How to open a drawer in flutter test



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1















I am trying to test a custom drawer but find it hard opening it in the test, tried the following to begin with and even this test doesn't pass. The error is: Bad state: no element.



void main() 
testWidgets('my drawer test', (WidgetTester tester) async
final displayName = "displayName";
var drawKey = UniqueKey();
await tester.pumpWidget(MaterialApp(
home: Scaffold(
drawer: Drawer(key: drawKey, child: Text(displayName),),
)));
await tester.tap(find.byKey(drawKey));
expect(find.text(displayName), findsOneWidget);
);










share|improve this question




























    1















    I am trying to test a custom drawer but find it hard opening it in the test, tried the following to begin with and even this test doesn't pass. The error is: Bad state: no element.



    void main() 
    testWidgets('my drawer test', (WidgetTester tester) async
    final displayName = "displayName";
    var drawKey = UniqueKey();
    await tester.pumpWidget(MaterialApp(
    home: Scaffold(
    drawer: Drawer(key: drawKey, child: Text(displayName),),
    )));
    await tester.tap(find.byKey(drawKey));
    expect(find.text(displayName), findsOneWidget);
    );










    share|improve this question
























      1












      1








      1








      I am trying to test a custom drawer but find it hard opening it in the test, tried the following to begin with and even this test doesn't pass. The error is: Bad state: no element.



      void main() 
      testWidgets('my drawer test', (WidgetTester tester) async
      final displayName = "displayName";
      var drawKey = UniqueKey();
      await tester.pumpWidget(MaterialApp(
      home: Scaffold(
      drawer: Drawer(key: drawKey, child: Text(displayName),),
      )));
      await tester.tap(find.byKey(drawKey));
      expect(find.text(displayName), findsOneWidget);
      );










      share|improve this question














      I am trying to test a custom drawer but find it hard opening it in the test, tried the following to begin with and even this test doesn't pass. The error is: Bad state: no element.



      void main() 
      testWidgets('my drawer test', (WidgetTester tester) async
      final displayName = "displayName";
      var drawKey = UniqueKey();
      await tester.pumpWidget(MaterialApp(
      home: Scaffold(
      drawer: Drawer(key: drawKey, child: Text(displayName),),
      )));
      await tester.tap(find.byKey(drawKey));
      expect(find.text(displayName), findsOneWidget);
      );







      flutter flutter-test






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 14 '18 at 11:23









      stt106stt106

      1,3111428




      1,3111428






















          1 Answer
          1






          active

          oldest

          votes


















          5














          You're calling tap() on the Drawer, but it isn't in view as it's hidden on the left. Because of this, the Finder doesn't find any elements and the tap() is unsuccessful. And even if the Finder found the Drawer, tapping on the Drawer itself doesn't open it anyway.



          One way, and in my opinion, the simplest way of doing it is to provide a GlobalKey for the Scaffold and call openDrawer() on the current State of it. You could also tap on the hamburger icon or swipe from the left - but calling openDrawer() is more deterministic:



          void main() 
          testWidgets('my drawer test', (WidgetTester tester) async
          final scaffoldKey = GlobalKey<ScaffoldState>();
          const displayName = "displayName";

          await tester.pumpWidget(
          MaterialApp(
          home: Scaffold(
          key: scaffoldKey,
          drawer: const Text(displayName),
          ),
          ),
          );

          scaffoldKey.currentState.openDrawer();
          await tester.pump();

          expect(find.text(displayName), findsOneWidget);
          );






          share|improve this answer























          • super! thanks a lot

            – stt106
            Nov 14 '18 at 11:46











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          1 Answer
          1






          active

          oldest

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          active

          oldest

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          active

          oldest

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          5














          You're calling tap() on the Drawer, but it isn't in view as it's hidden on the left. Because of this, the Finder doesn't find any elements and the tap() is unsuccessful. And even if the Finder found the Drawer, tapping on the Drawer itself doesn't open it anyway.



