code: def testJoin(self):
      fs = gfile.get_filesystem("file://foo")
  
      # relative
      self.assertEqual(
          fs.join("bar", "foo", "hi"),
          "bar/foo/hi",
      )
      # absolute with protocol
      self.assertEqual(
          fs.join("file:///bar", "foo", "hi"),
          "file:///bar/foo/hi",
      )
      # empty path element
      self.assertEqual(
          fs.join("file:///bar", "", "hi"),
          "file:///bar/hi",
      )
      # relative with protocol
      self.assertEqual(
          fs.join("file://bar", "foo"),
          "file://bar/foo",
      )
      # chained relative with protocol
      self.assertEqual(
          fs.join("simplecache::file://bucket/some/path", "bar"),
          "simplecache::file://bucket/some/path/bar",
      )
      # chained absolute without protocol
      self.assertEqual(
          fs.join("simplecache::/some/path", "bar"),
          "simplecache::/some/path/bar",
      )
      # absolute second part
      self.assertEqual(
          fs.join("simplecache::/some/path", "/bar"),
          "simplecache::/bar",
      )
      # absolute second part with protocol
      self.assertEqual(
          fs.join("simplecache::file:///some/path", "/bar"),
          "simplecache::file:///bar",
      )
      # trailing /
      self.assertEqual(
          fs.join("simplecache::/some/path/", "bar/", "foo"),
          "simplecache::/some/path/bar/foo",
      )
      # Trailing slash on the last element
      self.assertEqual(
          fs.join("hello", "world/"),
          "hello/world/",
      )
      # empty path at the end
      self.assertEqual(
          fs.join("hello", "world", ""),
          "hello/world/",
      )
      # absolute path in the middle
      self.assertEqual(
          fs.join("hello", "", "world", "", "/wow"),
          "/wow",
      )
  
imports: import posixpath
  from tensorboard import test
  from tensorboard.compat.tensorflow_stub import errors
  from tensorboard.compat.tensorflow_stub.io import gfile
  import fsspec
label_desc: Use image node_id 23 for calling the GFileFSSpecTest obj's underlying member method code with example usage: obj.testJoin() without return types