.../tests/src/Functional/ConfigImportAllTest.php   |  3 +
 .../Drupal/KernelTests/Config/TypedConfigTest.php  |  7 +-
 .../KernelTests/Core/Config/DefaultConfigTest.php  | 76 ----------------------
 .../Core/Config/SchemaCheckTraitTest.php           |  5 ++
 4 files changed, 14 insertions(+), 77 deletions(-)

diff --git a/core/modules/config/tests/src/Functional/ConfigImportAllTest.php b/core/modules/config/tests/src/Functional/ConfigImportAllTest.php
index c04c0eb9ac..10e6d47101 100644
--- a/core/modules/config/tests/src/Functional/ConfigImportAllTest.php
+++ b/core/modules/config/tests/src/Functional/ConfigImportAllTest.php
@@ -11,6 +11,9 @@
 /**
  * Tests the largest configuration import possible with all available modules.
  *
+ * Note that the use of SchemaCheckTestTrait means that the schema conformance
+ * of all default configuration is also tested.
+ *
  * @group config
  */
 class ConfigImportAllTest extends ModuleTestBase {
diff --git a/core/tests/Drupal/KernelTests/Config/TypedConfigTest.php b/core/tests/Drupal/KernelTests/Config/TypedConfigTest.php
index adba8b8e0b..47bd91b1e0 100644
--- a/core/tests/Drupal/KernelTests/Config/TypedConfigTest.php
+++ b/core/tests/Drupal/KernelTests/Config/TypedConfigTest.php
@@ -24,6 +24,11 @@ class TypedConfigTest extends KernelTestBase {
    */
   protected static $modules = ['config_test'];
 
+  /**
+   * {@inheritdoc}
+   */
+  protected static $configSchemaCheckerExclusions = ['config_test.validation'];
+
   /**
    * {@inheritdoc}
    */
@@ -86,7 +91,7 @@ public function testTypedDataAPI() {
     $typed_config_manager = \Drupal::service('config.typed');
     $typed_config = $typed_config_manager->createFromNameAndData('config_test.validation', \Drupal::configFactory()->get('config_test.validation')->get());
     $this->assertInstanceOf(TypedConfigInterface::class, $typed_config);
-    $this->assertEquals(['_core', 'llama', 'cat', 'giraffe', 'uuid'], array_keys($typed_config->getElements()));
+    $this->assertEquals(['_core', 'llama', 'cat', 'giraffe', 'uuid', 'langcode'], array_keys($typed_config->getElements()));
 
     $config_test_entity = \Drupal::entityTypeManager()->getStorage('config_test')->create([
       'id' => 'asterix',
diff --git a/core/tests/Drupal/KernelTests/Core/Config/DefaultConfigTest.php b/core/tests/Drupal/KernelTests/Core/Config/DefaultConfigTest.php
deleted file mode 100644
index 483d104c8c..0000000000
--- a/core/tests/Drupal/KernelTests/Core/Config/DefaultConfigTest.php
+++ /dev/null
@@ -1,76 +0,0 @@
-<?php
-
-namespace Drupal\KernelTests\Core\Config;
-
-use Drupal\Tests\SchemaCheckTestTrait;
-use Drupal\config_test\TestInstallStorage;
-use Drupal\Core\Config\InstallStorage;
-use Drupal\Core\DependencyInjection\ContainerBuilder;
-use Drupal\KernelTests\KernelTestBase;
-use Symfony\Component\DependencyInjection\Reference;
-
-/**
- * Tests that default configuration provided by all modules matches schema.
- *
- * @group config
- */
-class DefaultConfigTest extends KernelTestBase {
-
-  use SchemaCheckTestTrait;
-
-  /**
-   * Modules to enable.
-   *
-   * @var array
-   */
-  protected static $modules = ['system', 'config_test'];
-
-  /**
-   * Config files to be ignored by this test.
-   *
-   * @var array
-   */
-  protected $toSkip = [
-    // Skip files provided by the config_schema_test module since that module
-    // is explicitly for testing schema.
-    'config_schema_test.ignore',
-    'config_schema_test.noschema',
-    'config_schema_test.plugin_types',
-    'config_schema_test.someschema.somemodule.section_one.subsection',
-    'config_schema_test.someschema.somemodule.section_two.subsection',
-    'config_schema_test.someschema.with_parents',
-    'config_schema_test.someschema',
-  ];
-
-  /**
-   * {@inheritdoc}
-   */
-  public function register(ContainerBuilder $container) {
-    parent::register($container);
-    $container->register('default_config_test.schema_storage')
-      ->setClass('\Drupal\config_test\TestInstallStorage')
-      ->addArgument(InstallStorage::CONFIG_SCHEMA_DIRECTORY);
-
-    $definition = $container->getDefinition('config.typed');
-    $definition->replaceArgument(1, new Reference('default_config_test.schema_storage'));
-  }
-
-  /**
-   * Tests default configuration data type.
-   */
-  public function testDefaultConfig() {
-    $typed_config = \Drupal::service('config.typed');
-    // Create a configuration storage with access to default configuration in
-    // every module, profile and theme.
-    $default_config_storage = new TestInstallStorage();
-    foreach ($default_config_storage->listAll() as $config_name) {
-      if (in_array($config_name, $this->toSkip)) {
-        continue;
-      }
-
-      $data = $default_config_storage->read($config_name);
-      $this->assertConfigSchema($typed_config, $config_name, $data);
-    }
-  }
-
-}
diff --git a/core/tests/Drupal/KernelTests/Core/Config/SchemaCheckTraitTest.php b/core/tests/Drupal/KernelTests/Core/Config/SchemaCheckTraitTest.php
index 97699eeb99..bd89523a54 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/SchemaCheckTraitTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/SchemaCheckTraitTest.php
@@ -56,9 +56,14 @@ public function testTrait() {
     $config_data['boolean'] = [];
     $ret = $this->checkConfigSchema($this->typedConfig, 'config_test.types', $config_data);
     $expected = [
+      // Storage type check errors.
+      // @see \Drupal\Core\Config\Schema\SchemaCheckTrait::checkValue()
       'config_test.types:new_key' => 'missing schema',
       'config_test.types:new_array' => 'missing schema',
       'config_test.types:boolean' => 'non-scalar value but not defined as an array (such as mapping or sequence)',
+      // Validation constraints violations.
+      // @see \Drupal\Core\TypedData\TypedDataInterface::validate()
+      '0' => '[boolean] This value should be of the correct primitive type.',
     ];
     $this->assertEquals($expected, $ret);
   }