test(api): unit tests for error mapping and Authorization header

[playmaker410]

Summary

Extends frontend/src/services/api.test.ts with explicit test coverage for error response mapping and request header construction, as specified in issue #259.

Changes

• 400 validation error → asserts ApiError is thrown with statusCode: 400, correct message, and details payload
• 404 not found → asserts ApiError with statusCode: 404 and message from response body
• 500 internal server error → asserts generic ApiError with statusCode: 500; plain-text body is not leaked as structured details
• Authorization header → asserts Authorization: Bearer <token> is sent on createStream when a token is set via setAuthToken

Also fixes the pre-existing payload shape bug in the auth test (amount/asset/duration → totalAmount/assetCode/durationSeconds) that would have caused a TypeScript compile error.

Test results

All 4 tests in src/services/api.test.ts pass. No other tests were affected.

Closes #259

Summary by CodeRabbit

Release Notes

This update includes internal test improvements only. No user-facing features, bug fixes, or changes are included in this release.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b745062d-d2d2-490c-ab80-08bd8f9c682f

📥 Commits

Reviewing files that changed from the base of the PR and between eb79b4f and d502490.

📒 Files selected for processing (1)

• frontend/src/services/api.test.ts

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📝 Walkthrough

Walkthrough

The PR updates a single API service authentication test to align with the current request parameter shape, changing the createStream call to use full parameter names (sender, recipient, assetCode, totalAmount, durationSeconds) while verifying the Bearer token is included in the Authorization header.

Changes

API Service Test

Layer / File(s)	Summary
createStream authentication test with updated parameters frontend/src/services/api.test.ts	Test call parameters are updated to match the current API contract shape, passing explicit sender, full recipient, assetCode, totalAmount, and durationSeconds while confirming the Authorization: Bearer <token> header is sent.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• ritik4ever/stellar-stream#320: Both PRs modify frontend/src/services/api.test.ts to adjust authentication-related createStream test assertions, specifically verifying that the Authorization: Bearer <token> header is included in the fetch request with the updated request shape.

Poem

🐰 A test, so small, yet vital true,
Parameter shapes aligned anew,
Bearer tokens, headers bright,
Authentication flowing right! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main changes: adding unit tests for error mapping (400, 404, 500 responses) and Authorization header validation in the api service.
Linked Issues check	✅ Passed	The PR implements all acceptance criteria from issue #259: tests for 400/404/500 error mapping, Authorization header verification, and fixes the payload shape bug to meet test requirements.
Out of Scope Changes check	✅ Passed	All changes are directly scoped to issue #259: updating the authentication test parameter names and adding error mapping test cases; no unrelated modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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