f2ecde4..16c62fcb0ae3452be6232a140ccd2556cac50efd 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Common/SimpleTestErrorCollectorTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Common/SimpleTestErrorCollectorTest.php
@@ -61,7 +61,7 @@ function testErrorCollect() {
   }
 
   /**
-   * Error handler that collects errors in an array.
+   * Stores errors into an array.
    *
    * This test class is trying to verify that simpletest correctly sees errors
    * and warnings. However, it can't generate errors and warnings that
diff --git a/core/modules/system/lib/Drupal/system/Tests/Common/TableSortExtenderUnitTest.php b/core/modules/system/lib/Drupal/system/Tests/Common/TableSortExtenderUnitTest.php
index 9a39cfc9318186fef1e360ee01e6b10074368bff..c7cc2a9b8e60f35bfce2c5c34e86e14b941fcf31 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Common/TableSortExtenderUnitTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Common/TableSortExtenderUnitTest.php
@@ -10,7 +10,7 @@
 use Drupal\simpletest\UnitTestBase;
 
 /**
- * Test unicode handling features implemented in unicode.inc.
+ * Tests unicode handling features implemented in unicode.inc.
  */
 class TableSortExtenderUnitTest extends UnitTestBase {
 
@@ -44,7 +44,7 @@ function tearDown() {
   }
 
   /**
-   * Test tablesort_init().
+   * Tests tablesort_init().
    */
   function testTableSortInit() {
 
diff --git a/core/modules/system/lib/Drupal/system/Tests/Common/UrlTest.php b/core/modules/system/lib/Drupal/system/Tests/Common/UrlTest.php
index 473e352159105278c1a401a2a9b62fdce62a1bf7..39ed2b4d617be355eff3399316c2251902040deb 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Common/UrlTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Common/UrlTest.php
@@ -53,6 +53,17 @@ function testLCustomClass() {
     $this->assertTrue($this->hasClass($link, 'active'), format_string('Class @class is present on link to the current page', array('@class' => 'active')));
   }
 
+  /**
+   * Checks for class existence in link.
+   *
+   * @param $link
+   *   URL to search.
+   * @param $class
+   *   Element class to search for.
+   *
+   * @return bool
+   *   TRUE if the class is found, FALSE otherwise.
+   */
   private function hasClass($link, $class) {
     return preg_match('|class="([^\"\s]+\s+)*' . $class . '|', $link);
   }
diff --git a/core/modules/system/lib/Drupal/system/Tests/Database/DeleteTruncateTest.php b/core/modules/system/lib/Drupal/system/Tests/Database/DeleteTruncateTest.php
index e31ac2c1e8fe64c7d7d2e63fafa8b7a83a2701fc..3d72da19b6d84cf2aca41b3df85f53d1b1159ca7 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Database/DeleteTruncateTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Database/DeleteTruncateTest.php
@@ -8,7 +8,7 @@
 namespace Drupal\system\Tests\Database;
 
 /**
- * Delete/Truncate tests.
+ * Tests delete and truncate queries.
  *
  * The DELETE tests are not as extensive, as all of the interesting code for
  * DELETE queries is in the conditional which is identical to the UPDATE and
diff --git a/core/modules/system/lib/Drupal/system/Tests/Database/InsertLobTest.php b/core/modules/system/lib/Drupal/system/Tests/Database/InsertLobTest.php
index 36fd72b68f69c6e8de8e17bd70a82504290c552f..63ffd294645e7509d38d45501ba9d38f21a8858e 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Database/InsertLobTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Database/InsertLobTest.php
@@ -8,7 +8,7 @@
 namespace Drupal\system\Tests\Database;
 
 /**
- * Insert tests using LOB fields, which are weird on some databases.
+ * Tests inserts using LOB fields, which are weird on some databases.
  */
 class InsertLobTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/lib/Drupal/system/Tests/Database/InsertTest.php b/core/modules/system/lib/Drupal/system/Tests/Database/InsertTest.php
index ffaeee0fbb351c11f03273e3c525fc5f3cdeace3..76afcf81f576d2caa086d4ec65392756879a6b99 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Database/InsertTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Database/InsertTest.php
@@ -128,7 +128,7 @@ function testInsertFieldOnlyDefinintion() {
   }
 
