如何在角度测试http错误处理程序？

Question

下面是代码样本：

this.paymentTypesService.updatePaymentTypesOrder('cashout', newOrder).subscribe(() => { 
    this.notificationsService.success(
    'Success!', 
    `Order change saved successfully`, 
    { showProgressBar: true, pauseOnHover: true, clickToClose: true } 
); 
},() => { 
    this.notificationsService.error(
    'Error', 
    `Order change save failed`, 
    { showProgressBar: true, pauseOnHover: true, clickToClose: true } 
); 
}); 

还有就是paymentTypesService方法背后简单的HTTP服务......我应该怎样测试在这种情况下，错误处理程序？

Answer 1

这样的事情应该工作：

spyOn(paymentTypesService, 'updatePaymentTypesOrder').and.returnValue(Observable.throw(new Error()))