name	e2e-regression-async-generators
description	End-to-end regression tests for async generator copy logic
triggers	["async generator","copy logic","done chunk","RAGEngine.query","regression test","integration bug","unit test gap"]
generated_from_knowledge	["2274327e-4f6f-4a2f-b3eb-f1c915b14af2"]
source_knowledge_ids	["2274327e-4f6f-4a2f-b3eb-f1c915b14af2","584bad6d-c7ee-4486-8ad4-3c4ef319e5ff"]
generated_at	"2026-07-06T17:07:25.088Z"
confidence	0.7
status	active
version	2
skill_origin	generated

End-to-end regression tests for async generator copy logic

Trigger

When a code change touches copy logic inside an async generator path, prefer end-to-end tests that consume the full generator and assert specific values, not unit tests of private methods that hand-simulate the copy.

Triggers

async generator
copy logic
done chunk
RAGEngine.query
regression test
integration bug
unit test gap

Required Procedure

Drive the real production async generator path end-to-end (e.g., engine.query(...)).
Consume the full async generator output; do not short-circuit after the first yield.
Assert specific values on the emitted payload, not just key presence.
For copy logic, verify the copied value matches the source value resolved by the production path.
Ensure the regression test fails when the production copy logic is removed or broken.

Example

Canonical pattern: backend/tests/test_prompt_ab_variants.py::TestDoneMsgABKeysE2E

Forbidden Shortcuts

Do not hand-simulate the copy step in a test of a private helper and assert the same assignment.
Do not assert only key presence when value correctness is the actual contract.
Do not stop consuming the generator early unless the test explicitly targets an early-stage behavior.

Delegation Template

When delegating a task affected by this skill, include:

SKILLS: file:.opencode/skills/generated/e2e-regression-async-generators/SKILL.md

Reviewer Checks

Verify each required action above appears in the diff.

Source Knowledge IDs

2274327e-4f6f-4a2f-b3eb-f1c915b14af2 — End-to-end tests that consume the full async generator catch integration bugs that unit tests of private methods miss.
584bad6d-c7ee-4486-8ad4-3c4ef319e5ff — Copy logic inside async generator paths must be verified end-to-end, not by unit-testing a private helper in isolation.

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End-to-end regression tests for async generator copy logic

Trigger

Triggers

async generator

copy logic

done chunk

RAGEngine.query

regression test

integration bug

unit test gap

Required Procedure

Drive the real production async generator path end-to-end (e.g., engine.query(...)).

Consume the full async generator output; do not short-circuit after the first yield.

Assert specific values on the emitted payload, not just key presence.

For copy logic, verify the copied value matches the source value resolved by the production path.

Ensure the regression test fails when the production copy logic is removed or broken.

Example

Canonical pattern: backend/tests/test_prompt_ab_variants.py::TestDoneMsgABKeysE2E

Forbidden Shortcuts

Do not hand-simulate the copy step in a test of a private helper and assert the same assignment.

Do not assert only key presence when value correctness is the actual contract.

Do not stop consuming the generator early unless the test explicitly targets an early-stage behavior.

Delegation Template

When delegating a task affected by this skill, include:

SKILLS: file:.opencode/skills/generated/e2e-regression-async-generators/SKILL.md

Reviewer Checks

Verify each required action above appears in the diff.

Source Knowledge IDs

2274327e-4f6f-4a2f-b3eb-f1c915b14af2 — End-to-end tests that consume the full async generator catch integration bugs that unit tests of private methods miss.

584bad6d-c7ee-4486-8ad4-3c4ef319e5ff — Copy logic inside async generator paths must be verified end-to-end, not by unit-testing a private helper in isolation.