Execute(Relative paths should be resolved correctly):
  AssertEqual
  \ '/foo/bar/baz/whatever.txt',
  \ ale#path#GetAbsPath('/foo/bar/xyz', '../baz/whatever.txt')
  AssertEqual
  \ has('win32') ? '/foo/bar/xyz\whatever.txt' : '/foo/bar/xyz/whatever.txt',
  \ ale#path#GetAbsPath('/foo/bar/xyz', './whatever.txt')
  AssertEqual
  \ has('win32') ? '/foo/bar/xyz\whatever.txt' : '/foo/bar/xyz/whatever.txt',
  \ ale#path#GetAbsPath('/foo/bar/xyz', 'whatever.txt')

Execute(Absolute paths should be resolved correctly):
  AssertEqual
  \ '/ding/dong',
  \ ale#path#GetAbsPath('/foo/bar/xyz', '/ding/dong')