add show

src/app/services/db.service.spec.ts

@@ -0,0 +1,12 @@
+import {TestBed} from '@angular/core/testing';
+
+import {DbService} from './db.service';
+
+describe('DbService', () => {
+  beforeEach(() => TestBed.configureTestingModule({}));
+
+  it('should be created', () => {
+    const service: DbService = TestBed.get(DbService);
+    expect(service).toBeTruthy();
+  });
+});