Right now, the repository-s3 plugin relies on tests that mocks the AmazonS3 client. However, this is a limited form of testing that does not bring to light issues one would find when interacting with the real Amazon SDK connecting to a real S3 repository. Such tests are essential in uncovering even basic issues of interaction between our integration and the Amazon SDK. As an example, see #20861 which would have been uncovered with such tests.