Function createTestPng

design/test/serve.test.ts:20–26

(filePath: string)

// Create a minimal 1x1 pixel PNG for test variants
function createTestPng(filePath: string): void {
  const png = Buffer.from(
    'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8/58BAwAI/AL+hc2rNAAAAABJRU5ErkJggg==',
    'base64'
  );
  fs.writeFileSync(filePath, png);
}

beforeAll(() => {
  tmpDir = '/tmp/serve-test-' + Date.now();