Add `type` validation.

minor: fix grammar with help for --setup-{only,show}

Improved description of functionality for Issue pytest-dev#687

This code leaves None in sys.modules as a side effect but is no longer needed in the Python 3 versions we support.

Fix pytest-dev#2103

Remove support code for earlier Python 3 version in Source.compile

Add warning for incorrect passing args to `-o`.

pytest would emit false positive warnings about assertion-rewrite when a
module appears multiple times in plugins which depend
on other plugins using the 'pytest_plugins' mechanism

…test-plugins

Fix false-positive assert rewrite warnings when using 'pytest_plugins'

Fix pytest-dev#2016

Remove hook proxy cache

Fix minor typo

…st.approx In Python 2

Fix pytest-dev#2111

Use a simple ``+-`` ASCII string in the string representation of pytest.approx In Python 2

Release 3.0.5

Fix pytest-dev#721

Also update yield teardown for Issue pytest-dev#687

Add release dates to CHANGELOG entries

This avoids having to resort to skipping modules in conftest.py file and avoids flake8 errors

…ging (#8)

Setuptools is used in `_pytest/config.py` but was not explicitly listed as requirement. This led to an error when creating a Conda package for pytest since setuptools is not necessarily installed by default in Conda envs.

The error message contains the expected type of warnings and the
warnings that were captured. Add tests.

following contribution guidelines

Mention that Python also adds CWD to sys.path using python -m

Fix fixture/parametrize override example.

…nfo-when-warns-fail

Improve error message when pytest.warns fail

While I agree this is *far* from ideal, IMHO It is better to ignore them for now otherwise we hamper contributors with unrelated errors.

We should fix this before the next release.

pytest-dev#1989

…ains ::.

This commit also improves readbility in get_dirs_from_args by using self
documenting local functions.

get_dirs_from_args also now only returns directories that actually exists,
and not files to avoid confusion.

This commit also removes redundant checks in get_common_ancestor that
was already performed in get_dirs_from_args..

Those tests originally checked for ImportError. Since Python 3.6
ModuleNotFoundError is raised in this context instead, the tests didn't work
as they are text based (so exception inheritance does not save the day).

Fixes pytest-dev#2132

Partial fix for pytest-dev#2134

Fix handling of ini configuration in subdirs when specifying ::

Allow trial environments to fail on CI for now

Explicitly add setuptools to install_requires

Use inspect to properly detect generators. Fixes pytest-dev#2129

Tests: Check for ModuleNotFoundError on Python 3.6+