          One way, and in my opinion, the simplest way of doing it is to provide a GlobalKey for the Scaffold and call openDrawer() on the current State of it. You could also tap on the hamburger icon or swipe from the left - but calling openDrawer() is more deterministic:



          void main() 
          testWidgets('my drawer test', (WidgetTester tester) async
          final scaffoldKey = GlobalKey<ScaffoldState>();
          const displayName = "displayName";

          await tester.pumpWidget(
          MaterialApp(
          home: Scaffold(
          key: scaffoldKey,
          drawer: const Text(displayName),
          ),
          ),
          );

          scaffoldKey.currentState.openDrawer();
          await tester.pump();

          expect(find.text(displayName), findsOneWidget);
          );






          share|improve this answer























          • super! thanks a lot

            – stt106
            Nov 14 '18 at 11:46















          5














          You're calling tap() on the Drawer, but it isn't in view as it's hidden on the left. Because of this, the Finder doesn't find any elements and the tap() is unsuccessful. And even if the Finder found the Drawer, tapping on the Drawer itself doesn't open it anyway.



          One way, and in my opinion, the simplest way of doing it is to provide a GlobalKey for the Scaffold and call openDrawer() on the current State of it. You could also tap on the hamburger icon or swipe from the left - but calling openDrawer() is more deterministic:



          void main() 
          testWidgets('my drawer test', (WidgetTester tester) async
          final scaffoldKey = GlobalKey<ScaffoldState>();
          const displayName = "displayName";

          await tester.pumpWidget(
          MaterialApp(
          home: Scaffold(
          key: scaffoldKey,
          drawer: const Text(displayName),
          ),
          ),
          );

          scaffoldKey.currentState.openDrawer();
          await tester.pump();

          expect(find.text(displayName), findsOneWidget);
          );






          share|improve this answer























          • super! thanks a lot

            – stt106
            Nov 14 '18 at 11:46













          5












          5








          5







          You're calling tap() on the Drawer, but it isn't in view as it's hidden on the left. Because of this, the Finder doesn't find any elements and the tap() is unsuccessful. And even if the Finder found the Drawer, tapping on the Drawer itself doesn't open it anyway.



          One way, and in my opinion, the simplest way of doing it is to provide a GlobalKey for the Scaffold and call openDrawer() on the current State of it. You could also tap on the hamburger icon or swipe from the left - but calling openDrawer() is more deterministic:



          void main() 
          testWidgets('my drawer test', (WidgetTester tester) async
          final scaffoldKey = GlobalKey<ScaffoldState>();
          const displayName = "displayName";

          await tester.pumpWidget(
          MaterialApp(
          home: Scaffold(
          key: scaffoldKey,
          drawer: const Text(displayName),
          ),
          ),
          );

          scaffoldKey.currentState.openDrawer();
          await tester.pump();

          expect(find.text(displayName), findsOneWidget);
          );






          share|improve this answer













          You're calling tap() on the Drawer, but it isn't in view as it's hidden on the left. Because of this, the Finder doesn't find any elements and the tap() is unsuccessful. And even if the Finder found the Drawer, tapping on the Drawer itself doesn't open it anyway.



          One way, and in my opinion, the simplest way of doing it is to provide a GlobalKey for the Scaffold and call openDrawer() on the current State of it. You could also tap on the hamburger icon or swipe from the left - but calling openDrawer() is more deterministic:



          void main() 
          testWidgets('my drawer test', (WidgetTester tester) async
          final scaffoldKey = GlobalKey<ScaffoldState>();
          const displayName = "displayName";

          await tester.pumpWidget(
          MaterialApp(
          home: Scaffold(
          key: scaffoldKey,
          drawer: const Text(displayName),
          ),
          ),
          );

          scaffoldKey.currentState.openDrawer();
          await tester.pump();

          expect(find.text(displayName), findsOneWidget);
          );







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 14 '18 at 11:43









          Iiro KrankkaIiro Krankka

          1,68021832




          1,68021832












          • super! thanks a lot

            – stt106
            Nov 14 '18 at 11:46

















          • super! thanks a lot

            – stt106
            Nov 14 '18 at 11:46
















          super! thanks a lot

          – stt106
          Nov 14 '18 at 11:46





          super! thanks a lot

          – stt106
          Nov 14 '18 at 11:46



















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