diff -u b/core/modules/text/tests/src/Unit/Migrate/TextCckTest.php b/core/modules/text/tests/src/Unit/Migrate/TextCckTest.php
--- b/core/modules/text/tests/src/Unit/Migrate/TextCckTest.php
+++ b/core/modules/text/tests/src/Unit/Migrate/TextCckTest.php
@@ -147,7 +147,12 @@
       ['list_string', 'optionwidgets_buttons'],
       ['list_string', 'optionwidgets_select'],
       ['boolean', 'optionwidgets_onoff'],
-      ['text_long', 'text_textarea'],
+      ['text_long', 'text_textarea', [
+        'text_processing' => TRUE,
+      ]],
+      ['string_long', 'text_textarea', [
+        'text_processing' => FALSE,
+      ]],
       [NULL, 'undefined'],
     ];
   }