test: add unit tests for payment callback controllers

[phoenix-server]

Summary

All four payment callback controllers are at ~15–22% statement coverage with 0% branch coverage — none of the conditional logic is exercised.

Files to cover

• src/controllers/callbacks/lnbits-callback-controller.ts (15%)
• src/controllers/callbacks/nodeless-callback-controller.ts (20%)
• src/controllers/callbacks/opennode-callback-controller.ts (22%)
• src/controllers/callbacks/zebedee-callback-controller.ts (19%)

Out of scope

• src/controllers/invoices/ — already well covered
• src/controllers/admission/ — separate concern
• Factory files under src/factories/controllers/
• src/payments-processors/ — see test: add unit tests for payment processors #487

Acceptance criteria

• Each controller has a corresponding .spec.ts under test/unit/controllers/callbacks/
• Valid and invalid payload cases covered per provider
• Authentication/signature verification branches covered
• Dependencies (payment processors, repositories) stubbed
• npm run cover:unit passes without regressions

[Anshumancanrock]

hii @phoenix-server , I would love to work on this.

[phoenix-server]

Hi @Anshumancanrock! Thanks for your interest. You currently have 3 open assigned issues (#453, #407, #405) plus an open PR (#451). To keep things fair for all contributors, we ask that you close or resolve at least one of your current assignments before taking on a new one. Feel free to come back and claim this once you're done — it'll still be here!

[Anshumancanrock]

@phoenix-server I don’t have any issues left to work on other than the blocked issue.

[Anshumancanrock]

sure ! I will wait :)

[abhinavrathee]

@phoenix-server so can i work on this

[phoenix-server]

Thanks @abhinavrathee! This one is already assigned to @Anshumancanrock. Feel free to check the other open issues labeled test — #488 (WebSocket/Redis adapters) is still available!

[cameri]

thanks @Anshumancanrock !