diff --git a/modules/data-access/product/src/lib/state/cart/cart.service.spec.ts b/modules/data-access/product/src/lib/state/cart/cart.service.spec.ts
new file mode 100644
index 0000000..cb4a750
--- /dev/null
+++ b/modules/data-access/product/src/lib/state/cart/cart.service.spec.ts
@@ -0,0 +1,16 @@
+import { TestBed } from '@angular/core/testing';
+
+import { CartService } from './cart.service';
+
+describe('CartService', () => {
+  let service: CartService;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({});
+    service = TestBed.inject(CartService);
+  });
+
+  it('should be created', () => {
+    expect(service).toBeTruthy();
+  });
+});
diff --git a/modules/data-access/product/src/lib/state/cart/cart.service.ts b/modules/data-access/product/src/lib/state/cart/cart.service.ts
new file mode 100644
index 0000000..55d7aa4
--- /dev/null
+++ b/modules/data-access/product/src/lib/state/cart/cart.service.ts
@@ -0,0 +1,8 @@
+import { Injectable } from '@angular/core';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class CartService {
+  constructor() {}
+}
diff --git a/src/app/interceptors/http-errors/http-errors.interceptor.spec.ts b/src/app/interceptors/http-errors/http-errors.interceptor.spec.ts
index 94d469a..14ce270 100644
--- a/src/app/interceptors/http-errors/http-errors.interceptor.spec.ts
+++ b/src/app/interceptors/http-errors/http-errors.interceptor.spec.ts
@@ -1,13 +1,35 @@
 import { TestBed } from '@angular/core/testing';
 
 import { HttpErrorsInterceptor } from './http-errors.interceptor';
+import { HTTP_INTERCEPTORS, HttpClient } from '@angular/common/http';
+import { MatSnackBar, MatSnackBarModule } from '@angular/material/snack-bar';
+import {
+  HttpClientTestingModule,
+  HttpTestingController,
+} from '@angular/common/http/testing';
 
 describe('HttpErrorsInterceptor', () => {
-  beforeEach(() =>
+  let httpClient: HttpClient;
+  let httpMock: HttpTestingController;
+  let matSnackBar: MatSnackBar;
+
+  beforeEach(() => {
     TestBed.configureTestingModule({
-      providers: [HttpErrorsInterceptor],
-    })
-  );
+      imports: [HttpClientTestingModule, MatSnackBarModule],
+      providers: [
+        HttpErrorsInterceptor,
+        {
+          provide: HTTP_INTERCEPTORS,
+          useClass: HttpErrorsInterceptor,
+          multi: true,
+        },
+      ],
+    });
+
+    httpClient = TestBed.inject(HttpClient);
+    httpMock = TestBed.inject(HttpTestingController);
+    matSnackBar = TestBed.inject(MatSnackBar);
+  });
 
   it('should be created', () => {
     const interceptor: HttpErrorsInterceptor = TestBed.inject(
@@ -15,4 +37,15 @@ describe('HttpErrorsInterceptor', () => {
     );
     expect(interceptor).toBeTruthy();
   });
+
+  it('should open notification on http error', () => {
+    jest.spyOn(matSnackBar, 'open');
+    httpClient.get('/test').subscribe();
+
+    const request = httpMock.expectOne('/test');
+    request.error(new ProgressEvent('error'));
+
+    expect(matSnackBar.open).toHaveBeenCalled();
+    expect(request.request.headers.has('x-access-token')).toBe(true);
+  });
 });