Fix for circleci + virtualenv + pytest + tox

(Similar issue here: tox-dev/tox#373 (comment))

circle.yml

@@ -3,11 +3,12 @@ machine:
     version: 8.3
   pre:
     # from https://discuss.circleci.com/t/virtualenv-error-on-osx-build/387/2
-    - sudo -H pip install --upgrade virtualenv
+    # Let's use a known sane python and not the system python (that we need to use sudo with)
+    - brew install python
+    - pip install --upgrade virtualenv
 dependencies:
   override:
     - brew install libyaml
-    - brew install python
     - brew install python3
     - pip install -r requirements_test.txt
 compile:

pytest.ini

@@ -1,3 +1,5 @@
 [pytest]
 #addopts = --doctest-modules --ignore setup.py --cov=punic --cov-report html
 addopts = --doctest-modules --ignore setup.py
+# Needed due to the way circleci sets up python virtual environments.
+norecursedirs = dist build .tox venv

tox.ini

@@ -15,3 +15,5 @@ deps =
 # TERM is also needed.
 #passenv = TERM LC_ALL LANG
 passenv = *
+
+usedevelop = True