MFH. Enabling test as requested by the skipif comment... it does pass when slightly modified.

ext/mysqli/tests/mysqli_constants_categories.phpt

@@ -4,21 +4,15 @@ Constants exported by ext/mysqli - checking category - PHP bug not mysqli bug (c
 <?php
 require_once('skipif.inc');
 require_once('skipifemb.inc');
-require_once('connect.inc');
-if (!$TEST_EXPERIMENTAL)
-	die("skip This hits a known PHP bug, run the test from time to time and enable it once PHP got fixed");
 ?>
 --FILE--
 <?php
-	require("connect.inc");
-	require("table.inc");
-
 	$constants = get_defined_constants(true);
 
 	foreach ($constants as $group => $consts) {
 		foreach ($consts as $name => $value) {
 			if (stristr($name, 'mysqli')) {
-				if ('mysqli' !== $group)
+				if ('mysqli' != $group)
 				printf("found constant '%s' in group '%s'. expecting group 'mysqli'\n", $name, $group);
 			}
 		}