import 'package:flutter_test/flutter_test.dart';
import 'package:marianum_mobile/utils/exponential_backoff.dart';

void main() {
  group('exponentialBackoff', () {
    test('doubles per attempt starting at base', () {
      expect(exponentialBackoff(1), const Duration(milliseconds: 500));
      expect(exponentialBackoff(2), const Duration(seconds: 1));
      expect(exponentialBackoff(3), const Duration(seconds: 2));
      expect(exponentialBackoff(4), const Duration(seconds: 4));
    });

    test('caps at max', () {
      expect(exponentialBackoff(5), const Duration(seconds: 5));
      expect(exponentialBackoff(40), const Duration(seconds: 5));
      expect(exponentialBackoff(1000), const Duration(seconds: 5));
    });

    test('treats attempt 0 and negatives like the first attempt', () {
      expect(exponentialBackoff(0), const Duration(milliseconds: 500));
      expect(exponentialBackoff(-3), const Duration(milliseconds: 500));
    });

    test('honours custom base and max', () {
      expect(
        exponentialBackoff(
          3,
          base: const Duration(seconds: 1),
          max: const Duration(seconds: 3),
        ),
        const Duration(seconds: 3),
      );
    });
  });
}