page_storage_test.dart 2.85 KB
Newer Older
1 2 3 4 5 6 7 8 9
// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

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

void main() {
  testWidgets('PageStorage read and write', (WidgetTester tester) async {
10
    final Key builderKey = const PageStorageKey<String>('builderKey');
11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
    StateSetter setState;
    int storedValue = 0;

    await tester.pumpWidget(
      new MaterialApp(
        home: new StatefulBuilder(
          key: builderKey,
          builder: (BuildContext context, StateSetter setter) {
            PageStorage.of(context).writeState(context, storedValue);
            setState = setter;
            return new Center(
              child: new Text('storedValue: $storedValue')
            );
          }
        )
      )
    );

29
    final Element builderElement = tester.element(find.byKey(builderKey));
30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58
    expect(PageStorage.of(builderElement), isNotNull);
    expect(PageStorage.of(builderElement).readState(builderElement), equals(storedValue));

    setState(() {
      storedValue = 1;
    });
    await tester.pump();
    expect(PageStorage.of(builderElement).readState(builderElement), equals(storedValue));
  });

  testWidgets('PageStorage read and write by identifier', (WidgetTester tester) async {
    StateSetter setState;
    int storedValue = 0;

    Widget buildWidthKey(Key key) {
      return new MaterialApp(
        home: new StatefulBuilder(
          key: key,
          builder: (BuildContext context, StateSetter setter) {
            PageStorage.of(context).writeState(context, storedValue, identifier: 123);
            setState = setter;
            return new Center(
              child: new Text('storedValue: $storedValue')
            );
          }
        )
      );
    }

59
    Key key = const Key('Key one');
60 61 62 63 64 65 66 67
    await tester.pumpWidget(buildWidthKey(key));
    Element builderElement = tester.element(find.byKey(key));
    expect(PageStorage.of(builderElement), isNotNull);
    expect(PageStorage.of(builderElement).readState(builderElement), isNull);
    expect(PageStorage.of(builderElement).readState(builderElement, identifier: 123), equals(storedValue));

    // New StatefulBuilder widget - different key - but the same PageStorage identifier.

68
    key = const Key('Key two');
69 70 71 72 73 74 75 76 77 78 79 80 81 82
    await tester.pumpWidget(buildWidthKey(key));
    builderElement = tester.element(find.byKey(key));
    expect(PageStorage.of(builderElement), isNotNull);
    expect(PageStorage.of(builderElement).readState(builderElement), isNull);
    expect(PageStorage.of(builderElement).readState(builderElement, identifier: 123), equals(storedValue));

    setState(() {
      storedValue = 1;
    });
    await tester.pump();
    expect(PageStorage.of(builderElement).readState(builderElement, identifier: 123), equals(storedValue));
  });

}