xterm.dart/test/src/core/reflow_test.dart

import 'package:test/test.dart';
import 'package:xterm/src/terminal.dart';

void main() {
  test('reflow() can reflow a single line', () {
    final terminal = Terminal();

    terminal.write('1234567890abcdefg');
    terminal.resize(10, 10);

    expect(terminal.buffer.lines[0].toString(), '1234567890');
    expect(terminal.buffer.lines[1].toString(), 'abcdefg');
    expect(terminal.buffer.lines[0].isWrapped, isFalse);
    expect(terminal.buffer.lines[1].isWrapped, isTrue);

    terminal.resize(13, 10);

    expect(terminal.buffer.lines[0].toString(), '1234567890abc');
    expect(terminal.buffer.lines[1].toString(), 'defg');
    expect(terminal.buffer.lines[0].isWrapped, isFalse);
    expect(terminal.buffer.lines[1].isWrapped, isTrue);

    terminal.resize(20, 10);

    expect(terminal.buffer.lines[0].toString(), '1234567890abcdefg');
    expect(terminal.buffer.lines[0].isWrapped, isFalse);
  });

  test('reflow() can reflow a single line to multiple lines', () {
    final terminal = Terminal();

    terminal.write('1234567890abcdefg');
    terminal.resize(5, 10);

    expect(terminal.buffer.lines[0].toString(), '12345');
    expect(terminal.buffer.lines[1].toString(), '67890');
    expect(terminal.buffer.lines[2].toString(), 'abcde');
    expect(terminal.buffer.lines[3].toString(), 'fg');

    expect(terminal.buffer.lines[0].isWrapped, isFalse);
    expect(terminal.buffer.lines[1].isWrapped, isTrue);
    expect(terminal.buffer.lines[2].isWrapped, isTrue);
    expect(terminal.buffer.lines[3].isWrapped, isTrue);

    terminal.resize(6, 10);

    expect(terminal.buffer.lines[0].toString(), '123456');
    expect(terminal.buffer.lines[1].toString(), '7890ab');
    expect(terminal.buffer.lines[2].toString(), 'cdefg');

    expect(terminal.buffer.lines[0].isWrapped, isFalse);
    expect(terminal.buffer.lines[1].isWrapped, isTrue);
    expect(terminal.buffer.lines[2].isWrapped, isTrue);
  });

  test('reflow() can reflow wide characters', () {
    final terminal = Terminal();

    terminal.write('床前明月光疑是地上霜');
    terminal.resize(10, 10);

    expect(terminal.buffer.lines[0].toString(), '床前明月光');
    expect(terminal.buffer.lines[1].toString(), '疑是地上霜');

    terminal.resize(9, 10);

    expect(terminal.buffer.lines[0].toString(), '床前明月');
    expect(terminal.buffer.lines[1].toString(), '光疑是地');
    expect(terminal.buffer.lines[2].toString(), '上霜');

    terminal.resize(11, 10);

    expect(terminal.buffer.lines[0].toString(), '床前明月光');
    expect(terminal.buffer.lines[1].toString(), '疑是地上霜');

    terminal.resize(13, 10);
    expect(terminal.buffer.lines[0].toString(), '床前明月光疑');
    expect(terminal.buffer.lines[1].toString(), '是地上霜');
  });
}