Before:
  call ale#test#SetDirectory('/testplugin/test/fixers')

After:
  call ale#test#RestoreDirectory()

Execute(Long lines with basic function calls should be broken up correctly):
  AssertEqual
  \ [
  \   'def foo():',
  \   '    some_variable = this_is_a_longer_function(',
  \   'first_argument,',
  \   ' second_argument,',
  \   ' third_with_function_call(',
  \   'foo,',
  \   ' bar,',
  \   '))',
  \ ],
  \ ale#fixers#generic_python#BreakUpLongLines(bufnr(''), [
  \   'def foo():',
  \   '    some_variable = this_is_a_longer_function(first_argument, second_argument, third_with_function_call(foo, bar))',
  \ ])

Execute(Longer lines should be permitted if a configuration file allows it):
  call ale#test#SetFilename('long-line-project/foo/bar.py')

  AssertEqual
  \ [
  \   'x = this_line_is_between_79_and_90_characters(first, second, third, fourth, fifth)',
  \   'y = this_line_is_longer_than_90_characters(',
  \   'much_longer_word,',
  \   ' another_longer_word,',
  \   ' a_third_long_word,',
  \   ')'
  \ ],
  \ ale#fixers#generic_python#BreakUpLongLines(bufnr(''), [
  \   'x = this_line_is_between_79_and_90_characters(first, second, third, fourth, fifth)',
  \   'y = this_line_is_longer_than_90_characters(much_longer_word, another_longer_word, a_third_long_word)',
  \ ])