flutter/examples/api/test/material/selection_container/selection_container.0_test.dart

// Copyright 2014 The Flutter 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/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter_api_samples/material/selection_container/selection_container.0.dart' as example;
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets('The SelectionContainer should transform the partial selection into an all selection', (WidgetTester tester) async {
    await tester.pumpWidget(
      const example.SelectionContainerExampleApp(),
    );

    expect(find.widgetWithText(AppBar, 'SelectionContainer Sample'), findsOne);

    final RenderParagraph paragraph1 = tester.renderObject<RenderParagraph>(
      find.descendant(
        of: find.text('Row 1'),
        matching: find.byType(RichText),
      ),
    );
    final RenderParagraph paragraph2 = tester.renderObject<RenderParagraph>(
      find.descendant(
        of: find.text('Row 2'),
        matching: find.byType(RichText),
      ),
    );
    final RenderParagraph paragraph3 = tester.renderObject<RenderParagraph>(
      find.descendant(
        of: find.text('Row 3'),
        matching: find.byType(RichText),
      ),
    );
    final Rect paragraph1Rect = tester.getRect(find.text('Row 1'));
    final TestGesture gesture = await tester.startGesture(
      paragraph1Rect.topLeft,
      kind: PointerDeviceKind.mouse,
    );
    addTearDown(gesture.removePointer);
    await tester.pump();

    await gesture.moveTo(paragraph1Rect.center);
    await tester.pump();
    expect(
      paragraph1.selections.first,
      const TextSelection(baseOffset: 0, extentOffset: 5),
    );
    expect(
      paragraph2.selections.first,
      const TextSelection(baseOffset: 0, extentOffset: 5),
    );
    expect(
      paragraph3.selections.first,
      const TextSelection(baseOffset: 0, extentOffset: 5),
    );

    await gesture.up();
  });
}