flutter_test: Tap on a button don't work in drawer

[hawkbee1]

I may have found an issue.

I'm trying to do some TDD with flutter and when the test is running, tapping on a button doesn't work if it's in a drawer. The button works perfectly fine with a normal user.

In the following example we press on two buttons which print a message in the console. Here's the actions :
locate and tap on a button in the scaffold: OK
open the drawer: OK
Locate button in drawer: OK
Tap on the drawer button: nothing happen

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('Test that drawer is apparing and we can click on button',
  (WidgetTester tester) async {
final scaffoldKey = GlobalKey<ScaffoldState>();

await tester.pumpWidget(new MaterialApp(
  title: 'Where Assistant',
  home: Scaffold(
    key: scaffoldKey,
    body: Column(
      children: <Widget>[
        Text('test text'),
        RaisedButton(
          onPressed: () {
            print('OK on main screen');
          },
          child: Icon(Icons.access_alarm),
        ),
      ],
    ),
    drawer: Drawer(
      // Add a ListView to the drawer. This ensures the user can scroll
      // through the options in the Drawer if there isn't enough vertical
      // space to fit everything.
      child: ListView(
        // Important: Remove any padding from the ListView.
        padding: EdgeInsets.zero,
        children: <Widget>[
          DrawerHeader(
            child: Text('Drawer Header'),
            decoration: BoxDecoration(
              color: Colors.blue,
            ),
          ),
          ListTile(
            title: Text('Item 2'),
            onTap: () {
              // Update the state of the app
              // ...
            },
          ),
          RaisedButton(
            onPressed: () {
              print('OK drawer');
            },
            child: Icon(Icons.add),
          )
        ],
      ),
    ),
  ),
));

await tester.pump();

expect(find.text('test text'), findsOneWidget);
expect(find.byIcon(Icons.access_alarm), findsOneWidget);
await tester.tap(find.byIcon(Icons.access_alarm));
expect(find.byIcon(Icons.add), findsNothing);

scaffoldKey.currentState.openDrawer();
await tester.pump(); // drawer should appear

expect(find.text('Item 2'), findsOneWidget);
expect(find.byIcon(Icons.add), findsOneWidget);
await tester.tap(find.byIcon(Icons.add));
print('end of test');
  });
}

I've posted about it on stackoverflow

[hawkbee1]

I tried to investigate deeper by using methods getTopLeft, getBottomRight, getCenter and tapAt :
Scafold is between offset 0;0 and 800;600
Drawer is between offset -304;0 and 0;600
The button the test is trying to tap is between -164;237 and -140;261

With for loops I tapped everywhere and found a zone where it's working : same y coordinates as the button and x=0

[hawkbee1]

finally found a workaround : just need to add some delay before tapping in the drawer. :-/

So I added
await tester.pump(const Duration(milliseconds: 100));
before tapping on buttons

took me too long to figure it.

[evaldobratti]

For those reaching here because tapping something in BottomAppBar, like a IconButton, is not working, the solution was the same.

    await tester.pumpWidget(widget);

    await tester.pump(Duration(milliseconds: 200));

    await tester.tap(find.widgetWithIcon(IconButton, Icons.touch_app));

It seems that, due to entering animation of the whole screen, the IconButton was out of the screen, and waiting a little make it show on the screen and tapping on it will now work.

Sorry for using your issue @hawkbee1, but as the solution was almost the same for a related problem, it may help some people.

[GreenAppers]

I'm still seeing that tester.tap() stops working. I don't know what precise conditions trigger it. But depending on the hierarchy of pumpWidget() it seems tap() will stop working (despite all pump and pumpAndSettle).

For now I went with this workaround:

    //await tester.tap(find.widgetWithText(RaisedGradientButton, l10n.send));
    RaisedGradientButton send = find.widgetWithText(RaisedGradientButton, l10n.send).evaluate().first.widget;
    send.onPressed();

[zeienko-vitalii]

Calling await tester.pump(Duration(milliseconds: 300)); with exactly 300ms before tapping, fix this bug
But still, it's a bug

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.