Add sample unit test

src/app/components/presentationals/main-toolbar/main-toolbar-desktop/main-toolbar-desktop.presentational.spec.ts

-import { async, ComponentFixture, TestBed } from "@angular/core/testing";
+import {async, ComponentFixture, TestBed} from "@angular/core/testing";
 
-import { MainToolbarDesktopPresentational } from "./main-toolbar-desktop.presentational";
+import {MainToolbarDesktopPresentational} from "./main-toolbar-desktop.presentational";
 
 describe("MainToolbarComponent", () => {
   let component: MainToolbarDesktopPresentational;
@@ -8,18 +8,14 @@ describe("MainToolbarComponent", () => {
 
   beforeEach(async(() => {
     TestBed.configureTestingModule({
-      declarations: [ MainToolbarDesktopPresentational ]
+      declarations: [MainToolbarDesktopPresentational],
     })
-    .compileComponents();
-  }));
-
-  beforeEach(() => {
+      .compileComponents();
     fixture = TestBed.createComponent(MainToolbarDesktopPresentational);
     component = fixture.componentInstance;
-    fixture.detectChanges();
-  });
+  }));
 
   it("should create", () => {
-    expect(component).toBeTruthy();
+    expect(() => fixture.detectChanges()).not.toThrow();
   });
 });