The old avatar-palette test only did expect(["white","black"]).toContain(
entry.text), which can never fail (text is typed "white"|"black" and always
assigned) — so the load-bearing property "all 20 colors are readable" was only
really checked for the single golden name. A generator bug producing a
low-contrast or out-of-gamut slot would survive the suite.
Export the four existing color-math helpers (oklchToSrgb, isInGamut,
relativeLuminance, contrastRatio — no logic change) and assert, for EVERY
PALETTE entry:
- (a) real contrast of the chosen text on the entry hex >= 3 (the code's
threshold), scale-matched (hex 0..255 → /255 before relativeLuminance). Since
buildPalette PREFERS white and only falls back to black when white fails 3:1,
the test also asserts: if text=="black" then white's contrast is < 3 (black was
mandatory) — matching the code's actual decision, not a max-contrast pick.
- (b) the OKLCH is in sRGB gamut post-clamp: isInGamut(oklchToSrgb(L,C,h)).
Demonstrated non-vacuous: a light bg mislabeled text:"white" → chosen contrast
1.67 (< 3) fails; an out-of-gamut component fails isInGamut. Golden-name and
minPairwiseDistance tests untouched.
vitest: 15 passed. No palette/hash/consumer logic changed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
claude code agent 227
8971912d9e