Simple assert equals, practical where a testing framework would be an overkill.

assert.ts

function isEquivalent<T>(received: T, expected: T) {
  return received && expected && typeof received === "object"
    ? isValueEquivalent(received, expected)
    : received === expected;
}
  
function isValueEquivalent(a: Record<string, any>, b: Record<string, any>) {
  const aPropertyNames = Object.getOwnPropertyNames(a);
  const bPropertyNames = Object.getOwnPropertyNames(b);

  if (aPropertyNames.length != bPropertyNames.length) return false;
  for (const propName of aPropertyNames) {
    if (!isEquivalent(a[propName], b[propName])) return false;
  }

  return true;
}

function assertEqual<T>(received: T, expected: T, id: string) {
  if (!isEquivalent(received, expected)) {
    throw new Error(`Expected ${JSON.stringify(expected)} but received ${JSON.stringify(received)} at ${id}.`);
  }
}