test(examples-chat): kill aimock-e2e flake (chunkSize + data-streaming wait)#327
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…flake Aggressive default chunking sometimes splits a triple-backtick mid-token, producing inline <code> rendering instead of <pre><code>. The harness tests measure FINAL rendered structure (streaming-progressive behavior is covered by the Phase 1 unit-variance tables), so single-chunk replay is the right tradeoff. Comment in the runner documents the choice.
…streaming=false Asserting on intermediate streaming-state DOM is the other source of e2e flake. The chat composition flips chat-message[data-streaming] to 'false' when the agent's isLoading() goes false; helper waits on that DOM contract before returning the finalized bubble. Smoke, markdown, and A2UI specs all route through the helper now.
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…g wait) (#327) * test(examples-chat): set aimock chunkSize=4096 to defeat fence-split flake Aggressive default chunking sometimes splits a triple-backtick mid-token, producing inline <code> rendering instead of <pre><code>. The harness tests measure FINAL rendered structure (streaming-progressive behavior is covered by the Phase 1 unit-variance tables), so single-chunk replay is the right tradeoff. Comment in the runner documents the choice. * test(examples-chat): extract sendPromptAndWait helper, wait for data-streaming=false Asserting on intermediate streaming-state DOM is the other source of e2e flake. The chat composition flips chat-message[data-streaming] to 'false' when the agent's isLoading() goes false; helper waits on that DOM contract before returning the finalized bubble. Smoke, markdown, and A2UI specs all route through the helper now.
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Summary
Two-part fix for the recurring e2e flake noted in #314 and #322.
What caused the flake
<code>instead of<pre><code>. Showed up as the "code fence" spec failing.<li>immediately after seeing assistant text, sometimes catching a transient 1-or-2-item state during streaming. Showed up as the "bullet list" spec failing.Fix
chunkSize: 4096on the runner so each response arrives in 1–2 SSE deltas. Streaming-progressive behavior is already covered by Phase 1's unit-variance tables (#305); the e2e harness tests final-state invariants and cross-stack integration, not the streaming partial-render path.sendPromptAndWaithelper intest-helpers.tsthat waits onchat-message[data-role="assistant"][data-streaming="false"]before returning the finalized bubble. The chat composition already exposes this DOM contract — wiring[streaming]="agent.isLoading() && i === lastIndex"tochat-message's host attribute — but the specs weren't using it. Smoke, markdown, and A2UI specs now route through the helper.Verification
Ran the full Playwright suite 5 times consecutively locally: 5/5 clean (no flakes). Before this PR, runs failed 2/5 to 3/5 on either the code-fence or the bullet-list spec. Runner unit tests still pass (3/3).
Note on the streaming-DOM contract
While investigating I confirmed the
data-streamingattribute on<chat-message>already exists at libs/chat/src/lib/primitives/chat-message/chat-message.component.ts:28. No@ngaf/chatchange was needed — this was a test-side bug, not a library feature gap.Test plan