Added d3 force graph to GUI2 topology

Change-Id: I6860472efaf51ea27fad74e630e687f0c6abad3d
diff --git a/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/visuals/linkvisual.component.spec.ts b/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/visuals/linkvisual.component.spec.ts
new file mode 100644
index 0000000..c060aab
--- /dev/null
+++ b/web/gui2/src/main/webapp/app/view/topology/layer/forcesvg/visuals/linkvisual.component.spec.ts
@@ -0,0 +1,40 @@
+/*
+ * 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 { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { LinkVisualComponent } from './linkvisual.component';
+
+describe('LinkVisualComponent', () => {
+    let component: LinkVisualComponent;
+    let fixture: ComponentFixture<LinkVisualComponent>;
+
+    beforeEach(async(() => {
+        TestBed.configureTestingModule({
+          declarations: [ LinkVisualComponent ]
+        })
+        .compileComponents();
+    }));
+
+    beforeEach(() => {
+        fixture = TestBed.createComponent(LinkVisualComponent);
+        component = fixture.componentInstance;
+        fixture.detectChanges();
+    });
+
+    it('should create', () => {
+        expect(component).toBeTruthy();
+    });
+});