Run more Windows tests and use cmd shell

But don't run tests_distributions.py on Windows because it runs into aesara-devs/aesara#485

Author: michaelosthege

.github/workflows/pytest.yml

@@ -135,17 +135,30 @@ jobs:
     strategy:
       matrix:
         os: [windows-latest]
-        floatx: [float64]
+        floatx: [float32, float64]
         test-subset:
-          - pymc3/tests/test_distributions_random.py
-          - pymc3/tests/test_sampling.py
+          - |
+            pymc3/tests/test_distributions_random.py
+          - |
+            pymc3/tests/test_sampling.py
+            pymc3/tests/test_shared.py
+          - |
+            pymc3/tests/test_gp.py
+            pymc3/tests/test_ode.py
+          - |
+            pymc3/tests/test_model.py
+            pymc3/tests/test_model_func.py
+            pymc3/tests/test_modelcontext.py
+            pymc3/tests/test_pickling.py
+
+      fail-fast: false
     runs-on: ${{ matrix.os }}
     env:
       TEST_SUBSET: ${{ matrix.test-subset }}
       AESARA_FLAGS: floatX=${{ matrix.floatx }},gcc__cxxflags='-march=core2'
     defaults:
       run:
-        shell: bash -l {0}
+        shell: cmd
     steps:
       - uses: actions/checkout@v2
       - name: Cache conda
@@ -180,6 +193,9 @@ jobs:
           conda activate pymc3-dev-py38
           pip install -e .
           python --version
-      - run: |
-          conda activate pymc3-dev-py38
-          python -m pytest -vv --cov=pymc3 --cov-report=xml --cov-report term --durations=50 $TEST_SUBSET
+      - name: Run tests
+        # This job uses a cmd shell, therefore the environment variable syntax is different!
+        # The ">-" in the next line replaces newlines with spaces (see https://stackoverflow.com/a/66809682).
+        run: >-
+          conda activate pymc3-dev-py38 &&
+          python -m pytest -vv --cov=pymc3 --cov-report=xml --cov-report term --durations=50 %TEST_SUBSET%