add cust js api test

Signed-off-by: Nhuangke11 <huangke11@huawei.com>

global/cust/custjs/Test.json

@@ -13,7 +13,9 @@
             ],
             "type": "AppInstallKit",
             "cleanup-apps": true
-        }
+        },
+        {
+            "type": "ShellKit",
             "run-command": [
                 "mkdir -p /system/etc/custxml/",
                 "mkdir -p /sys-prod/etc/custxml/",
@@ -22,5 +24,6 @@
                 "touch /sys-prod/etc/custxml/both.xml",
                 "touch /sys-prod/etc/custxml/user.xml"
             ]
+        }
     ]
 }

global/cust/custjs/src/main/js/default/test/Cust.test.js

@@ -12,8 +12,9 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import cust from '@ohos.cust'
+
 import {describe, beforeAll, beforeEach, afterEach, afterAll, it, expect} from 'deccjsunit/index'
+import cust from '@ohos.cust'
 
 describe('CustTest', function () {
     console.log('CustTest**************************start');