Function assertEq

scripts/decorator-tests.js:5326–5343

(callback, expected)

  }
}
function assertEq(callback, expected) {
  let details;
  try {
    let x = callback();
    if (x === expected) return true;
    details = `  Expected: ${prettyPrint(expected)}
  Observed: ${prettyPrint(x)}`;
  } catch (error) {
    details = `  Throws: ${error}`;
  }
  const code = callback.toString().replace(/^\(\) => /, "").replace(/\s+/g, " ");
  console.log(`\u274C ${testName}
  Code: ${code}
${details}
`);
  failures++;
  return false;
}
function assertThrows(callback, expected) {
  let details;
  try {