ML-182.6: wave 6 conversion

backlog/tasks/ml-182.6 - Wave-6-Chat-component-streaming-tests-send_update-3-blocker.md

@@ -0,0 +1,34 @@
+---
+id: ML-182.6
+title: "Wave 6: Chat component streaming tests (send_update/3 blocker)"
+status: To Do
+assignee: []
+created_date: "2026-05-14 22:15"
+labels:
+  - testing
+  - refactoring
+dependencies: []
+modified_files:
+  - test/music_library_web/components/chat_test.exs
+parent_task_id: ML-182
+priority: medium
+ordinal: 16000
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+
+The hardest file — `components/chat_test.exs` uses `Phoenix.LiveView.send_update(view.pid, Chat, [chunk: ..., done: ..., error: ...])` to drive the Chat component's internal `update/2` callback directly with streaming state tuples. This is unit-level LiveComponent testing with no PhoenixTest equivalent — PhoenixTest has no concept of LiveComponent PIDs.
+
+3 tests affected in "update/2 streaming state transitions" describe block:
+
+- "chunk clause appends to the streaming doc"
+- "done clause finalizes the assistant message and clears loading"
+- "error clause surfaces the error and a retry button"
+
+Workaround: Rewrite as integration tests through the actual SSE streaming pipeline (stub OpenAI.API to emit controlled SSE events, use `visit/2` + `assert_has/3`).
+
+Effort: High (4-6h). Requires understanding the SSE streaming protocol and Chat component internals.
+
+<!-- SECTION:DESCRIPTION:END -->