directionality_test.dart 2.05 KB
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// Copyright 2014 The Flutter Authors. All rights reserved.
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// 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/widgets.dart';

void main() {
  testWidgets('Directionality', (WidgetTester tester) async {
    final List<TextDirection> log = <TextDirection>[];
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    final Widget inner = Builder(
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      builder: (BuildContext context) {
        log.add(Directionality.of(context));
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        return const Placeholder();
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      }
    );
    await tester.pumpWidget(
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      Directionality(
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        textDirection: TextDirection.ltr,
        child: inner,
      ),
    );
    expect(log, <TextDirection>[TextDirection.ltr]);
    await tester.pumpWidget(
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      Directionality(
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        textDirection: TextDirection.ltr,
        child: inner,
      ),
    );
    expect(log, <TextDirection>[TextDirection.ltr]);
    await tester.pumpWidget(
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      Directionality(
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        textDirection: TextDirection.rtl,
        child: inner,
      ),
    );
    expect(log, <TextDirection>[TextDirection.ltr, TextDirection.rtl]);
    await tester.pumpWidget(
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      Directionality(
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        textDirection: TextDirection.rtl,
        child: inner,
      ),
    );
    expect(log, <TextDirection>[TextDirection.ltr, TextDirection.rtl]);
    await tester.pumpWidget(
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      Directionality(
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        textDirection: TextDirection.ltr,
        child: inner,
      ),
    );
    expect(log, <TextDirection>[TextDirection.ltr, TextDirection.rtl, TextDirection.ltr]);
  });

  testWidgets('Directionality default', (WidgetTester tester) async {
    bool good = false;
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    await tester.pumpWidget(Builder(
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      builder: (BuildContext context) {
        expect(Directionality.of(context), isNull);
        good = true;
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        return const Placeholder();
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      },
    ));
    expect(good, isTrue);
  });

  testWidgets('Directionality can\'t be null', (WidgetTester tester) async {
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    expect(() {
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      Directionality(textDirection: nonconst(null), child: const Placeholder());
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    }, throwsAssertionError);
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  });
}