Update tox config

Author: wsanchez

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 
 envlist =
-    flake8
+    flake8, mypy
     test-py{26,27,34,35,36,37,38,py,py3}
     coverage_report
     packaging
@@ -54,6 +54,8 @@ passenv =
 setenv =
     PY_MODULE=hyperlink
 
+    test: PYTHONPYCACHEPREFIX={envtmpdir}/pycache
+
     test: COVERAGE_FILE={toxworkdir}/coverage.{envname}
     {coverage_report,codecov}: COVERAGE_FILE={toxworkdir}/coverage
     codecov: COVERAGE_XML={envlogdir}/coverage_report.xml
@@ -74,16 +76,15 @@ basepython = python3.8
 
 skip_install = True
 
-# Pin pydocstyle to version 3: see https://gitlab.com/pycqa/flake8-docstrings/issues/36
 deps =
     flake8-bugbear==19.8.0
-    #flake8-docstrings==1.4.0
-    #flake8-import-order==0.18.1
-    #flake8-pep3101==1.2.1
+    #flake8-docstrings==1.5.0
     flake8==3.7.9
     mccabe==0.6.1
     pep8-naming==0.9.1
     pydocstyle==4.0.1
+    # pin pyflakes pending a release with https://github.com/PyCQA/pyflakes/pull/455
+    git+git://github.com/PyCQA/pyflakes@ffe9386#egg=pyflakes
 
 commands =
     flake8 {posargs:src/{env:PY_MODULE}}
@@ -139,11 +140,9 @@ basepython = python3.8
 
 skip_install = True
 
-
 deps =
     mypy==0.740
 
-
 commands =
     mypy                                       \
         --config-file="{toxinidir}/tox.ini"    \
@@ -171,7 +170,7 @@ warn_unused_ignores      = True
 # Enable these over time
 check_untyped_defs       = False
 
-# Disable some checks until effected files fully adopt mypy
+# Don't complain about dependencies known to lack type hints
 
 [mypy-hyperlink._url]
 allow_untyped_defs = True
@@ -197,8 +196,8 @@ deps =
 
 commands =
     coverage combine
-    coverage report
-    coverage html
+    - coverage report
+    - coverage html
 
 
 ##
@@ -218,13 +217,17 @@ deps =
     codecov==2.0.15
 
 commands =
+    # Note documentation for CI variables in default environment's passenv
+
     coverage combine
     coverage xml -o "{env:COVERAGE_XML}"
-    codecov --file="{env:COVERAGE_XML}" --env \
-        GITHUB_REF GITHUB_COMMIT GITHUB_USER GITHUB_WORKFLOW \
-        TRAVIS_BRANCH TRAVIS_BUILD_WEB_URL TRAVIS_COMMIT TRAVIS_COMMIT_MESSAGE \
-        APPVEYOR_REPO_BRANCH APPVEYOR_REPO_COMMIT \
-        APPVEYOR_REPO_COMMIT_AUTHOR_EMAIL APPVEYOR_REPO_COMMIT_MESSAGE_EXTENDED
+    codecov --file="{env:COVERAGE_XML}" --env                 \
+        GITHUB_REF GITHUB_COMMIT GITHUB_USER GITHUB_WORKFLOW  \
+        TRAVIS_BRANCH TRAVIS_BUILD_WEB_URL                    \
+        TRAVIS_COMMIT TRAVIS_COMMIT_MESSAGE                   \
+        APPVEYOR_REPO_BRANCH APPVEYOR_REPO_COMMIT             \
+        APPVEYOR_REPO_COMMIT_AUTHOR_EMAIL                     \
+        APPVEYOR_REPO_COMMIT_MESSAGE_EXTENDED
 
 
 ##
@@ -240,7 +243,9 @@ basepython = python
 deps =
    check-manifest==0.40
    readme_renderer==24.0
+   twine==2.0.0
 
 commands =
    check-manifest
-   python setup.py check --metadata --restructuredtext --strict
+   pip wheel --wheel-dir "{envtmpdir}/dist" --no-deps {toxinidir}
+   twine check "{envtmpdir}/dist/"*