Melo/test/settings/library_stats_test.dart

import 'package:flutter_test/flutter_test.dart';
import 'package:melo/library/database.dart';
import 'package:melo/settings/library_stats.dart';

Song _song({required String id, int? durationMs}) {
  return Song(
    id: id,
    path: '/$id.mp3',
    title: id,
    durationMs: durationMs,
    dateAddedMs: 0,
    updatedAtMs: 0,
    deleted: false,
    playCount: 0,
    categoriesEdited: false,
  );
}

void main() {
  group('totalDuration', () {
    test('leere Liste ergibt Duration.zero', () {
      expect(totalDuration([]), Duration.zero);
    });

    test('überspringt Songs ohne bekannte Dauer', () {
      final songs = [
        _song(id: 'a', durationMs: 200000),
        _song(id: 'b', durationMs: 185000),
        _song(id: 'c', durationMs: null),
      ];
      expect(totalDuration(songs), const Duration(milliseconds: 385000));
    });
  });

  group('formatTotalDuration', () {
    test('leere Liste ergibt "0m"', () {
      expect(formatTotalDuration([]), '0m');
    });

    test('formatiert unter einer Stunde ohne Stunden-Anteil', () {
      final songs = [_song(id: 'a', durationMs: 6 * 60 * 1000)];
      expect(formatTotalDuration(songs), '6m');
    });

    test('formatiert Stunden und Minuten korrekt', () {
      // 200000ms + 185000ms = 385000ms = 6min 25s -> aufgerundet auf 6 Minuten
      final songs = [
        _song(id: 'a', durationMs: 200000),
        _song(id: 'b', durationMs: 185000),
        _song(id: 'c', durationMs: null),
      ];
      expect(formatTotalDuration(songs), '6m');
    });

    test('formatiert mehr als eine Stunde mit Stunden-Anteil', () {
      final songs = [
        _song(id: 'a', durationMs: const Duration(hours: 2, minutes: 15).inMilliseconds),
      ];
      expect(formatTotalDuration(songs), '2h 15m');
    });
  });
}