add reset for memory cache

Author: selul

inc/attachment_cache.php

@@ -11,7 +11,12 @@ class Optml_Attachment_Cache {
 	 * @var array
 	 */
 	private static $cache_map = [];
-
+	/**
+	 * Reset the memory cache.
+	 */
+	public static function reset() {
+		self::$cache_map = [];
+	}
 	/**
 	 * Get the cached attachment ID.
 	 *

tests/test-media.php

@@ -418,6 +418,7 @@ public function test_replace_alternative_domain(){
 		$this->assertEquals( $this->attachment_url_to_post_id( $scaled_url ), self::$sample_attachment_scaled );
 	}
 	public function test_replace_urls_in_editor_content() {
+		Optml_Attachment_Cache::reset();
 		// Sample attachment:
 		$original_url = Optml_Media_Offload::get_original_url( self::$sample_attachement );
 		$extension = pathinfo( $original_url, PATHINFO_EXTENSION );