4.2.1

pytest 4.2.1 (2019-02-12)

Bug Fixes

• #2895: The
  pytest_report_collectionfinish hook now is also called with
  --collect-only.
• #3899: Do not
  raise UsageError when an imported package has a
  pytest_plugins.py child module.
• #4347: Fix
  output capturing when using pdb++ with recursive debugging.
• #4592: Fix
  handling of collect_ignore via parent conftest.py.
• #4700: Fix
  regression where setUpClass would always be called in subclasses
  even if all tests were skipped by a unittest.skip() decorator
  applied in the subclass.
• #4739: Fix
  parametrize(... ids=<function>) when the function returns
  non-strings.
• #4745:
  Fix/improve collection of args when passing in __init__.py and a
  test file.
• #4770:
  more_itertools is now constrained to <6.0.0 when required for
  Python 2.7 compatibility.
• #526: Fix
  "ValueError: Plugin already registered" exceptions when running in
  build directories that symlink to actual source.

Improved Documentation

• #3899: Add note
  to plugins.rst that pytest_plugins should not be used as a name
  for a user module containing plugins.
• #4324: Document
  how to use raises and does_not_raise to write parametrized tests
  with conditional raises.
• #4709: Document
  how to customize test failure messages when using pytest.warns.

Trivial/Internal Changes

• #4741: Some
  verbosity related attributes of the TerminalReporter plugin are now
  read only properties.