Cannot read properties of undefined (reading 'defaultPort') when used with nock

[TiddoLangerak]

SDK you're using (please complete the following information):

• Version 5.1.0

Describe the bug
When using Nock to mock requests to Xero then error responses result in a Cannot read properties of undefined (reading 'defaultPort') error triggered in the ApiError class.

This appears to be caused by xero-node using an undocumented http.ClientRequest.agent property to fetch the port, which doesn't exist when using Nock (and possibly other mocking frameworks, too).

To Reproduce

1. Setup a test using nock to generate some kind of error response. For example:

    nock(/xero/)
        .get(/Accounts/)
        .reply(429);
    client.accountingApi.getAccounts(/*...*/);
   

2. Observe that this triggers the above error, instead of throwing an ApiError

Expected behavior
I expect an ApiError to be thrown, instead of a cannot read properties of undefined

Screenshots

Additional context
http.ClientRequest.agent is an undocumented property, it's likely not intended as a public facing API. There's a documented alternative available to get the port: request.socket.localPort. So replacing

port: axiosError.request.agent.defaultPort,

with

port: axiosError.request.socket.localPort

should give the same information, using a documented public api, and compatible with Nock.

[github-actions]

PETOSS-396

[github-actions]

Thanks for raising an issue, a ticket has been created to track your request

[TiddoLangerak]

Have you had the chance to consider this issue? I'd be happy to submit a PR if you agree with the suggested change?

[QuentinLemCode]

Same issue here

[QuentinLemCode]

@TiddoLangerak The PR can maybe accelerate the fix :)

[QuentinLemCode]

@sangeet-joy-tw Can we have update on this please ?

[c4c1us]

Hey, @sangeet-joy-tw Could we have an update on this, please? Thanks in advance 🙏

[QuentinLemCode]

Hello @BenGDev @GraceYBR @JamesColemanXero @MattR-Api @MJMortimer @TheRegan
This issue blocks us to update the xero-node dependency. We rely on nock to test our business services using Xero API.

Can you review and approve this PR please ?
#682

[QuentinLemCode]

@manishT72 @manishT72x
Could you take a look at this issue and the PR linked, please ?