Fix the unittests

Author: shunjd

tests/unit/test_sagemaker_steps.py

@@ -51,6 +51,10 @@ def pca_estimator():
  mini_batch_size=200
  )
 
+ pca.sagemaker_session = MagicMock()
+ pca.sagemaker_session.boto_region_name = 'us-east-1'
+ pca.sagemaker_session._default_bucket = 'sagemaker'
+
  return pca
 
 @pytest.fixture