adding pytest to the windows env

Author: djarecka

.azure-pipelines/windows.yml

@@ -29,17 +29,17 @@ jobs:
       displayName: 'Update build tools'
     - script: |
         python -m pip install --find-links %EXTRA_WHEELS% %DEPENDS%
-        python -m pip install nose mock coverage codecov
       displayName: 'Install dependencies'
     - script: |
-        python -m pip install .
+        python -m pip install .[test]
         SET NIBABEL_DATA_DIR=%CD%\\nibabel-data
       displayName: 'Install nibabel'
     - script: |
         mkdir for_testing
         cd for_testing
         cp ../.coveragerc .
         nosetests --with-doctest --with-coverage --cover-package nibabel nibabel
+        pytest -v nibabel/tests/test_affines.py
       displayName: 'Nose tests'
     - script: |
         cd for_testing