!520 【misc软件服务子系统】wallpapaer部件增加api mock

Merge pull request !520 from wangdongqi/OpenHarmony-3.2-Beta2

runtime/main/extend/systemplugin/napi/ohos_wallpaper.js

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021 Huawei Device Co., Ltd.
+ * Copyright (c) 2021-2022 Huawei Device Co., Ltd.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
@@ -48,6 +48,18 @@ export function mockWallpaper() {
         })
       }
     },
+    getFile: function (...args) {
+      console.warn("wallpaper.getFile interface mocked in the Previewer. How this interface works on the" +
+        " Previewer may be different from that on a real device.")
+      const len = args.length
+      if (typeof args[len - 1] === 'function') {
+        args[len - 1].call(this, paramMock.businessErrorMock, paramMock.paramNumberMock)
+      } else {
+        return new Promise((resolve, reject) => {
+          resolve(paramMock.paramNumberMock);
+        })
+      }
+    },
     getMinHeight: function (...args) {
       console.warn("wallpaper.getMinHeight interface mocked in the Previewer. How this interface works on the" +
         " Previewer may be different from that on a real device.")