Try to test http service

src/app/shared/services/appliance.service.spec.ts

@@ -1,15 +1,50 @@
-import { TestBed, inject } from '@angular/core/testing';
+import { TestBed, inject, async } from '@angular/core/testing';
+import { HttpClientModule} from '@angular/common/http';
+import { HttpClientTestingModule, HttpTestingController } from '@angular/common/http/testing';
 
 import { ApplianceService } from './appliance.service';
+import { Server } from '../models/server';
+import { HttpServer } from './http-server.service';
+import { Http, HttpModule, XHRBackend} from '@angular/http';
+import { MockBackend, MockConnection } from '@angular/http/testing';
 
 describe('ApplianceService', () => {
-  beforeEach(() => {
+  beforeEach(async(() => {
     TestBed.configureTestingModule({
-      providers: [ApplianceService]
+      imports: [
+        HttpModule,
+      ],
+      providers: [
+        ApplianceService,
+        HttpServer,
+        MockBackend,
+        { provide: XHRBackend, useExisting: MockBackend }
+      ]
     });
-  });
+  }));
 
-  // it('should be created', inject([ApplianceService], (service: ApplianceService) => {
+  it('should be created', 
-  //   expect(service).toBeTruthy();
+    inject([ApplianceService, Http, MockBackend], 
-  // }));
+      (service: ApplianceService, client: Http, backend: MockBackend) => {
+
+    expect(service).toBeTruthy();
+  }));
+
+  it('should ask for the list from server', 
+    async(inject([ApplianceService, Http, MockBackend], 
+      (service: ApplianceService, client: Http, backend: MockBackend) => {
+    
+    const server = new Server();
+    server.ip = "127.0.0.1";
+    server.port = 3080;
+    server.authorization = "none";
+
+    service.list(server).subscribe();
+
+    backend.connections.subscribe((c: MockConnection) => {
+      expect(c.request.url).toBe('test');
+    });
+
+    expect(backend.verifyNoPendingRequests).toBeTruthy();
+  })));
 });