CI: Install test requirements through extra dependencies

Author: effigies

.azure-pipelines/windows.yml

@@ -30,7 +30,6 @@ jobs:
       displayName: 'Update build tools'
     - script: |
         python -m pip install --find-links %EXTRA_WHEELS% %DEPENDS%
-        python -m pip install nose coverage codecov pytest pytest-cov
       displayName: 'Install dependencies'
     - script: |
         python -m pip install .[$(CHECK_TYPE)]
@@ -44,6 +43,7 @@ jobs:
       displayName: 'Pytest tests'
       condition: and(succeeded(), eq(variables['CHECK_TYPE'], 'test'))
     - script: |
+        python -m pip install codecov
         cd for_testing
         codecov
       displayName: 'Upload To Codecov'