add cust js api test

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

global/cust/custjs/Test.json

@@ -13,14 +13,17 @@
             ],
             "type": "AppInstallKit",
             "cleanup-apps": true
+        },
+        {
+            "type": "ShellKit",
+            "run-command": [
+                "mkdir -p /system/etc/custxml/",
+                "mkdir -p /sys-prod/etc/custxml/",
+                "touch /system/etc/custxml/system.xml",
+                "touch /system/etc/custxml/both.xml",
+                "touch /sys-prod/etc/custxml/both.xml",
+                "touch /sys-prod/etc/custxml/user.xml"
+            ]
         }
-        "run-command": [
-            "mkdir -p /system/etc/custxml/",
-            "mkdir -p /sys-prod/etc/custxml/",
-            "touch /system/etc/custxml/system.xml",
-            "touch /system/etc/custxml/both.xml",
-            "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');
@@ -145,4 +146,4 @@ describe('CustTest', function () {
     })
 
     console.log('CustTest**************************end');
-})
\ No newline at end of file
+})