feat: core instruments

web/src/lib/core/test-helpers.ts

@@ -0,0 +1,14 @@
+import { expect } from 'vitest';
+import type { PixelImage } from './types';
+
+export function makeImage(width: number, height: number, pixels: number[][]): PixelImage {
+	const data = new Uint8ClampedArray(pixels.flat());
+	if (data.length !== width * height * 4) {
+		throw new Error(`Fixture mismatch: ${data.length} байт на ${width}x${height}`);
+	}
+	return { width, height, data };
+}
+
+export function expectImageEqual(actual: PixelImage, expectedPixels: number[][]): void {
+	expect([...actual.data]).toEqual(expectedPixels.flat());
+}