sign components test fix

src/app/lnd/sign-verify-message/sign/sign.component.spec.ts

@@ -1,14 +1,20 @@
 import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { DataService } from '../../../shared/services/data.service';
 
 import { SignComponent } from './sign.component';
 
 describe('SignComponent', () => {
   let component: SignComponent;
   let fixture: ComponentFixture<SignComponent>;
+  const mockDataService = jasmine.createSpyObj("DataService", ["getChildAPIUrl","setChildAPIUrl","getFiatRates",
+  "getAliasesFromPubkeys","signMessage","verifyMessage","handleErrorWithoutAlert","handleErrorWithAlert"]);
 
   beforeEach(async(() => {
     TestBed.configureTestingModule({
-      declarations: [ SignComponent ]
+      declarations: [ SignComponent ],
+      providers: [
+        { provide: DataService, useValue: mockDataService }
+      ]
     })
     .compileComponents();
   }));