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import { Either } from '@emprespresso/pengueno';
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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