javascript - Jasmine:返回 promise 的测试是一个具体的异常

Question

我的 node.js 服务器中有一个方法，它返回一个 Promise - 抛出一个自定义异常 (UserNotAuthenticatedError) - 我想编写一个测试来进行确保在必要时抛出此异常。

方法如下:

export function changePassword(userId, oldPass, newPass) {
  var query = User.findById(userId);
  return query.exec()
    .then(user => {
      if (user.authenticate(oldPass)) {
        user.password = newPass;
        return user.save();
      } else {
        // I want to test that this Exception is thrown
        throw new UserNotAuthenticatedError();
      }
    });
}

我已经尝试编写测试，这是我目前所拥有的:

describe('#changePassword', function() {
    it('should throw a UserNotAuthenticatedError when passing wrong password', function() {
      var userId = user._id;
      var wrongPwd = 'wrongpassword';
      var newPwd = 'new password';
      // so far the following only tells me that the Promise was rejected, but
      // I WANT TO TEST THAT THE REJECTION WAS DUE TO A 'UserNotAuthenticatedError'
      UserService.changePassword(userId, wrongPwd, newPwd).should.be.rejected;
    });
  });

我已经完成检查返回的 promise 是否被拒绝，但我还想更具体地检查返回的 promise 是否为 UserNotAuthenticatedError。我怎么能那样做？

Answer 1

我终于找到了一个更好的方法来解决它:

it('should throw a UserNotAuthenticatedError when passing wrong password', function() {
  var userId = user._id;
  var wrongPwd = 'wrongpassword';
  var newPwd = 'new password';

  var promise = UserService.changePassword(userId, wrongPwd, newPwd);
  return promise.should.be.rejectedWith(UserNotAuthenticatedError);
});