tests(core): add app config service tests

npm/ng-packs/packages/core/src/lib/tests/application-configuration.service.spec.ts

@@ -0,0 +1,20 @@
+import { createHttpFactory, HttpMethod, SpectatorHttp } from '@ngneat/spectator/jest';
+import { ApplicationConfigurationService, RestService } from '../services';
+import { Store } from '@ngxs/store';
+
+describe('ApplicationConfigurationService', () => {
+  let spectator: SpectatorHttp<ApplicationConfigurationService>;
+  const createHttp = createHttpFactory({
+    dataService: ApplicationConfigurationService,
+    providers: [RestService],
+    mocks: [Store],
+  });
+
+  beforeEach(() => (spectator = createHttp()));
+
+  it('can test HttpClient.get', () => {
+    spectator.get(Store).selectSnapshot.andReturn('https://abp.io');
+    spectator.service.getConfiguration().subscribe();
+    spectator.expectOne('https://abp.io/api/abp/application-configuration', HttpMethod.GET);
+  });
+});