Before:
  function! CheckPath(path) abort
    return ale#path#IsBufferPath(bufnr(''), ale#path#Simplify(a:path))
  endfunction

After:
  delfunction CheckPath

Execute(ale#path#IsBufferPath should match simple relative paths):
  call ale#test#SetFilename('app/foo.txt')

  Assert CheckPath('app/foo.txt'), 'No match for foo.txt'
  Assert !CheckPath('app/bar.txt'), 'Bad match for bar.txt'

Execute(ale#path#IsBufferPath should match relative paths with dots):
  call ale#test#SetFilename('app/foo.txt')

  " Skip these checks on Windows.
  if !has('win32')
    Assert CheckPath('../../app/foo.txt'), 'No match for ../../app/foo.txt'
  endif

Execute(ale#path#IsBufferPath should match absolute paths):
  silent file! foo.txt

  Assert CheckPath(getcwd() . '/foo.txt'), 'No match for foo.txt'
  Assert !CheckPath(getcwd() . '/bar.txt'), 'Bad match for bar.txt'

Execute(ale#path#IsBufferPath should match paths beginning with ./):
  silent file! foo.txt

  if !has('win32')
    Assert ale#path#IsBufferPath(bufnr(''), './foo.txt'), 'No match for ./foo.txt'
  endif

Execute(ale#path#IsBufferPath should match if our path ends with the test path):
  silent file! foo/bar/baz.txt

  Assert CheckPath('bar/baz.txt'), 'No match for bar/baz.txt'

Execute(ale#path#IsBufferPath should match paths with redundant slashes):
  silent file! foo.txt

  Assert CheckPath(getcwd() . '////foo.txt'), 'No match for foo.txt'

Execute(ale#path#IsBufferPath should accept various names for stdin):
  Assert ale#path#IsBufferPath(bufnr(''), '-')
  Assert ale#path#IsBufferPath(bufnr(''), 'stdin')
  Assert ale#path#IsBufferPath(bufnr(''), '<stdin>')
  Assert ale#path#IsBufferPath(bufnr(''), '<somethingelse>')

Execute(ale#path#IsBufferPath should match files in /tmp):
  call ale#test#SetFilename('app/test.ts')

  Assert ale#path#IsBufferPath(bufnr(''), tempname() . '/test.ts')