@@ -385,6 +386,19 @@ public function testDatetimeField() {
]);
$output=$this->renderTestEntity($id);
$this->assertStringContainsString((string)$expected,$output,newFormattableMarkup('Formatted date field using datetime_time_ago format displayed as %expected.',['%expected'=>$expected]));
// Test the required field validation error message.
$expected_error_message=newFormattableMarkup('The %field date is required. Please enter a date in the format %format.',['%field'=>$field_label,'%format'=>$arguments['%format']]);