Initial commit

tests/Unit/Picture/PaletteTest.php

@@ -0,0 +1,16 @@
+<?php
+
+use Doom\Picture\Palette;
+
+test('creates palette from bytes and roundtrips', function (): void {
+    $bytes = str_repeat("\x01\x02\x03", 256);
+    $palette = Palette::fromBytes($bytes);
+
+    expect($palette->colorAt(0))->toBe([1, 2, 3]);
+    expect($palette->colorAt(255))->toBe([1, 2, 3]);
+    expect($palette->toBytes())->toBe($bytes);
+});
+
+test('rejects invalid palette byte length', function (): void {
+    expect(fn () => Palette::fromBytes("\x00"))->toThrow(InvalidArgumentException::class);
+});