rusackas opened a new pull request, #40821:
URL: https://github.com/apache/superset/pull/40821
### SUMMARY
This is a **test-only PR** opened as a TDD-style validation of issue #28766.
#28766 reports that a Gauge chart configured with interval bounds and
interval colors (mapped to a categorical color scheme) **sometimes renders the
wrong interval colors** when first loaded on a dashboard — refreshing the page
fixes it.
The gauge renders to a `<canvas>`, so this Playwright spec reads the
rendered pixels back and asserts the configured color-scheme mapping is
honored. With `color_scheme: supersetColors` and `interval_color_indices:
'1,2'`, the gauge axis must paint the scheme's 1st (`#1FA8C9`) and 2nd
(`#454E7C`) colors and must **not** paint the 3rd (`#5AC189`) — painting a
shifted/fallback palette is exactly the reported symptom.
1. **`Gauge renders configured interval colors on a dashboard (#28766)`** —
loads the gauge on a dashboard and asserts the interval colors from the
configured palette indices are present (and the unused index is absent).
**Status:** on current `master` the gauge paints the configured colors on
first load in this scenario (the test passes), so it validates the mapping and
locks in a regression guard. Because the original report is intermittent
("sometimes"), this deterministic pixel check is intentionally non-flaky: it
asserts the *correct* mapping rather than trying to provoke the race, so it
fails reliably if a regression shifts the palette.
### How to interpret CI
- **CI green** → the gauge paints the configured interval colors; merging
closes #28766 and guards against regressions.
- **CI red** → the interval colors are wrong; the bug is live in
`superset-frontend/plugins/plugin-chart-echarts/src/Gauge` (color-scheme
resolution / interval-color mapping).
### TESTING INSTRUCTIONS
```bash
cd superset-frontend
npx playwright test playwright/tests/dashboard/gauge-interval-colors.spec.ts
```
### ADDITIONAL INFORMATION
- [x] Has associated issue: closes #28766
- [ ] Required feature flags:
- [ ] Changes UI
- [ ] Includes DB Migration
- [ ] Introduces new feature or API
- [ ] Removes existing feature or API
🤖 Generated with [Claude Code](https://claude.com/claude-code)
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