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test(e2e): fail the contrast probe on an unparseable colour

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paint() set fillStyle to black, then to the requested colour — but an
unparseable colour is a silent no-op on fillStyle, leaving black, which measures
as a spurious ~21:1 pass. Assign the colour against two different sentinels and
throw when it doesn't land on the same value, so a broken colour surfaces the
gate instead of clearing it.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Sergey Kozyrenko
2026-07-22 05:58:24 +07:00
co-authored by Claude Opus 4.8
parent cb0ec25319
commit abef4e29b8
1 changed files with 13 additions and 0 deletions
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frontend/e2e/helpers/contrast.ts
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@@ -100,8 +100,21 @@ export const measureContrast = async (page: Page, probe: string): Promise<number
context.clearRect(0, 0, 1, 1);
for (const layer of layers) {
// An unparseable colour is a silent no-op on fillStyle, leaving the previous
// value — which measures as a spurious ~21:1 pass. Assign it against two
// different sentinels: a colour that applied lands on the same value both
// times, an invalid one keeps whichever sentinel preceded it.
context.fillStyle = '#000000';
context.fillStyle = layer;
const fromBlack = context.fillStyle;
context.fillStyle = '#ffffff';
context.fillStyle = layer;
if (context.fillStyle !== fromBlack) {
throw new Error(`contrast: colour "${layer}" did not apply`);
}
context.fillRect(0, 0, 1, 1);
}