Fix test_should_enqueue_stored_styles by cleaning up global state

Author: westonruter

src/wp-includes/script-loader.php

@@ -3232,7 +3232,7 @@ static function () use ( $style ) {
  * }
  */
 function wp_enqueue_stored_styles( $options = array() ) {
-	$is_block_theme   = wp_is_block_theme();
+	$is_block_theme   = wp_is_block_theme(); // TODO: Shouldn't this rather check wp_should_load_block_assets_on_demand()? It should be something like $is_printing_styles_late.
 	$is_classic_theme = ! $is_block_theme;
 
 	/*

tests/phpunit/tests/theme/wpEnqueueStoredStyles.php

@@ -24,6 +24,9 @@ class Tests_Themes_WpEnqueueStoredStyles extends WP_Theme_UnitTestCase {
 	public function set_up() {
 		parent::set_up();
 
+		// TODO: This shouldn't be needed here. It should be done as part of the test that added the store.
+		WP_Style_Engine_CSS_Rules_Store::remove_all_stores();
+
 		global $wp_scripts, $wp_styles;
 		$this->original_wp_scripts = $wp_scripts;
 		$this->original_wp_styles  = $wp_styles;
@@ -45,6 +48,9 @@ public function tear_down() {
 	 * Tests that stored CSS is enqueued.
 	 *
 	 * @ticket 56467
+	 *
+	 * @covers ::wp_style_engine_get_stylesheet_from_css_rules
+	 * @covers ::wp_enqueue_stored_styles
 	 */
 	public function test_should_enqueue_stored_styles() {
 		$core_styles_to_enqueue = array(