Add CI jobs to test against cryptography wheels (#1049)

Author: njsmith

.github/workflows/ci.yml

@@ -30,6 +30,9 @@ jobs:
           - {VERSION: "3.9", TOXENV: "py39-cryptographyMinimum"}
           - {VERSION: "3.10", TOXENV: "py310-cryptographyMinimum"}
           - {VERSION: "pypy3", TOXENV: "pypy3-cryptographyMinimum"}
+          # Cryptography wheels
+          - {VERSION: "3.9", TOXENV: "py39-cryptographyMinimum-useWheel"}
+          - {VERSION: "3.9", TOXENV: "py39-useWheel"}
           # Random order
           - {VERSION: "3.9", TOXENV: "py39-randomorder"}
           # Downstreams

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = {pypy,pypy3,py27,py36,py37,py38,py39,py310}{,-cryptographyMain,-cryptographyMinimum}{,-randomorder},py37-twistedTrunk,pypi-readme,check-manifest,flake8,docs,coverage-report
+envlist = {pypy,pypy3,py27,py36,py37,py38,py39,py310}{,-cryptographyMain,-cryptographyMinimum}{,-useWheel}{,-randomorder},py37-twistedTrunk,pypi-readme,check-manifest,flake8,docs,coverage-report
 
 [testenv]
 whitelist_externals =
@@ -17,6 +17,7 @@ setenv =
     # with extra packages.
     PYTHONPATH=
     PIP_NO_BINARY=cryptography
+    useWheel: PIP_NO_BINARY=
 commands =
     openssl version
     coverage run --parallel -m OpenSSL.debug