code: def test_repr(self):
      x = provider.BlobReference(url="foo", blob_key="baz")
      repr_ = repr(x)
      self.assertIn(repr(x.url), repr_)
      self.assertIn(repr(x.blob_key), repr_)
  
imports: import numpy
  from tensorboard import test
  from tensorboard.data import provider
label_desc: Use image node_id 1 for calling the BlobReferenceTest obj's underlying member method code with example usage: obj.test_repr() without return types