在颤振集成测试中提交TextField

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

void main() {
  testWidgets('TextField can receive input', (WidgetTester tester) async {
    // Build our app and trigger a frame.
    await tester.pumpWidget(MyApp());

    // Find the TextField and type some text into it.
    await tester.tap(find.byType(TextField));
    await tester.enterText(find.byType(TextField), 'Hello, World!');

    // Verify that the TextField has the expected text.
    expect(find.text('Hello, World!'), findsOneWidget);
  });
}

TextField(
  autofocus: true,
  decoration: InputDecoration(
    labelText: 'Enter text',
  ),
)

TextField(
  decoration: InputDecoration(
    labelText: 'Enter text',
    errorText: _validateInput(_textController.text),
  ),
  controller: _textController,
  onChanged: _validateInput,
)

String _validateInput(String value) {
  if (value.isEmpty) {
    return 'Please enter some text';
  }
  return null;
}