title: Can't load asset on flutter integration test
body: <p>I am writing a integration test in my flutter app, it works if I run app. But when I run integration test class, it seems failed to load json file from asset. This is my integration test file</p>
  <pre><code>    void main() {
        IntegrationTestWidgetsFlutterBinding.ensureInitialized();
        group('login test', () {
          testWidgets('full login test', (tester) async {
            app.mainCommon(&quot;dev&quot;);
            await tester.pumpAndSettle();
          });
        });
      }
  </code></pre>
  <p>and this is how i load json file</p>
  <pre><code>configString = await rootBundle.loadString('config/dev.json');
  </code></pre>