feat: add functionality for codes component (#309)

src/app/system/system.service.spec.ts

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