Before:
  silent! cd /testplugin/test/util

Execute(CdString should output the correct command string):
  AssertEqual 'cd ''/foo bar/baz'' && ', ale#path#CdString('/foo bar/baz')

Execute(BufferCdString should output the correct command string):
  AssertEqual 'cd ' . shellescape(getcwd()) . ' && ', ale#path#BufferCdString(bufnr(''))