diff --git a/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php b/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php
index 0805bc1..5752868 100644
--- a/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php
+++ b/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php
@@ -191,6 +191,30 @@ public function __construct($test_id = NULL) {
   }
 
   /**
+   * Provides meta information about this test case such as test name.
+   *
+   * @return array
+   *   An array of untranslated strings with the following keys:
+   *   - name: An overview of what is tested by the class; for example, "User
+   *     access rules".
+   *   - description: One sentence describing the test, starting with a verb.
+   *   - group: The human-readable name of the module ("Node", "Statistics"), or
+   *     the human-readable name of the Drupal facility tested (e.g. "Form API"
+   *     or "XML-RPC").
+   */
+  public static function getInfo() {
+    // PHP does not allow us to declare this method as abstract public static,
+    // so we simply throw an exception here if this has not been implemented by
+    // a child class.
+    throw new \RuntimeException("Sub-class must implement the getInfo method!");
+  }
+
+  /**
+   * Performs setup tasks before each individual test method is run.
+   */
+  abstract protected function setUp();
+
+  /**
    * Checks the matching requirements for Test.
    *
    * @return
@@ -1010,6 +1034,8 @@ protected function rebuildContainer() {
   }
 
   /**
+   * Performs cleanup tasks after each individual test method has been run.
+   *
    * Deletes created files, database tables, and reverts environment changes.
    *
    * This method needs to be invoked for both unit and integration tests.
diff --git a/core/modules/simpletest/simpletest.module b/core/modules/simpletest/simpletest.module
index 1c17909..37140cb 100644
--- a/core/modules/simpletest/simpletest.module
+++ b/core/modules/simpletest/simpletest.module
@@ -480,7 +480,14 @@ function simpletest_test_get_all() {
       foreach ($classes as $class) {
         // Test classes need to implement getInfo() to be valid.
         if (class_exists($class) && method_exists($class, 'getInfo')) {
-          $info = call_user_func(array($class, 'getInfo'));
+          try {
+            $info = call_user_func(array($class, 'getInfo'));
+          }
+          catch (\RuntimeException $e) {
+            // A run time exception indicates that this is an abstract base
+            // class, so we skip it.
+            continue;
+          }
 
           // If this test class requires a non-existing module, skip it.
           if (!empty($info['dependencies'])) {
diff --git a/core/tests/Drupal/Tests/UnitTestCase.php b/core/tests/Drupal/Tests/UnitTestCase.php
index c8f32a6..8f06aee 100644
--- a/core/tests/Drupal/Tests/UnitTestCase.php
+++ b/core/tests/Drupal/Tests/UnitTestCase.php
@@ -23,12 +23,13 @@
    * method. Sub-classes should always override it.
    *
    * @return array
-   *   An array describing the test like so:
-   *   array(
-   *     'name' => 'Something Test',
-   *     'description' => 'Tests Something',
-   *     'group' => 'Something',
-   *   )
+   *   An array of untranslated strings with the following keys:
+   *   - name: An overview of what is tested by the class; for example, "User
+   *     access rules".
+   *   - description: One sentence describing the test, starting with a verb.
+   *   - group: The human-readable name of the module ("Node", "Statistics"), or
+   *     the human-readable name of the Drupal facility tested (e.g. "Form API"
+   *     or "XML-RPC").
    */
   public static function getInfo() {
     throw new \RuntimeException("Sub-class must implement the getInfo method!");