AppVeyor integration

Author: prmtl

appveyor.yml

@@ -0,0 +1,61 @@
+# Appveyor, continuous integration for Windows
+# Most of the config comes from:
+# * https://github.com/nedbat/coveragepy/blob/master/appveyor.yml
+# * https://github.com/ogrisel/python-appveyor-demo/blob/master/appveyor.yml
+
+version: '{branch}-{build}'
+
+shallow_clone: true
+
+cache:
+  - '%LOCALAPPDATA%\pip\Cache'
+
+branches:
+  only:
+  - master
+
+# Do not build feature branch with open Pull Requests
+skip_branch_with_pr: true
+
+environment:
+
+  CMD_IN_ENV: "cmd /E:ON /V:ON /C .\\ci\\run_with_env.cmd"
+
+  # Parallel pytest gets tangled up with tests that try to create and destroy
+  # .pth files in the shared virtualenv. Disable parallel tests.
+  PYTEST_ADDOPTS: "-n 0"
+
+  matrix:
+    - JOB: "2.7 32-bit"
+      TOXENV: "py27"
+      PYTHON: "C:\\Python27.11"
+      PYTHON_ARCH: "32"
+
+    - JOB: "3.6 64-bit"
+      TOXENV: "py36"
+      PYTHON: "C:\\Python36-x64"
+      PYTHON_ARCH: "64"
+
+init:
+  - "ECHO %TOXENV%"
+
+install:
+  - cinst graphviz
+  # Prepend Python to the PATH of this build (this cannot be
+  # done from inside the powershell script as it would require to restart
+  # the parent CMD process).
+  - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
+
+  # Check that we have the expected version and architecture for Python
+  - "python --version"
+  - "python -c \"import struct; print(struct.calcsize('P') * 8)\""
+
+   # Upgrade to the latest version of pip to avoid it displaying warnings
+  # about it being out of date.
+  - "python -m pip install --upgrade pip"
+  - "python -m pip install --upgrade tox"
+
+build: off
+
+test_script:
+  - tox