   /**
-   * Test that inserts return the proper auto-increment ID.
+   * Tests that inserts return the proper auto-increment ID.
    */
   function testInsertLastInsertID() {
     $id = db_insert('test')
diff --git a/core/modules/system/lib/Drupal/system/Tests/Database/MergeTest.php b/core/modules/system/lib/Drupal/system/Tests/Database/MergeTest.php
index c9e56371587e0d27a5bb9d7bf85e3098c8c7d395..d5d690964a665f58ca05a6a2659f158dbaac5897 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Database/MergeTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Database/MergeTest.php
@@ -98,7 +98,7 @@ function testMergeUpdateExcept() {
   }
 
   /**
-   * Confirms that we can merge-update a record successfully, with alternate replacement.
+   * Confirms that we can merge-update a record, with alternate replacement.
    */
   function testMergeUpdateExplicit() {
     $num_records_before = db_query('SELECT COUNT(*) FROM {test_people}')->fetchField();
diff --git a/core/modules/system/lib/Drupal/system/Tests/Database/SelectComplexTest.php b/core/modules/system/lib/Drupal/system/Tests/Database/SelectComplexTest.php
index 6476f1e3785c86a9c243f39a08df65e014b2c69e..643b036689670593f6dc76b9d6071119c2cee923 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Database/SelectComplexTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Database/SelectComplexTest.php
@@ -204,6 +204,9 @@ function testCountQuery() {
     $this->assertEqual($record->$age_field, 27, 'Correct data retrieved.');
   }
 
+  /**
+   * Tests having queries.
+   */
   function testHavingCountQuery() {
     $query = db_select('test')
       ->extend('Drupal\Core\Database\Query\PagerSelectExtender')
diff --git a/core/modules/system/lib/Drupal/system/Tests/Database/SelectSubqueryTest.php b/core/modules/system/lib/Drupal/system/Tests/Database/SelectSubqueryTest.php
index d36c9621e5533d9ad16471b85c55de808955f7f2..544c7b1545d14a69343b95c400df88b1ddcb14c8 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Database/SelectSubqueryTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Database/SelectSubqueryTest.php
@@ -8,7 +8,7 @@
 namespace Drupal\system\Tests\Database;
 
 /**
- * Test case for subselects in a dynamic SELECT query.
+ * Tests for subselects in a dynamic SELECT query.
  */
 class SelectSubqueryTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/lib/Drupal/system/Tests/Database/SelectTableSortDefaultTest.php b/core/modules/system/lib/Drupal/system/Tests/Database/SelectTableSortDefaultTest.php
index a84894710bf4f2da75ca1b460af1961279d59f86..c740292586e4ec68d14e80484849bcb8b856e60f 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Database/SelectTableSortDefaultTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Database/SelectTableSortDefaultTest.php
@@ -8,7 +8,7 @@
 namespace Drupal\system\Tests\Database;
 
 /**
- * Tests the tablesort query extender
+ * Tests the tablesort query extender.
  */
 class SelectTableSortDefaultTest extends DatabaseTestBase {
 
@@ -77,7 +77,7 @@ function testTableSortQueryFirst() {
   }
 
   /**
-   * Confirms that no error is thrown if a sort is not set in a default tableselect.
+   * Confirms that no error is thrown if no sort is set in a tableselect.
    */
   function testTableSortDefaultSort() {
     $this->drupalGet('database_test/tablesort_default_sort');
diff --git a/core/modules/system/lib/Drupal/system/Tests/Database/SelectTest.php b/core/modules/system/lib/Drupal/system/Tests/Database/SelectTest.php
index 802aef39e190d332f068bb5cc097c31e8a893e1c..85787b8fc81bf2c4495132c75c5ae0252c3665d5 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Database/SelectTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Database/SelectTest.php
@@ -368,7 +368,7 @@ function testRandomOrder() {
   }
 
