WPDB: Sanity check that any strings being stored in the DB are not too long to store correctly.

git-svn-id: https://develop.svn.wordpress.org/trunk@32299 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/db.php

@@ -747,6 +747,7 @@ class Tests_DB extends WP_UnitTestCase {
 				'format' => '%s',
 				'charset' => $expected_charset,
 				'ascii' => false,
+				'length' => $wpdb->get_col_length( $wpdb->posts, 'post_content' ),
 			)
 		);