Fix item opertation test issue

src/app/+item-page/edit-item-page/item-operation/item-operation.component.spec.ts

@@ -4,11 +4,11 @@ import {ItemOperationComponent} from './item-operation.component';
 import {TranslateModule} from '@ngx-translate/core';
 import {By} from '@angular/platform-browser';
 
-const itemOperation: ItemOperation = new ItemOperation('key1', 'url1');
-
-let fixture;
-let comp;
 describe('ItemOperationComponent', () => {
+  let itemOperation: ItemOperation;
+
+  let fixture;
+  let comp;
 
   beforeEach(async(() => {
     TestBed.configureTestingModule({
@@ -19,6 +19,8 @@ describe('ItemOperationComponent', () => {
 
   beforeEach(() => {
 
+    itemOperation = new ItemOperation('key1', 'url1');
+
     fixture = TestBed.createComponent(ItemOperationComponent);
     comp = fixture.componentInstance;
     comp.operation = itemOperation;