bookshelf/bookshelf_flutter/test/bloc/scanner/scanner_bloc_test.dart

import 'package:flutter_test/flutter_test.dart';
import 'package:bookshelf_flutter/features/scanner/bloc/scanner_bloc.dart';
import 'package:bookshelf_flutter/features/scanner/bloc/scanner_event.dart';
import 'package:bookshelf_flutter/features/scanner/bloc/scanner_state.dart';

void main() {
  group('ScannerBloc', () {
    late ScannerBloc scannerBloc;

    setUp(() {
      scannerBloc = ScannerBloc();
    });

    tearDown(() {
      scannerBloc.close();
    });

    test('initial state is ScannerState.initial()', () {
      expect(scannerBloc.state, isA<ScannerState>());
      expect(scannerBloc.state.isScanning, false);
      expect(scannerBloc.state.isProcessing, false);
    });

    group('StartScanning', () {
      test('sets isScanning to true and clears errors', () async {
        scannerBloc.add(const StartScanning());
        await Future.delayed(Duration.zero);

        expect(scannerBloc.state.isScanning, true);
        expect(scannerBloc.state.isProcessing, false);
        expect(scannerBloc.state.errorMessage, isNull);
      });
    });

    group('StopScanning', () {
      test('sets isScanning to false', () async {
        scannerBloc.add(const StartScanning());
        await Future.delayed(Duration.zero);

        scannerBloc.add(const StopScanning());
        await Future.delayed(Duration.zero);

        expect(scannerBloc.state.isScanning, false);
      });
    });

    group('BookDetected', () {
      test('stores detected book data and sets isProcessing to true', () async {
        final bookData = {
          'title': 'Detected Book',
          'author': 'Detected Author',
        };

        scannerBloc.add(BookDetected(bookData));
        await Future.delayed(Duration.zero);

        expect(scannerBloc.state.detectedBookData, bookData);
        expect(scannerBloc.state.isProcessing, true);
      });
    });

    group('ClearDetectedBook', () {
      test('clears detected book data and resets processing', () async {
        final bookData = {
          'title': 'Detected Book',
          'author': 'Detected Author',
        };

        scannerBloc.add(BookDetected(bookData));
        await Future.delayed(Duration.zero);

        expect(scannerBloc.state.detectedBookData, isNotNull);

        scannerBloc.add(const ClearDetectedBook());
        await Future.delayed(Duration.zero);

        expect(scannerBloc.state.detectedBookData, isNull);
        expect(scannerBloc.state.isProcessing, false);
      });
    });
  });
}