Before:
  call ale#assert#SetUpLinterTest('python', 'pyflakes')
  let b:bin_dir = has('win32') ? 'Scripts' : 'bin'

After:
  unlet! b:bin_dir
  unlet! b:executable
  call ale#assert#TearDownLinterTest()

Execute(The pyflakes command callback should return default string):
  AssertLinter 'pyflakes', ale#Escape('pyflakes') . ' %t'

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

  AssertLinter '~/.local/bin/pyflakes',
  \ ale#Escape('~/.local/bin/pyflakes') . ' %t'

Execute(The pyflakes executable should be run from the virtualenv path):
  call ale#test#SetFilename('python_paths/with_virtualenv/subdir/foo/bar.py')

  let b:executable = ale#path#Simplify(
  \ g:dir . '/python_paths/with_virtualenv/env/' . b:bin_dir . '/pyflakes'
  \)

  AssertLinter b:executable, ale#Escape(b:executable) . ' %t'

Execute(You should be able to override the pyflakes virtualenv lookup):
  call ale#test#SetFilename('python_paths/with_virtualenv/subdir/foo/bar.py')

  let g:ale_python_pyflakes_use_global = 1

  AssertLinter 'pyflakes', ale#Escape('pyflakes') . ' %t'

Execute(Setting executable to 'pipenv' appends 'run pyflakes'):
  let g:ale_python_pyflakes_executable = 'path/to/pipenv'

  AssertLinter 'path/to/pipenv',
  \ ale#Escape('path/to/pipenv') . ' run pyflakes %t',