1import ExpoRandom from '../ExpoRandom';
2import * as Random from '../Random';
3
4jest.mock('../ExpoRandom', () => ({
5  getRandomBytesAsync: jest.fn(async () => 0),
6  getRandomBase64StringAsync: jest.fn(async () => 0),
7}));
8
9jest.mock('base64-js', () => ({ toByteArray: jest.fn(() => {}) }));
10
11it(`accepts valid byte counts`, async () => {
12  for (const value of [0, 1024, 512.5]) {
13    await expect(Random.getRandomBytesAsync(value));
14    expect(ExpoRandom.getRandomBytesAsync).lastCalledWith(Math.floor(value));
15  }
16});
17
18it(`falls back to an alternative native method when getRandomBytesAsync is not available`, async () => {
19  ExpoRandom.getRandomBytesAsync = null;
20  await expect(Random.getRandomBytesAsync(1024));
21  expect(ExpoRandom.getRandomBase64StringAsync).toHaveBeenCalled();
22});
23
24it(`asserts invalid byte count errors`, async () => {
25  await expect(Random.getRandomBytesAsync(-1)).rejects.toThrowError(TypeError);
26  await expect(Random.getRandomBytesAsync(1025)).rejects.toThrowError(TypeError);
27  await expect(Random.getRandomBytesAsync('invalid' as any)).rejects.toThrowError(TypeError);
28  await expect(Random.getRandomBytesAsync(null as any)).rejects.toThrowError(TypeError);
29  await expect(Random.getRandomBytesAsync({} as any)).rejects.toThrowError(TypeError);
30  await expect(Random.getRandomBytesAsync(NaN)).rejects.toThrowError(TypeError);
31});
32