There have been repeated examples with releases which pass tests in repo but have resulted in released artifacts to PyPI to and Homebrew with serious problems.

• Refactor the CLI integration tests to allow for optional testing against an external planemo command.
• Extend make release with some real testing. After publishing to test PyPI:
  • Create a temp virtualenv.
  • Install all dependencies
  • Install planemo from test pypi.
  • run release tests.