diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigSchemaTest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigSchemaTest.php
index b372128..e701d39 100644
--- a/core/modules/config/lib/Drupal/config/Tests/ConfigSchemaTest.php
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigSchemaTest.php
@@ -48,7 +48,7 @@ function testSchemaMapping() {
     $expected['class'] = '\Drupal\Core\Config\Schema\Undefined';
     $this->assertEqual($definition, $expected, 'Retrieved the right metadata for nonexistent configuration.');
 
-    // Configuration file without schema will return Unknown as well.
+    // Configuration file without schema will return Undefined as well.
     $this->assertIdentical(FALSE, \Drupal::service('config.typed')->hasConfigSchema('config_schema_test.noschema'));
     $definition = \Drupal::service('config.typed')->getDefinition('config_schema_test.noschema');
     $this->assertEqual($definition, $expected, 'Retrieved the right metadata for configuration with no schema.');
@@ -93,6 +93,39 @@ function testSchemaMapping() {
     );
     $this->assertEqual($definition, $expected, 'Retrieved the right metadata for system.maintenance');
 
+    // Mixed schema with ignore elements.
+    $definition = \Drupal::service('config.typed')->getDefinition('config_schema_test.ignore');
+    $expected = array();
+    $expected['label'] = 'Ignore test';
+    $expected['class'] = '\Drupal\Core\Config\Schema\Mapping';
+    $expected['mapping']['label'] = array(
+      'label' =>  'Label',
+      'type' => 'label',
+    );
+    $expected['mapping']['irrelevant'] = array(
+      'label' => 'Irrelevant',
+      'type' => 'ignore',
+    );
+    $expected['mapping']['indescribable'] = array(
+      'label' => 'Indescribable',
+      'type' => 'ignore',
+    );
+    $expected['mapping']['weight'] = array(
+      'label' => 'Weight',
+      'type' => 'integer',
+    );
+    $this->assertEqual($definition, $expected, 'Retrieved the right metadata for config_schema_test.ignore');
+
+    // The ignore elements themselves.
+    $definition = \Drupal::service('config.typed')->getDefinition('config_schema_test.ignore.irrelevant');
+    $expected = array();
+    $expected['label'] = 'Irrelevant';
+    $expected['type'] = 'ignore';
+    $this->assertEqual($definition, $expected, 'Retrieved the right metadata for config_schema_test.ignore.irrelevant');
+    $definition = \Drupal::service('config.typed')->getDefinition('config_schema_test.ignore.indescribable');
+    $expected['label'] = 'Indescribable';
+    $this->assertEqual($definition, $expected, 'Retrieved the right metadata for config_schema_test.ignore.indescribable');
+
     // More complex case, generic type. Metadata for image style.
     $definition = \Drupal::service('config.typed')->getDefinition('image.style.large');
     $expected = array();
@@ -138,7 +171,7 @@ function testSchemaMapping() {
 
     $this->assertEqual($definition, $expected, 'Retrieved the right metadata for the first effect of image.style.medium');
 
-    // More complex, multiple filesystem marker test.
+    // More complex, several level deep test.
     $definition = \Drupal::service('config.typed')->getDefinition('config_schema_test.someschema.somemodule.section_one.subsection');
     // This should be the schema of config_schema_test.someschema.somemodule.*.*.
     $expected = array();
diff --git a/core/modules/config/tests/config_schema_test/config/install/config_schema_test.ignore.yml b/core/modules/config/tests/config_schema_test/config/install/config_schema_test.ignore.yml
new file mode 100644
index 0000000..3b64ae9
--- /dev/null
+++ b/core/modules/config/tests/config_schema_test/config/install/config_schema_test.ignore.yml
@@ -0,0 +1,9 @@
+label: 'Label string'
+irrelevant: 123
+indescribable:
+  abc: 789
+  def:
+   - 456
+   - 'abc'
+  xyz: 13.4
+weight: 27
diff --git a/core/modules/config/tests/config_schema_test/config/schema/config_schema_test.schema.yml b/core/modules/config/tests/config_schema_test/config/schema/config_schema_test.schema.yml
index 9eec7d7..ce13363 100644
--- a/core/modules/config/tests/config_schema_test/config/schema/config_schema_test.schema.yml
+++ b/core/modules/config/tests/config_schema_test/config/schema/config_schema_test.schema.yml
@@ -132,3 +132,20 @@ config_schema_test.schema_in_install:
 config_schema_test_integer:
   type: integer
   label: 'Config test integer'
+
+config_schema_test.ignore:
+  type: mapping
+  label: 'Ignore test'
+  mapping:
+    label:
+      type: label
+      label: 'Label'
+    irrelevant:
+      type: ignore
+      label: 'Ignore'
+    indescribable:
+      type: ignore
+      label: 'Indescribable'
+    weight:
+      type: integer
+      label: 'Weight'