diff --git a/core/modules/field/tests/field.test b/core/modules/field/tests/field.test
index 214eab4..af5591a 100644
--- a/core/modules/field/tests/field.test
+++ b/core/modules/field/tests/field.test
@@ -2379,6 +2379,44 @@ class FieldCrudTestCase extends FieldTestCase {
   }
 }
 
+class FieldSchemaAlterTestCase extends FieldTestCase {
+  public static function getInfo() {
+    return array(
+      'name' => 'Field schema alteration tests',
+      'description' => 'Alter the schema for a given type of field.',
+      'group' => 'Field API',
+    );
+  }
+
+  function setUp() {
+    parent::setUp('field_test', 'field_test_schema_alter');
+  }
+
+  /**
+   * Test that new image field gets an altered alt column and a new column.
+   */
+  function testImageFieldSchemaAlter() {
+    $test_field = array(
+      'field_name' => drupal_strtolower($this->randomName()),
+      'type' => 'test_field',
+    );
+    field_create_field($test_field);
+    $test_field_name = $test_field['field_name'];
+    $test_field_instance_settings = array(
+      'field_name' => $test_field_name,
+      'entity_type' => 'test_entity',
+      'bundle' => 'test_bundle',
+      'deleted' => 0,
+    );
+    $test_field_instance = field_create_instance($test_field_instance_settings);
+
+    $table_name = _field_sql_storage_tablename($test_field_instance);
+    $schema = drupal_get_schema($table_name, TRUE);
+    $this->assertEqual('float', $schema['fields'][$test_field_name .'_value']['type']);
+    $this->assertTrue(db_field_exists($table_name, $test_field_name .'_additional_column'));
+  }
+}
+
 class FieldInstanceCrudTestCase extends FieldTestCase {
   protected $field;
 
diff --git a/core/modules/field/tests/field_test_schema_alter.info b/core/modules/field/tests/field_test_schema_alter.info
new file mode 100644
index 0000000..5b2ee0d
--- /dev/null
+++ b/core/modules/field/tests/field_test_schema_alter.info
@@ -0,0 +1,6 @@
+name = "Field API Schema Alter Test"
+description = "Support module for the Field API schema alter tests."
+core = 8.x
+package = Testing
+version = VERSION
+hidden = TRUE
diff --git a/core/modules/field/tests/field_test_schema_alter.module b/core/modules/field/tests/field_test_schema_alter.module
new file mode 100644
index 0000000..0fc8222
--- /dev/null
+++ b/core/modules/field/tests/field_test_schema_alter.module
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * @file
+ * Helper module for the Field API schema alter tests.
+ */
+
+/**
+ * Implements hook_field_schema_alter().
+ */
+function field_test_schema_alter_field_schema_alter(&$schema, $field) {
+  if ($field['type'] == 'test_field') {
+    // Alter the field type.
+    $schema['columns']['value']['type'] = 'float';
+    // Add an addtional column of data.
+    $schema['columns']['additional_column'] = array(
+        'description' => "Addtional column added to image field table.",
+        'type' => 'varchar',
+        'length' => 128,
+        'not null' => FALSE,
+    );
+  }
+}