diff -u b/core/lib/Drupal/Core/ConfigThingie/ConfigThingieBase.php b/core/lib/Drupal/Core/ConfigThingie/ConfigThingieBase.php
--- b/core/lib/Drupal/Core/ConfigThingie/ConfigThingieBase.php
+++ b/core/lib/Drupal/Core/ConfigThingie/ConfigThingieBase.php
@@ -56,21 +56,34 @@
   }
 
   /**
-   * Implements Drupal\Core\ConfigThingie\ConfigThingieInterface::getConfigPrefix().
+   * Returns the configuration thingie object's name prefix.
+   *
+   * @return string
+   *   The configuration object name prefix; e.g., for a 'node.type.article'
+   *   thingie, this returns 'node.type'.
    */
-  public function getConfigPrefix() {
-    return 'config_test.dynamic';
-  }
+  abstract public function getConfigPrefix();
 
   /**
-   * Implements Drupal\Core\ConfigThingie\ConfigThingieInterface::getConfigName().
+   * Returns the fully qualified configuration object name for this configuration thingie.
+   *
+   * @return string
+   *   The configuration object name for this configuration thingie. Normally,
+   *   ConfigThingieInterface::getConfigPrefix() and
+   *   ConfigThingieInterface::getID() form the full configuration object name;
+   *   i.e., '[prefix].[id]'.
    */
   public function getConfigName() {
     return $this->getConfigPrefix() . '.' . $this->getID();
   }
 
   /**
-   * Implements Drupal\Core\ConfigThingie\ConfigThingieInterface::getEventBasename().
+   * Returns the basename used for events/hooks for this configuration thingie.
+   *
+   * @return string
+   *   The basename for events/hooks; e.g., for a 'node.type.article' thingie,
+   *   this returns 'node_type'. Normally, this is auto-generated based on
+   *   ConfigThingieInterface::getConfigPrefix().
    */
   public function getEventBasename() {
     return str_replace('.', '_', $this->getConfigPrefix());
diff -u b/core/lib/Drupal/Core/ConfigThingie/ConfigThingieInterface.php b/core/lib/Drupal/Core/ConfigThingie/ConfigThingieInterface.php
--- b/core/lib/Drupal/Core/ConfigThingie/ConfigThingieInterface.php
+++ b/core/lib/Drupal/Core/ConfigThingie/ConfigThingieInterface.php
@@ -14,36 +14,6 @@
  */
 interface ConfigThingieInterface {
   /**
-   * Returns the configuration thingie object's name prefix.
-   *
-   * @return string
-   *   The configuration object name prefix; e.g., for a 'node.type.article'
-   *   thingie, this returns 'node.type'.
-   */
-  public function getConfigPrefix();
-
-  /**
-   * Returns the fully qualified configuration object name for this configuration thingie.
-   *
-   * @return string
-   *   The configuration object name for this configuration thingie. Normally,
-   *   ConfigThingieInterface::getConfigPrefix() and
-   *   ConfigThingieInterface::getID() form the full configuration object name;
-   *   i.e., '[prefix].[id]'.
-   */
-  public function getConfigName();
-
-  /**
-   * Returns the basename used for events/hooks for this configuration thingie.
-   *
-   * @return string
-   *   The basename for events/hooks; e.g., for a 'node.type.article' thingie,
-   *   this returns 'node_type'. Normally, this is auto-generated based on
-   *   ConfigThingieInterface::getConfigPrefix().
-   */
-  public function getEventBasename();
-
-  /**
    * Returns the ID (machine name) of this configuration thingie.
    *
    * @return string
only in patch2:
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigInstallTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigInstallTest.php
@@ -46,5 +46,14 @@ class ConfigInstallTest extends WebTestBase {
     // Verify that configuration import callback was invoked for the dynamic
     // thingie.
     $this->assertTrue($GLOBALS['hook_config_import']);
+
+    // Verify that config_test API hooks were invoked for the dynamic default
+    // thingie.
+    $this->assertTrue(isset($GLOBALS['hook_config_test_dynamic']['load']));
+    $this->assertTrue(isset($GLOBALS['hook_config_test_dynamic']['presave']));
+    $this->assertTrue(isset($GLOBALS['hook_config_test_dynamic']['insert']));
+    $this->assertFalse(isset($GLOBALS['hook_config_test_dynamic']['update']));
+    $this->assertFalse(isset($GLOBALS['hook_config_test_dynamic']['predelete']));
+    $this->assertFalse(isset($GLOBALS['hook_config_test_dynamic']['delete']));
   }
 }