All warnings lead to failure in tests

[StephaneMangin]

Is your feature request related to a problem?
Yes, when we want to use the deprecated decorator to indicate an API change, this leads to a warning in logs leading to a test failure.

Describe the solution you'd like
Deprecated should be taken in account in the log analysis to avoid a failure.

Describe alternatives you've considered
The alternative is to log an info message which is not as visible and percusive as a warning.