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Mention other platforms in 'pytest/pytest-cov not found' warning #337

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christophebedard
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Relates to #274

Signed-off-by: Christophe Bedard bedard.christophe@gmail.com

Signed-off-by: Christophe Bedard <bedard.christophe@gmail.com>
Comment on lines 78 to 80
"The Python module 'pytest' was not found, pytests cannot be run. "
"On Ubuntu/Debian, install the 'python3-pytest' package. "
"On other platforms, install 'pytest' using pip.")
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I wonder if it makes more sense to just point to the generic installation docs instead. That is, something like:

      "The Python module 'pytest' was not found, pytests cannot be run. "
      "See https://docs.ros.org/en/rolling/Installation.html to install pytest for your platform.")

This has the downside that we are embedding a rolling URL in the code, but it avoids duplicating the install instructions. Thoughts?

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it would make sense for pytest because it is part of a normal ROS 2 installation (however, pytest-cov isn't), but besides embedding rolling in the URL, I kind of prefer the current warning messages because they tell you exactly what you need to do (install ___ package) instead of pointing you to the generic installation docs just to install a Python package or two.

In any case, I can switch to that for pytest if you prefer.

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another thing: should ament really link to ROS 2 like that? As opposed to the other way around, ROS 2 linking to ament.

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I kind of prefer the current warning messages because they tell you exactly what you need to do (install ___ package) instead of pointing you to the generic installation docs just to install a Python package or two.

Yeah, that's true.

another thing: should ament really link to ROS 2 like that? As opposed to the other way around, ROS 2 linking to ament.

In theory, no. In practice, it seems unlikely that anyone outside the ROS 2 ecosystem is using ament (at least, I don't know of any). It would be nice to be proven wrong, though :).

Overall, I agree with you about keeping the current message. The one thing I would say is let's change the message to say "On Linux, install the 'python3-pytest' package", since that will also cover RHEL/Fedora.

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In theory, no. In practice, it seems unlikely that anyone outside the ROS 2 ecosystem is using ament (at least, I don't know of any). It would be nice to be proven wrong, though :).

maybe one day! 😄

Overall, I agree with you about keeping the current message. The one thing I would say is let's change the message to say "On Linux, install the 'python3-pytest' package", since that will also cover RHEL/Fedora.

done: 0752f31

Signed-off-by: Christophe Bedard <bedard.christophe@gmail.com>
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@clalancette clalancette left a comment

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Looks good to me!

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CI (just to ensure that we don't have tests looking for an exact string):

  • Linux Build Status
  • Linux-aarch64 Build Status
  • macOS Build Status
  • Windows Build Status

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Looks good, going ahead and merging. Thanks for the contribution!

@clalancette clalancette merged commit 6a24f75 into ament:master May 11, 2021
@christophebedard christophebedard deleted the mention-other-platforms-in-pytest-pytest-cov-message branch May 11, 2021 20:30
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2 participants