use conda environments

appveyor.yml

@@ -6,15 +6,14 @@ environment:
    PYTHON_ARCH: "64"
    MINICONDA: "latest"
    CONDA_CHANNELS: "conda-forge msys2"
-   CONDA_DEPENDENCIES: "libpython"
 
  matrix:
   - PYTHON_VERSION: "2.7"
-    CONDA_DEPENDENCIES: "mingw"
+    CONDA_DEPENDENCIES: "libpython mingw"
   - PYTHON_VERSION: "3.5"
-    CONDA_DEPENDENCIES: "m2w64-toolchain"
+    CONDA_DEPENDENCIES: "libpython m2w64-toolchain"
   - PYTHON_VERSION: "3.6"
-    CONDA_DEPENDENCIES: "m2w64-toolchain"
+    CONDA_DEPENDENCIES: "libpython m2w64-toolchain"
 
 version: '{build}'
 platform:
@@ -24,19 +23,21 @@ install:
 - "git clone git://github.com/astropy/ci-helpers.git"
 - "powershell ci-helpers/appveyor/install-miniconda.ps1"
 - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
+- "conda create -q -n test-environment python=%PYTHON_VERSION% %CONDA_DEPENDENCIES%"
+- activate test-environment
 - pip install -r requirements.txt
 - pip install -r requirements-dev.txt
 - pip install codecov
 
 build_script:
- - "%CMD_IN_ENV% python setup.py build_ext --inplace"
+ - python setup.py build_ext --inplace
 
 test_script:
- - "%CMD_IN_ENV% pytest --cov=neuroglia"
+ - pytest --cov=neuroglia
  - codecov
 
 after_test:
- - "%CMD_IN_ENV% python setup.py sdist bdist_wheel"
+ - python setup.py sdist bdist_wheel
 
 artifacts:
  - path: dist\*.whl