TypeError: Cannot read property 'length' of undefined AngularJS Karma

Question

我有点卡在单元测试中，对于函数hasAddress()但是好像不行，我想我没有关于如何使用 Karma 进行 angularjs 单元测试的想法，但我不知道如何解决这部分，我不确定我错在哪里，有人可以帮助我吗？？

错误是：

HeadlessChrome 0.0.0 (Mac OS X 10.12.6) directionFormulation component should load customer customerData FAILED
        TypeError: Cannot read property 'lexngth' of undefined
            at hasAddresses (app/Resources/assets/workplace/js/directionFormulation.js:9:4128)
            at directionFormulationController.onInit [as $onInit] (app/Resources/assets/workplace/js/directionFormulation.js:9:2344)
            at Context.<anonymous> (app/Resources/assets/workplace/js/test/specs/directionFormulation.spec.js:241:15)
HeadlessChrome 0.0.0 (Mac OS X 10.12.6) directionFormulation component should be checking if has addresses FAILED
        TypeError: Cannot read property 'length' of undefined
            at directionFormulationController.hasAddresses (app/Resources/assets/workplace/js/directionFormulation.js:9:4128)
            at Context.<anonymous> (app/Resources/assets/workplace/js/test/specs/directionFormulation.spec.js:261:22)

directionFormulation.js

    function customerData() {
      return customer.loadCustomerData().then(function (customerData) {
        this.customerDataCustomer = customerData;

        this.input.firstName = this.customerDataCustomer.firstName;
        this.input.lastName = this.customerDataCustomer.lastName;
        this.input.phoneNumber = this.customerDataCustomer.phoneNumber;
      });
    }

单元测试directionFormulation.spec.js

 it('should load customer customerData', function () {
    component.$onInit();
    component.customerData();
    // component.loadCustomerData().then(function () {
    //   expect(component.input.firstName).to.be.equal(customer.customerData.firstName);
    //   expect(component.input.lastName).to.be.equal(customer.customerData.lastName);
    //   expect(component.input.phoneNumber).to.be.equal(customer.customerData.phoneNumber);
    // });
    sinon.stub(customer, 'loadCustomerData').returns($q.when({firstName: 'John', lastName: 'Smith', phoneNumber:'55551234'}));
    component.loadRegions().then(function () {
      expect(customer.customerData.firstName).to.exist;
      expect(customer.customerData.lastName).to.exist;
      expect(customer.customerData.phoneNumber).to.exist;
      expect(customer.customerData.firstName).to.be.equals('John');
      expect(customer.customerData.lastName).to.be.equals('Smith');
      expect(customer.customerData.phoneNumber).to.be.equals('55551234');
    });
  });
});

Answer 1

您有几个问题：

您的客户对象还没有地址：

customer = {
  profile: {
    firstName: 'John',
    lastName: 'Smith',
    phoneNumber: '55551234',
  },
  // no addresses!
};

所以当您调用 hasAddresses():

时，(customer.addresses).length 在第一个 expect 中失败

expect(component.hasAddresses()).to.be.false;

也许您的 hasAddresses 函数应该如下所示：

function hasAddresses() {
  return customer.addresses && customer.addresses.length;
}

在此之后 expect 你应该仍然有问题，因为你将地址创建为一个对象：

customer.addresses = { 1: { id: 1 } };

应该是一个数组：

customer.addresses = [{ id: 1 }];

TypeError: Cannot read property 'length' of undefined AngularJS Karma

TypeError: Cannot read property 'length' of undefined AngularJS Karma

unit-testing

angularjs

gulp-karma

karma-mocha