Add changelog entry and a comment on the unit test

Author: Ignacio Quintero

CHANGELOG.rst

@@ -8,6 +8,8 @@ CHANGELOG
 * bug-fix: Unit Tests: Improve unit test runtime
 * bug-fix: Estimators: Fix attach for LDA
 * bug-fix: Estimators: allow code_location to have no key prefix
+* bug-fix: Local Mode: Fix s3 training data download when there is a trailing slash
+
 
 1.4.1
 =====

tests/unit/test_image.py

@@ -368,6 +368,7 @@ def test_download_folder(makedirs):
     obj_mock.download_file.assert_has_calls(calls)
     obj_mock.reset_mock()
 
+    # Testing with a trailing slash for the prefix.
     sagemaker_container._download_folder(BUCKET_NAME, '/prefix/', '/tmp')
     obj_mock.download_file.assert_called()
     calls = [call(os.path.join('/tmp', 'train/train_data.csv')),