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d78c630d36
Adds targeted behavioral tests for the slimmed `useBrushDrawing`
orchestration composable (Phase E of the brush-drawing refactor).
## Changes
- 5 new tests covering previously untested branches:
- `compositeStroke` receives `isRgb=true` when active layer is `rgb`
- `compositeStroke` receives `isErasing=true` when tool is `eraser`
- Mask canvas opacity is restored after drawing on the mask layer
- `globalCompositeOperation` is set to `destination-out` during
`handleDrawing` when tool is eraser
- `globalCompositeOperation` is set to `destination-out` during
`handleDrawing` when right mouse button is held
## Coverage (useBrushDrawing.ts)
| Metric | Before | After |
|--------|--------|-------|
| Statements | 86.33% | 87.05% |
| Branches | 68.75% | 70.00% |
| Functions | 90.00% | 90.00% |
| Lines | 89.23% | 90.00% |
All 18 tests pass. GPU paths remain `/* c8 ignore */` excluded
(untestable without WebGL).
- Fixes #0
<!-- CURSOR_SUMMARY -->
---
> [!NOTE]
> **Low Risk**
> Low risk: changes are limited to unit tests, adding coverage for
eraser/right-click composition and `drawEnd` GPU compositing/opacity
restoration paths without altering production logic.
>
> **Overview**
> Adds new `useBrushDrawing` test cases to cover previously untested
branches: setting `globalCompositeOperation` to `destination-out` during
`handleDrawing` when erasing (tool or right-click), and verifying
`drawEnd` passes correct `isRgb`/`isErasing` flags to
`gpu.compositeStroke`.
>
> Also asserts mask-layer opacity is restored after `drawEnd`,
increasing behavioral coverage around stroke completion and canvas
visibility cleanup.
>
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
20c411e6ce. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-12001-test-maskeditor-expand-useBrushDrawing-behavioral-coverage-3586d73d365081388ebcef91c2172c0a)
by [Unito](https://www.unito.io)