anchor.diff:  
       await tester.pumpWidget(PolarisApp());
   
  -    expect(_connectButton, findsOneWidget);
  -    expect(_disconnectButton, findsNothing);
  +    expect(connectButton, findsOneWidget);
  +    expect(disconnectButton, findsNothing);
     });
   
     testWidgets('Disconnect returns to connect screen', (WidgetTester tester) async {
  
positive.code: 
      await tester.pumpWidget(PolarisApp());
  
      await tester.enterText(_urlInputField, badHostURL);
      await tester.tap(_connectButton);
      await tester.pump();
      expect(find.widgetWithText(SnackBar, errorNetwork), findsOneWidget);
    });
  
negative.code:     final client = getIt<Client>();
      when(client.get(apiVersionEndpoint)).thenAnswer((_) async => Response(compatibleAPIVersion, 200));
  
      await tester.enterText(urlInputField, goodhostURL);
      await tester.tap(connectButton);
      await tester.pump();
      expect(urlInputField, findsNothing);
  
      await tester.tap(disconnectButton);
      await tester.pump();
      expect(urlInputField, findsOneWidget);
    });
  }
  