size_observer_test.dart 1.6 KB
Newer Older
1

2 3
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
4 5 6 7 8 9 10
import 'package:test/test.dart';

import 'widget_tester.dart';

void main() {
  test('SizeObserver notices zero size', () {
    testWidgets((WidgetTester tester) {
11
      List<Size> results = <Size>[];
12 13
      tester.pumpWidget(new Center(
        child: new SizeObserver(
14
          onSizeChanged: (Size size) { results.add(size); },
15 16 17 18 19 20 21 22
          child: new Container(width:0.0, height:0.0)
        )
      ));
      expect(results, equals([Size.zero]));
      tester.pump();
      expect(results, equals([Size.zero]));
      tester.pumpWidget(new Center(
        child: new SizeObserver(
23
          onSizeChanged: (Size size) { results.add(size); },
24 25 26 27 28 29 30 31
          child: new Container(width:100.0, height:0.0)
        )
      ));
      expect(results, equals([Size.zero, const Size(100.0, 0.0)]));
      tester.pump();
      expect(results, equals([Size.zero, const Size(100.0, 0.0)]));
      tester.pumpWidget(new Center(
        child: new SizeObserver(
32
          onSizeChanged: (Size size) { results.add(size); },
33 34 35 36 37 38 39 40
          child: new Container(width:0.0, height:0.0)
        )
      ));
      expect(results, equals([Size.zero, const Size(100.0, 0.0), Size.zero]));
      tester.pump();
      expect(results, equals([Size.zero, const Size(100.0, 0.0), Size.zero]));
      tester.pumpWidget(new Center(
        child: new SizeObserver(
41
          onSizeChanged: (Size size) { results.add(size); },
42 43 44 45 46 47 48
          child: new Container(width:0.0, height:0.0)
        )
      ));
      expect(results, equals([Size.zero, const Size(100.0, 0.0), Size.zero]));
    });
  });
}