test(flow): cover workflow handlers and playback seams

[Vittuu]

Summary

• add hermetic coverage for download workflow routing, handler entrypoints, and playback smoke paths
• introduce small seam wrappers so workflow and playback logic can be tested without mpv, network, or interactive TUI dependencies
• keep the slice self-contained against dev by using local compatibility wrappers instead of depending on pending PRs

Why

This is the next flow-oriented slice after the API/source work. It covers the high-value routing paths that were still under-tested: download workflow dispatch, handler request plumbing, and playback orchestration before the mpv boundary.

Validation

• go test ./internal/download ./internal/handlers ./internal/playback -count=1
• go test ./internal/download ./internal/handlers ./internal/playback -cover -count=1
• go build ./cmd/goanime
• go run ./cmd/goanime --version

Notes

• Interactive playback selection tests stay opt-in by requiring GOANIME_INTERACTIVE_TESTS=1 and a real TTY.
• This remains draft while GitHub checks run.

[codacy-production]

Not up to standards ⛔

🔴 Issues 20 medium

Alerts:
⚠ 20 issues (≤ 0 issues of at least minor severity)

Results:
20 new issues

Category	Results
UnusedCode	20 medium

View in Codacy

🟢 Metrics -13 complexity · -11 duplication

Metric	Results
Complexity	-13
Duplication	-11

View in Codacy

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[deepsource-io]

DeepSource Code Review

We reviewed changes in 39317fe...3575f94 on this pull request. Below is the summary for the review, and you can see the individual issues we found as inline review comments.

See full review on DeepSource ↗

PR Report Card

Overall Grade

Security   Reliability   Complexity   Hygiene

Code Review Summary

Analyzer	Status	Updated (UTC)	Details
Go		May 2, 2026 2:12a.m.	Review ↗

---

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[codecov]

Codecov Report

❌ Patch coverage is 46.15385% with 56 lines in your changes missing coverage. Please review.
✅ Project coverage is 27.13%. Comparing base (d333714) to head (3575f94).
⚠️ Report is 21 commits behind head on dev.

Files with missing lines	Patch %	Lines
internal/playback/common.go	37.14%	21 Missing and 1 partial ⚠️
internal/download/workflow.go	56.75%	16 Missing ⚠️
internal/playback/movie.go	0.00%	7 Missing ⚠️
internal/handlers/media.go	0.00%	5 Missing ⚠️
internal/handlers/playback.go	0.00%	2 Missing ⚠️
internal/playback/series.go	81.81%	2 Missing ⚠️
internal/handlers/download.go	75.00%	0 Missing and 1 partial ⚠️
internal/handlers/update.go	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #173      +/-   ##
==========================================
+ Coverage   24.18%   27.13%   +2.94%     
==========================================
  Files          93       93              
  Lines       21097    21466     +369     
==========================================
+ Hits         5102     5824     +722     
+ Misses      15412    14993     -419     
- Partials      583      649      +66     

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