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import { Either } from '../lib/index';
describe('Either.basic', () => {
test('mapRight/mapLeft/swap', () => {
const r = Either.right<string, number>(2)
.mapRight((n) => n + 1)
.mapLeft((e) => e.toUpperCase());
expect(r.right().get()).toBe(3);
expect(r.swap().left().get()).toBe(3);
const l = Either.left<string, number>('nope').mapRight((n) => n + 1);
expect(l.left().get()).toBe('nope');
expect(l.swap().right().get()).toBe('nope');
});
test('joinRight combines rights', () => {
const a = Either.right<string, number>(2);
const b = Either.right<string, number>(3);
const res = a.joinRight(b, (x, y) => x + y);
expect(res.right().get()).toBe(5);
});
});
describe('Either.retrying', () => {
beforeEach(() => {
jest.clearAllMocks();
});
test('succeeds on first attempt', async () => {
const supplier = jest.fn().mockResolvedValue(Either.right<string, string>('success'));
const interval = jest.fn().mockResolvedValue(undefined);
const result = await Either.retrying(supplier, 3, interval);
expect(result.right().get()).toBe('success');
expect(supplier).toHaveBeenCalledTimes(1);
});
test('never succeeds after all attempts', async () => {
const supplier = jest.fn().mockResolvedValue(Either.left<string, string>('failed'));
const interval = jest.fn().mockResolvedValue(undefined);
const result = await Either.retrying(supplier, 3, interval);
expect(result.left().get()).toBe('failed');
expect(supplier).toHaveBeenCalledTimes(3);
});
test('attempts correct number of times and calls interval with backoff', async () => {
const supplier = jest
.fn()
.mockResolvedValueOnce(Either.left<string, string>('attempt 1 failed'))
.mockResolvedValueOnce(Either.left<string, string>('attempt 2 failed'))
.mockResolvedValueOnce(Either.right<string, string>('attempt 3 success'));
const interval = jest.fn().mockResolvedValue(undefined);
const result = await Either.retrying(supplier, 3, interval);
expect(result.right().get()).toBe('attempt 3 success');
expect(supplier).toHaveBeenCalledTimes(3);
expect(interval).toHaveBeenCalledTimes(3);
expect(interval).toHaveBeenNthCalledWith(1, 0);
expect(interval).toHaveBeenNthCalledWith(2, 1);
expect(interval).toHaveBeenNthCalledWith(3, 2);
});
});
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