test open scanner

test/widget_tests/scanner_test.dart

@@ -0,0 +1,42 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mobile_scanner/mobile_scanner.dart';
+import 'package:provider/provider.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:smoke_cess_app/providers/settings_provider.dart';
+import 'package:smoke_cess_app/widgets/buttons/text_icon_button.dart';
+import 'package:smoke_cess_app/widgets/scanner.dart';
+
+import '../mock/settings_mock.dart';
+
+void main() {
+  mockSharedPreferences();
+
+  group('MyScanner', () {
+    testWidgets('Scanner should start after Button is pressed',
+        (widgetTester) async {
+      SettingsProvider settingsProvider = SettingsProvider();
+      expect(settingsProvider.scanning, false);
+
+      await widgetTester.pumpWidget(MaterialApp(
+        home: Column(
+          children: [
+            ChangeNotifierProvider(
+                create: (context) => settingsProvider, child: const MyScanner())
+          ],
+        ),
+      ));
+
+      final startScannerButton = find.byType(TextIconButton);
+      final scanner = find.byType(MobileScanner);
+      expect(startScannerButton, findsOneWidget);
+      expect(scanner, findsNothing);
+
+      await widgetTester.tap(startScannerButton);
+      await widgetTester.pump();
+      expect(startScannerButton, findsNothing);
+      expect(scanner, findsOneWidget);
+      expect(settingsProvider.scanning, true);
+    });
+  });
+}