Add workaround for unreleased PyNaCl

.github/workflows/main.yml

@@ -81,6 +81,10 @@ jobs:
           echo "PRE_BUILT_SETUPTOOLS_SDIST=$(ls dist/*.tar.gz)" >> $GITHUB_ENV
           echo "PRE_BUILT_SETUPTOOLS_WHEEL=$(ls dist/*.whl)" >> $GITHUB_ENV
           rm -rf setuptools.egg-info  # Avoid interfering with the other tests
+      - name: Workaround for unreleased PyNaCl (pyca/pynacl#805)
+        if: contains(matrix.python, 'pypy')
+        shell: bash
+        run: echo "SETUPTOOLS_ENFORCE_DEPRECATION=0" >> $GITHUB_ENV
       - name: Install tox
         run: |
           python -m pip install tox

tox.ini

@@ -6,14 +6,15 @@ deps =
 	# ^-- use dev version while we wait for the new release
 setenv =
 	PYTHONWARNDEFAULTENCODING = 1
-	SETUPTOOLS_ENFORCE_DEPRECATION = 1
+	SETUPTOOLS_ENFORCE_DEPRECATION = {env:SETUPTOOLS_ENFORCE_DEPRECATION:1}
 commands =
 	pytest {posargs}
 usedevelop = True
 extras =
 	testing
 pass_env =
 	SETUPTOOLS_USE_DISTUTILS
+	SETUPTOOLS_ENFORCE_DEPRECATION
 	PRE_BUILT_SETUPTOOLS_WHEEL
 	PRE_BUILT_SETUPTOOLS_SDIST
 	TIMEOUT_BACKEND_TEST  # timeout (in seconds) for test_build_meta