Before:
  runtime ale_linters/python/pycodestyle.vim
  Save g:ale_python_pycodestyle_executable,
  \ g:ale_python_pycodestyle_options,
  \ g:ale_python_pycodestyle_use_global

After:
  call ale#linter#Reset()
  Restore

Execute(The pycodestyle command callback should return default string):
  AssertEqual ale#Escape('pycodestyle') . '  -',
  \ ale_linters#python#pycodestyle#GetCommand(bufnr(''))

Execute(The pycodestyle command callback should allow options):
  let g:ale_python_pycodestyle_options = '--exclude=test*.py'

  AssertEqual ale#Escape('pycodestyle') . ' --exclude=test*.py -',
  \ ale_linters#python#pycodestyle#GetCommand(bufnr(''))

Execute(The pycodestyle executable should be configurable):
  let g:ale_python_pycodestyle_executable = '~/.local/bin/pycodestyle'

  AssertEqual ale#Escape('~/.local/bin/pycodestyle') . '  -',
  \ ale_linters#python#pycodestyle#GetCommand(bufnr(''))