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If we want to test for error cases, it can be useful to inspect the `stderr` of a `Command` to analyze the errors. For example, this allows us to ensure that a `Command` returns an `IoError` by parsing the error trace, if an `IoError` is expected. This commit prepares the implementation of negative integration tests for the configurable BDFs. Signed-off-by: Pascal Scholz <pascal.scholz@cyberus-technology.de> On-behalf-of: SAP pascal.scholz@sap.com