---
id: SLICE-0003
type: slice
status: done
parent: NS-0001
title: Protect keyed collection regressions with generated-resource assertions
refs:
  - REQUIREMENTS.md
  - examples/html_examples/src/main.rs
  - hemx-test/src/lib.rs
---

## Objective

Make keyed list regressions easy to catch without raw selector or raw effect coupling: tests should assert generated resource behavior for remove, replace, and append paths.

## Authority

`REQUIREMENTS.md` `list/006`, `test/008`, `test/009`, `test/010`, and `test/017` constrain keyed collection behavior and test diagnostics.

## Close when

- Filtered keyed collections are tested for removing filtered-out keys, replacing retained keys, and appending newly visible keys.
- Assertions use generated resource helpers or `hemx_test` inspection adapters, not raw runtime ids as app-facing API.
- Failure messages name generated resources where practical.

## Verification

- `cargo test -p hemx-html-examples`
- `cargo test -p hemx-test --test inspector`
- `cargo run -p hemx-xtask -- html-examples-smoke`

## Non-goals

- Do not add app authoring APIs for selectors or raw runtime ids.
- Do not test private runtime payload layout unless the slice changes wire semantics.

## Evidence

Done at HEAD `2122b3c`: `cargo test -p hemx-html-examples` covers active-search keyed remove/replace/append behavior through generated `gallery::search_result` assertions, `cargo test -p hemx-test --test inspector` covers rendered target/handle helper diagnostics with generated names, and `cargo run -p hemx-xtask -- html-examples-smoke` covers the browser active-search path. No app-facing selector/raw-id API was added.