Add scripts for downstream testing

RELEASING.rst

@@ -1,6 +1,10 @@
 Release Procedure
 -----------------
 
+#. Dependening on the magnitude of the changes in the release, consider testing
+   some of the large downstream users of pluggy against the upcoming release.
+   You can do so using the scripts in the ``downstream/`` directory.
+
 #. From a clean work tree, execute::
 
     tox -e release -- VERSION

downstream/.gitignore

@@ -0,0 +1,6 @@
+/conda/
+/datasette/
+/devpi/
+/hatch/
+/pytest/
+/tox/

downstream/README.md

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+This directory contains scripts for testing some downstream projects
+against your current pluggy worktree.

downstream/conda.sh

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+#!/usr/bin/env bash
+set -eux -o pipefail
+if [[ ! -d conda ]]; then
+    git clone https://github.com/conda/conda
+fi
+pushd conda && trap popd EXIT
+git pull
+set +eu
+source dev/start
+set -eu
+pip install -e ../../
+pytest -m "not integration and not installed"

downstream/datasette.sh

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+#!/usr/bin/env bash
+set -eux -o pipefail
+if [[ ! -d datasette ]]; then
+    git clone https://github.com/simonw/datasette
+fi
+pushd datasette && trap popd EXIT
+git pull
+python -m venv venv
+venv/bin/pip install -e .[test] -e ../..
+venv/bin/pytest

downstream/devpi.sh

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+#!/usr/bin/env bash
+set -eux -o pipefail
+if [[ ! -d devpi ]]; then
+    git clone https://github.com/devpi/devpi
+fi
+pushd devpi && trap popd EXIT
+git pull
+python -m venv venv
+venv/bin/pip install -r dev-requirements.txt -e ../..
+venv/bin/pytest common
+venv/bin/pytest server
+venv/bin/pytest client
+venv/bin/pytest web

downstream/hatch.sh

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+#!/usr/bin/env bash
+set -eux -o pipefail
+if [[ ! -d hatch ]]; then
+    git clone https://github.com/pypa/hatch
+fi
+pushd hatch && trap popd EXIT
+git pull
+python -m venv venv
+venv/bin/pip install -e . -e ./backend  -e ../..
+venv/bin/hatch run dev

downstream/pytest.sh

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+#!/usr/bin/env bash
+set -eux -o pipefail
+if [[ ! -d pytest ]]; then
+    git clone https://github.com/pytest-dev/pytest
+fi
+pushd pytest && trap popd EXIT
+git pull
+python -m venv venv
+venv/bin/pip install -e .[testing] -e ../..
+venv/bin/pytest

downstream/tox.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+set -eux -o pipefail
+if [[ ! -d tox ]]; then
+    git clone https://github.com/tox-dev/tox
+fi
+pushd tox && trap popd EXIT
+python -m venv venv
+venv/bin/pip install -e .[testing] -e ../..
+venv/bin/pytest