Unit Tests: WP_UnitTest_Generator_Sequence needs a static incrementer - otherwise, it assumes every test class is a reset, which it no longer is (it is now static).

While we're at it, remove unnecessary `tearDown()` code.

See #30017, #33968.



git-svn-id: https://develop.svn.wordpress.org/trunk@35244 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/cache.php

@@ -4,7 +4,7 @@
  * @group cache
  */
 class Tests_Cache extends WP_UnitTestCase {
-	var $cache = NULL;
+	var $cache = null;
 
 	function setUp() {
 		parent::setUp();