First part of migrating Topo2 to GUI2

Change-Id: I316dd34cba161688e01dfb7b340bff5f2c3c57d4
diff --git a/web/gui2-fw-lib/projects/gui2-fw-lib/src/lib/layer/loading.service.spec.ts b/web/gui2-fw-lib/projects/gui2-fw-lib/src/lib/layer/loading.service.spec.ts
new file mode 100644
index 0000000..404439f
--- /dev/null
+++ b/web/gui2-fw-lib/projects/gui2-fw-lib/src/lib/layer/loading.service.spec.ts
@@ -0,0 +1,56 @@
+/*
+ *  Copyright 2018-present Open Networking Foundation
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+import { TestBed, inject } from '@angular/core/testing';
+
+import { LogService } from '../log.service';
+import { ConsoleLoggerService } from '../consolelogger.service';
+import { LoadingService } from './loading.service';
+import { FnService } from '../util/fn.service';
+import { ThemeService } from '../util/theme.service';
+import { WebSocketService } from '../remote/websocket.service';
+
+class MockFnService {
+    debug() {
+    }
+}
+
+class MockThemeService {}
+
+class MockWebSocketService {}
+
+/**
+ * ONOS GUI -- Layer -- Loading Service - Unit Tests
+ */
+describe('LoadingService', () => {
+    let log: LogService;
+
+    beforeEach(() => {
+        log = new ConsoleLoggerService();
+
+        TestBed.configureTestingModule({
+            providers: [LoadingService,
+                { provide: LogService, useValue: log },
+                { provide: FnService, useClass: MockFnService },
+                { provide: ThemeService, useClass: MockThemeService },
+                { provide: WebSocketService, useClass: MockWebSocketService },
+            ]
+        });
+    });
+
+    it('should be created', inject([LoadingService], (service: LoadingService) => {
+        expect(service).toBeTruthy();
+    }));
+});