fix wpRegisterAbility tests

Author: jorgefilipecosta

tests/phpunit/tests/abilities-api/wpRegisterAbilityCategory.php

@@ -26,6 +26,12 @@ public function set_up(): void {
 			'label'       => 'Math',
 			'description' => 'Mathematical operations.',
 		);
+
+		// Unregister all ability categories to ensure a clean slate for each test.
+		foreach ( wp_get_ability_categories() as $ability_category ) {
+			wp_unregister_ability_category( $ability_category->get_slug() );
+		}
+		remove_action( 'wp_abilities_api_categories_init', 'wp_register_core_ability_categories' );
 	}
 
 	/**
@@ -52,6 +58,10 @@ public function tear_down(): void {
 	 * @expectedIncorrectUsage wp_register_ability_category
 	 */
 	public function test_register_category_before_init_hook(): void {
+		// simulate that the 'wp_abilities_api_categories_init' action has not yet fired.
+		global $wp_actions;
+		$wp_actions[ 'wp_abilities_api_categories_init' ] = 0;
+
 		$result = wp_register_ability_category(
 			self::$test_ability_category_name,
 			self::$test_ability_category_args