Change file destroy error message

src/ParseError.js

@@ -343,6 +343,14 @@ ParseError.INVALID_PUSH_TIME_ERROR = 152;
  */
 ParseError.FILE_DELETE_ERROR = 153;
 
+/**
+ * Error code indicating an error deleting an unnamed file.
+ *
+ * @property {number} FILE_DELETE_UNNAMED_ERROR
+ * @static
+ */
+ParseError.FILE_DELETE_UNNAMED_ERROR = 161;
+
 /**
  * Error code indicating that the application has exceeded its request
  * limit.

src/ParseFile.js

@@ -12,6 +12,8 @@
 import CoreManager from './CoreManager';
 import type { FullOptions } from './RESTController';
 
+const ParseError = require('./ParseError').default;
+
 let XHR = null;
 if (typeof XMLHttpRequest !== 'undefined') {
   XHR = XMLHttpRequest;
@@ -314,13 +316,13 @@ class ParseFile {
 
   /**
    * Deletes the file from the Parse cloud.
-   * In Cloud Code and Node only with Master Key
+   * In Cloud Code and Node only with Master Key.
    *
    * @returns {Promise} Promise that is resolved when the delete finishes.
    */
   destroy() {
     if (!this._name) {
-      throw new Error('Cannot delete an unsaved ParseFile.');
+      throw new ParseError(ParseError.FILE_DELETE_UNNAMED_ERROR, 'Cannot delete an unnamed file.');
     }
     const controller = CoreManager.getFileController();
     return controller.deleteFile(this._name).then(() => {

src/__tests__/ParseFile-test.js

@@ -820,7 +820,7 @@ describe('FileController', () => {
     try {
       await file.destroy();
     } catch (e) {
-      expect(e.message).toBe('Cannot delete an unsaved ParseFile.');
+      expect(e.code).toBe(ParseError.FILE_DELETE_UNNAMED_ERROR);
       done();
     }
   });