[Testing] fetchIncomingStreams endpoint-fallback loop and backend-to-frontend mapping are untested

[grantfox-oss]

Telegram (ask questions / claim the issue here first): https://t.me/+DOylgFv1jyJlNzM0

Why this matters

src/lib/api/streams.ts fetchIncomingStreams() powers the Incoming Streams page that feeds the withdraw flow: it iterates getStreamsEndpointCandidates(), skips on 404 to try the next candidate, accepts both array and {data:[]} payload shapes, and maps each via mapBackendStream (token-label resolution, toTokenAmount stroop scaling, status). With a mocked fetch this is fully testable, yet nothing covers the 404-then-succeed fallback or the status/scale mapping.

Acceptance criteria

• Mock global fetch; test it advances to the next endpoint on 404 and returns mapped results from the first 2xx
• Test both array and {data:[]} response shapes are handled
• Test mapBackendStream output: token label resolution + fallback, toTokenAmount scaling, and status
• Test it throws the last error when all candidates fail

Files to touch

• frontend/src/lib/api/streams.ts

Out of scope

• _shared.ts helpers already covered
• Live backend integration

[OluRemiFour]

I've reviewed the task and have a clear implementation plan. Looking forward to contributing with a quality PR.

[MorsH14]

@MorsH14 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Id love to work on this issue

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[heymide]

@heymide has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Interested in working on this issue. I'll implement the requested changes and ensure everything is properly tested before submission.

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[tecmalik]

@tecmalik has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi

Please assign me this task. I’ll add comprehensive tests for fetchIncomingStreams() covering endpoint fallback, response shape handling, backend-to-frontend mapping, and failure scenarios with mocked fetch.

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[DevScoopee]

@DevScoopee has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi, I fully understood what is to be implemented and can deliver. Kindly assign

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[david87131]

@david87131 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Interested in working on this issue. I'll implement the requested changes and ensure everything is properly tested before submission.

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Congratulations, @david87131! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

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[Nursca]

@Nursca has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello I would like to work on this issue

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[Kenlachy]

@Kenlachy has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I will like to work on this issue.

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