diff --git a/modules/simpletest/tests/field_test.module b/modules/simpletest/tests/field_test.module
index 4c2607d99a55309ecf520ecda20924f759474568..95110792a86d632b2edbbfb6ff4b199f25f1acb0 100644
--- a/modules/simpletest/tests/field_test.module
+++ b/modules/simpletest/tests/field_test.module
@@ -523,4 +523,11 @@ function theme_field_formatter_field_test_multiple($element) {
   }
   $output = implode('|', $items);
   return $settings['test_formatter_setting_multiple'] . '|' . $output;
+}
+
+/**
+ * Sample function to test default value assignment.
+ */
+function field_test_default_value($obj_type, $object, $field, $instance) {
+  return array(array('value' => 99));
 }
\ No newline at end of file