.../filter/tests/src/Kernel/Plugin/migrate/process/FilterIdTest.php     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/modules/filter/tests/src/Kernel/Plugin/migrate/process/FilterIdTest.php b/core/modules/filter/tests/src/Kernel/Plugin/migrate/process/FilterIdTest.php
index 02cc83769a..9e6e078c77 100644
--- a/core/modules/filter/tests/src/Kernel/Plugin/migrate/process/FilterIdTest.php
+++ b/core/modules/filter/tests/src/Kernel/Plugin/migrate/process/FilterIdTest.php
@@ -66,7 +66,7 @@ public function testTransform($value, $expected_value, $invalid_id = NULL) {
         ->expects($this->exactly(1))
         ->method('saveMessage')
         ->with(
-          'Filter ' . $invalid_id . ' could not be mapped to an existing filter plugin; defaulting to filter_null.',
+          'Filter ' . $invalid_id . ' could not be mapped to an existing filter plugin; defaulting to filter_null and dropping all settings. Either redo the migration with a viable successor, or modify the text format after the migration to remove this filter if it is no longer necessary.',
           MigrationInterface::MESSAGE_WARNING
         );
     }