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As it looks like pytest 2.8.0 is causing some issues with our usage of
pytest.deprecated_call()
in Python unit tests, this commit is forcing an earlier version of pytest to be installed on Travis rather than downloading the latest.To test this PR, check Travis is green. Note this PR is mostly targeted at keeping our PR validation via Travis ongoing. The reason of the regression should likely be investigated as a follow-up.
/cc @ximenesuk @aleksandra-tarkowska @will-moore @jburel