Use conda to install pydot on AppVeyor

pydot-ng needs a way to be tests on conda installation
since it is often used in science-related packages

Author: prmtl

appveyor.yml

@@ -1,7 +1,6 @@
 # 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
+# * https://gitlab.com/betse/betse/raw/master/appveyor.yml
 
 version: '{branch}-{build}'
 
@@ -19,43 +18,39 @@ 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"
+      MINICONDA_DIRNAME: "C:\\Miniconda"
 
     - JOB: "3.6 64-bit"
       TOXENV: "py36"
       PYTHON: "C:\\Python36-x64"
       PYTHON_ARCH: "64"
+      MINICONDA_DIRNAME: "C:\\Miniconda36-x64"
 
 init:
-  - "ECHO %TOXENV%"
+  - "ECHO %TOXENV% %PYTHON_VERSION% %MINICONDA_DIRNAME%"
 
 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%"
+  # Make sure that python and python-related scripts are run from miniconda-specific
+  # python installation
+  - cmd: set "PATH=%MINICONDA_DIRNAME%;%MINICONDA_DIRNAME%\\Scripts;%PATH%"
+  - cmd: conda config --set always_yes true
+  - cmd: conda info --all
 
-  # Check that we have the expected version and architecture for Python
-  - "python --version"
-  - "python -c \"import struct; print(struct.calcsize('P') * 8)\""
+  # Create and configure an empty Anaconda environment specific to this Python version.
+  - cmd: conda create --quiet --name conda-env-%PYTHON_VERSION% python=%PYTHON_VERSION%
+  - cmd: activate conda-env-%PYTHON_VERSION%
+  - cmd: conda config --add channels anaconda
+  - cmd: conda install --quiet --file requirements-conda.txt
+  - cmd: python setup.py develop
 
-   # 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-  # about it being out of date.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"
 
+# Tell AppVeyor this is not .NET project
 build: off
 
 test_script:
-  - tox
+  - py.test -vvv test

requirements-conda.txt

@@ -0,0 +1,4 @@
+graphviz >=2.38.0
+pyparsing >=2.0.1
+pytest ==3.8.2
+mock ==2.0.0