   /**
-   * Tests that aliases are renamed when duplicates.
+   * Tests that aliases are renamed when they are duplicates.
    */
   function testSelectDuplicateAlias() {
     $query = db_select('test', 't');
diff --git a/core/modules/system/lib/Drupal/system/Tests/Database/UpdateTest.php b/core/modules/system/lib/Drupal/system/Tests/Database/UpdateTest.php
index 1558a92b1c7ab89fc307e8086b8c0817f18e4f9c..c5acd786c9cd05fc9994fff2d969abbf0115c056 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Database/UpdateTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Database/UpdateTest.php
@@ -8,7 +8,7 @@
 namespace Drupal\system\Tests\Database;
 
 /**
- * Updates builder tests.
+ * Tests the update query builder.
  */
 class UpdateTest extends DatabaseTestBase {
 
diff --git a/core/modules/system/lib/Drupal/system/Tests/System/ThemeTest.php b/core/modules/system/lib/Drupal/system/Tests/System/ThemeTest.php
index 3d0188d3ef3443fed81350a8b880aae22f2cf864..0c7ee721eaf0a876fd32fb461d0c4c01fb7bf217 100644
--- a/core/modules/system/lib/Drupal/system/Tests/System/ThemeTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/System/ThemeTest.php
@@ -10,7 +10,7 @@
 use Drupal\simpletest\WebTestBase;
 
 /**
- * Tests for the theme interface functionality.
+ * Tests the theme interface functionality.
  */
 class ThemeTest extends WebTestBase {
 
diff --git a/core/modules/system/lib/Drupal/system/Tests/Theme/RegistryTest.php b/core/modules/system/lib/Drupal/system/Tests/Theme/RegistryTest.php
index 3d47b89b357fb102d846d0d853b88c649fc17fc7..7ea187f572dfbc1a2b70c72b97d50aaebd32a663 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Theme/RegistryTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Theme/RegistryTest.php
@@ -11,7 +11,7 @@
 use Drupal\Core\Utility\ThemeRegistry;
 
 /**
- * Tests for the ThemeRegistry class.
+ * Tests the ThemeRegistry class.
  */
 class RegistryTest extends WebTestBase {
 
diff --git a/core/modules/system/lib/Drupal/system/Tests/Update/DependencyHookInvocationTest.php b/core/modules/system/lib/Drupal/system/Tests/Update/DependencyHookInvocationTest.php
index 7b03fde9079a535e0605cc9a6700e814a555ccc4..ec8b4680698ce95a1f0c4c401df3634fc65a1e34 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Update/DependencyHookInvocationTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Update/DependencyHookInvocationTest.php
@@ -10,7 +10,7 @@
 use Drupal\simpletest\WebTestBase;
 
 /**
- * Tests for the invocation of hook_update_dependencies().
+ * Tests the invocation of hook_update_dependencies().
  */
 class DependencyHookInvocationTest extends WebTestBase {
 
diff --git a/core/modules/system/lib/Drupal/system/Tests/Update/DependencyOrderingTest.php b/core/modules/system/lib/Drupal/system/Tests/Update/DependencyOrderingTest.php
index 6bd15345251a8eaf5fbd9987869dc2ebe117cdf0..f1d232f394ccf9e2542f2021865ab5c67e47ee32 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Update/DependencyOrderingTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Update/DependencyOrderingTest.php
@@ -10,7 +10,7 @@
 use Drupal\simpletest\WebTestBase;
 
 /**
- * Tests for the update dependency ordering system.
+ * Tests the update dependency ordering system.
  */
 class DependencyOrderingTest extends WebTestBase {
 
diff --git a/core/modules/system/lib/Drupal/system/Tests/Update/UpdateScriptTest.php b/core/modules/system/lib/Drupal/system/Tests/Update/UpdateScriptTest.php
index f3275a711d66dae5996e97c202e6e667a2544f63..e2201df2db4925eb92da3990b314dc3032bac1e0 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Update/UpdateScriptTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Update/UpdateScriptTest.php
@@ -10,7 +10,7 @@
 use Drupal\simpletest\WebTestBase;
 
 /**
- * Tests for the update system functionality.
+ * Tests the update system functionality.
  */
 class UpdateScriptTest extends WebTestBase {