apidash/test/widgets/button_copy_test.dart

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:apidash/widgets/button_copy.dart';

void main() {
  String copyText = 'This is a sample response generated by ';

  testWidgets('Testing for copy button with label', (tester) async {
    await tester.pumpWidget(
      MaterialApp(
        title: 'Copy Button',
        home: Scaffold(
          body: CopyButton(toCopy: copyText, showLabel: true),
        ),
      ),
    );

    final icon = find.byIcon(Icons.content_copy);
    expect(icon, findsOneWidget);

    final button = find.ancestor(
        of: icon,
        matching: find.byWidgetPredicate((widget) => widget is TextButton));
    expect(button, findsOneWidget);

    await tester.tap(button);
    await tester.pumpAndSettle();

    //TODO: The below test works for `flutter run` but not for `flutter test`
    // var data = await Clipboard.getData('text/plain');
    // expect(data?.text, copyText);
  });

  testWidgets('Testing for copy button without label', (tester) async {
    await tester.pumpWidget(
      MaterialApp(
        title: 'Copy Button',
        home: Scaffold(
          body: CopyButton(toCopy: copyText, showLabel: false),
        ),
      ),
    );

    final icon = find.byIcon(Icons.content_copy);
    expect(icon, findsOneWidget);

    final button = find.byType(IconButton);
    expect(button, findsOneWidget);

    await tester.tap(button);
    await tester.pump();
  });
}