xterm.dart/test/src/terminal_test.dart

import 'package:test/test.dart';
import 'package:xterm/core.dart';

void main() {
  group('Terminal.inputHandler', () {
    test('can be set to null', () {
      final terminal = Terminal(inputHandler: null);
      expect(() => terminal.keyInput(TerminalKey.keyA), returnsNormally);
    });

    test('can be changed', () {
      final handler1 = _TestInputHandler();
      final handler2 = _TestInputHandler();
      final terminal = Terminal(inputHandler: handler1);

      terminal.keyInput(TerminalKey.keyA);
      expect(handler1.events, isNotEmpty);

      terminal.inputHandler = handler2;

      terminal.keyInput(TerminalKey.keyA);
      expect(handler2.events, isNotEmpty);
    });
  });
}

class _TestInputHandler implements TerminalInputHandler {
  final events = <TerminalInputEvent>[];

  @override
  String? call(TerminalInputEvent event) {
    events.add(event);
    return null;
  }
}