Fix fileupload defaults not applied (#7086)

* added fileUpload definition default value

* added undefined and null as invalid

* removed explicit default value reference

* improved test grouping in describes

src/Config.js

@@ -250,11 +250,15 @@ export class Config {
   }
 
   static validateFileUploadOptions(fileUpload) {
-    if (!fileUpload) {
-      fileUpload = {};
-    }
-    if (typeof fileUpload !== 'object' || fileUpload instanceof Array) {
-      throw 'fileUpload must be an object value.';
+    try {
+      if (fileUpload == null || typeof fileUpload !== 'object' || fileUpload instanceof Array) {
+        throw 'fileUpload must be an object value.';
+      }
+    } catch (e) {
+      if (e instanceof ReferenceError) {
+        return;
+      }
+      throw e;
     }
     if (fileUpload.enableForAnonymousUser === undefined) {
       fileUpload.enableForAnonymousUser = FileUploadOptions.enableForAnonymousUser.default;

src/Options/index.js

@@ -199,7 +199,8 @@ export interface ParseServerOptions {
   :DEFAULT: false */
   idempotencyOptions: ?IdempotencyOptions;
   /* Options for file uploads
-  :ENV: PARSE_SERVER_FILE_UPLOAD_OPTIONS */
+  :ENV: PARSE_SERVER_FILE_UPLOAD_OPTIONS
+  :DEFAULT: {} */
   fileUpload: ?FileUploadOptions;
   /* Full path to your GraphQL custom schema.graphql file */
   graphQLSchema: ?string;