def test_cmdline(str, expected)
  result = KernAux.cmdline str

  assert_true result.instance_of? Array
  assert_true result.frozen?
  result.each do |item|
    assert_true item.instance_of? String
    assert_true item.frozen?
  end

  assert_equal result, expected
end

assert 'default' do
  test_cmdline 'foo bar\\ baz "car cdr"', ['foo', 'bar baz', 'car cdr']
end

assert 'when str is empty' do
  test_cmdline '', []
end

assert 'when str has invalid type' do
  assert_raise TypeError, 'Integer cannot be converted to String' do
    KernAux.cmdline 123
  end
end

assert 'when str has EOL after backslash' do
  assert_raise KernAux::CmdlineError, 'EOL after backslash' do
    KernAux.cmdline '\\'
  end
end

assert 'when str has EOL after backslash inside quote' do
  assert_raise KernAux::CmdlineError, 'EOL after backslash inside quote' do
    KernAux.cmdline '"\\'
  end
end

assert 'when str has unescaped quotation mark' do
  assert_raise KernAux::CmdlineError, 'unescaped quotation mark' do
    KernAux.cmdline 'foo"'
  end
end

assert 'when str has EOL inside quote' do
  assert_raise KernAux::CmdlineError, 'EOL inside quote' do
    KernAux.cmdline '"'
  end
end

assert 'when there are not too many args' do
  test_cmdline 'a ' * 256, ['a'] * 256
end

assert 'when there are too many args' do
  assert_raise KernAux::CmdlineError, 'too many args' do
    KernAux.cmdline 'a ' * 257
  end
end

assert 'when args don\'t cause buffer overflow' do
  test_cmdline 'a' * 4095, ['a' * 4095]
end

assert 'when args cause buffer overflow' do
  assert_raise KernAux::CmdlineError, 'buffer overflow' do
    KernAux.cmdline 'a' * 4096
  end
end