---
id: PLN-0091
ticket: variable-tile-bank-palette-serialization
title: Variable Glyph Palette Tests, Fixtures, and Final Validation
status: done
created: 2026-07-14
completed: 2026-07-14
ref_decisions:
  - DEC-0038
tags:
  - tests
  - fixtures
  - validation
  - glyph-bank
  - palette-serialization
---

## Objective

Update tests and fixtures to prove Studio/packer emit runtime-conforming
variable glyph palette payloads and contain no stale fixed-padding assumptions.

## Background

`DEC-0038` requires downstream fixture coverage for `palette_count = 1`, an
intermediate count, and `palette_count = 64`, plus producer validation for
metadata/payload mismatch. Earlier tests still assert `palette_count = 64`,
4096-byte palette blocks, and fixed glyph payload sizes.

## Scope

### Included

- Update packer unit tests and integration-style workspace tests.
- Update packer fixture `asset.json` files and expected runtime payload checks.
- Update Studio tests only where Studio projections or UI logic expose
  effective palette count.
- Run focused and broad validation.

### Excluded

- Runtime repository tests.
- New feature design.
- Palette remapping behavior.

## Execution Steps

### Step 1 - Update packer parser and metadata tests

**What:** Prove effective `palette_count` validation.

**How:** Add tests for `palette_count = 1`, intermediate counts, `64`,
duplicate/sparse direct identity behavior, and rejection above `64`.

**File(s):**

- `prometeu-packer/prometeu-packer-v1/src/test/java/p/packer/services/PackerAssetDeclarationParserTest.java`
- `prometeu-packer/prometeu-packer-v1/src/test/java/p/packer/repositories/PackerGlyphBankWalkerTest.java`

### Step 2 - Update payload and asset table tests

**What:** Prove variable payload lengths and size formulas.

**How:** Replace fixed 4096-byte expectations with
`palette_count * 16 * 4`. Assert `size`, `decoded_size`, payload offsets, and
RGBA bytes for several counts.

**File(s):**

- `prometeu-packer/prometeu-packer-v1/src/test/java/p/packer/services/FileSystemPackerWorkspaceServiceTest.java`
- `prometeu-packer/prometeu-packer-v1/src/test/java/p/packer/repositories/PackerRuntimeAssetMaterializerTest.java`
- `prometeu-packer/prometeu-packer-v1/src/test/java/p/packer/services/PackerRuntimePatchServiceTest.java`
- `prometeu-packer/prometeu-packer-v1/src/test/java/p/packer/services/PackerRuntimeRegistryTest.java`

### Step 3 - Update fixtures

**What:** Replace stale fixed-padding fixtures.

**How:** Regenerate or edit packer test fixtures so at least one glyph bank uses
`palette_count = 1`, one uses an intermediate count, and one uses `64`.
Fixtures with fixed 64 padding are valid only when metadata says
`palette_count = 64`.

**File(s):**

- `prometeu-packer/prometeu-packer-v1/src/test/resources/fixtures/**/asset.json`
- Related binary or generated expected payload fixtures under packer test
  resources.

### Step 4 - Update Studio tests

**What:** Cover Studio-facing projection changes.

**How:** Adjust tests only where Studio surfaces effective palette counts or
metadata. Keep color rendering assertions focused on `rgba8888`.

**File(s):**

- `prometeu-studio/src/test/java/p/studio/workspaces/assets/details/**`

### Step 5 - Run validation and residue scans

**What:** Prove no normal-path fixed-padding residue remains.

**How:** Run relevant Gradle tests and search normal specs/code/tests/fixtures
for stale `palette_count = 64`, `4096`, fixed `64 * 16 * 4`, `GLYPH/indexed_v2`,
and sparse remapping language. Classify any remaining match as historical,
max-bound, or a bug.

**File(s):**

- `docs/specs/packer/**`
- `docs/specs/studio/**`
- `prometeu-packer/**`
- `prometeu-studio/**`

## Test Requirements

### Unit Tests

- Packer parser, walker, materializer, details/read, and workspace service tests
  pass.
- Studio asset details tests pass where touched.

### Integration Tests

- Packer workspace build/materialization tests pass.
- Repository build or narrow Studio/packer build validation passes.

### Manual Verification

- Residue scan finds no normal-path fixed-padding contract text or code.
- `discussion validate` passes.

## Acceptance Criteria

- [x] Tests cover `palette_count = 1`, an intermediate count, and `64`.
- [x] Tests cover variable `size` and `decoded_size`.
- [x] Tests cover emitted palette byte length and RGBA order.
- [x] Tests cover metadata/payload mismatch rejection or producer validation.
- [x] Fixtures no longer rely on fixed 64-palette padding unless count is `64`.
- [x] Validation commands pass.
- [x] Residue scan results are clean or explicitly classified.

## Execution Notes

- Added packer workspace coverage for `palette_count = 1` and intermediate
  `palette_count = 7`.
- Existing fixture and build paths continue to cover `palette_count = 64` where
  a max-count payload is intended.
- Added parser coverage rejecting palette declaration index `64`, preserving
  the v1 maximum effective count of `64` through direct ids `0..63`.
- `:prometeu-packer:prometeu-packer-v1:test` passed.
- `./gradlew build` passed.
- Residue scan found only intentional normative statements rejecting
  `convertedRgb565`, `GLYPH/indexed_v2`, fixed-padding compatibility, and
  sparse-to-dense remapping.

## Dependencies

- Depends on `PLN-0087`, `PLN-0088`, `PLN-0089`, and `PLN-0090`.

## Risks

- Generated project fixtures may require regeneration rather than manual edits.
- Broad residue scans may include historical discussions; scope final checks to
  active specs, code, tests, and fixtures.