Merge Windows workflow with pytest workflow

Closes #4517

.github/workflows/pytest.yml

@@ -5,26 +5,29 @@ on:
   push:
     branches: [main]
 
+
+# Tests are split into multiple jobs to accelerate the CI.
+# Different jobs should be organized to take approximately the same
+# time to complete (and not be prohibitely slow).
+# Because GitHub Actions don't support YAML anchors, we have to place the
+# splitting of testfiles into groups in the strategy/matrix/test-subset
+# and can't re-use the groups across jobs.
+# A pre-commit hook (scripts/check_all_tests_are_covered.py)
+# enforces that test run just once per OS / floatX setting.
+
 jobs:
-  pytest:
+  ubuntu:
     strategy:
       matrix:
         os: [ubuntu-18.04]
         floatx: [float32, float64]
         test-subset:
-        # Tests are split into multiple jobs to accelerate the CI.
-        # Different jobs should be organized to take approximately the same
-        # time to complete (and not be prohibitely slow)
-        #
         # How this works:
         # 1st block: Only passes --ignore parameters to pytest.
         # → pytest will run all test_*.py files that are NOT ignored.
+        #
         # Subsequent blocks: Only pass paths to test files.
         # → pytest will run only these files
-        #
-        # Any test that was not ignored runs in the first job.
-        # A pre-commit hook (scripts/check_all_tests_are_covered.py)
-        # enforces that test run just once.
           - |
             --ignore=pymc3/tests/test_distributions_timeseries.py
             --ignore=pymc3/tests/test_mixture.py
@@ -128,3 +131,55 @@ jobs:
           env_vars: OS,PYTHON
           name: codecov-umbrella
           fail_ci_if_error: false
+  windows:
+    strategy:
+      matrix:
+        os: [windows-latest]
+        floatx: [float64]
+        test-subset:
+          - pymc3/tests/test_distributions_random.py
+          - pymc3/tests/test_sampling.py
+    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}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Cache conda
+        uses: actions/cache@v1
+        env:
+          # Increase this value to reset cache if conda-envs/environment-dev-py38.yml has not changed
+          CACHE_NUMBER: 0
+        with:
+          path: ~/conda_pkgs_dir
+          key: ${{ runner.os }}-conda-${{ env.CACHE_NUMBER }}-${{
+            hashFiles('conda-envs/windows-environment-dev-py38.yml') }}
+      - name: Cache multiple paths
+        uses: actions/cache@v2
+        env:
+          # Increase this value to reset cache if requirements.txt has not changed
+          CACHE_NUMBER: 0
+        with:
+          path: |
+            ~/.cache/pip
+            $RUNNER_TOOL_CACHE/Python/*
+            ~\AppData\Local\pip\Cache
+          key: ${{ runner.os }}-build-${{ matrix.python-version }}-${{
+            hashFiles('requirements.txt') }}
+      - uses: conda-incubator/setup-miniconda@v2
+        with:
+          activate-environment: pymc3-dev-py38
+          channel-priority: strict
+          environment-file: conda-envs/windows-environment-dev-py38.yml
+          use-only-tar-bz2: true # IMPORTANT: This needs to be set for caching to work properly!
+      - name: Install-pymc3
+        run: |
+          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

scripts/check_all_tests_are_covered.py

@@ -36,7 +36,7 @@ def from_yaml():
     """
     # First collect the matrix definitions from testing workflows
     matrices = {}
-    for wf in ["pytest.yml", "windows.yml", "arviz_compat.yml", "jaxtests.yml"]:
+    for wf in ["pytest.yml", "arviz_compat.yml", "jaxtests.yml"]:
         wfname = wf.strip(".yml")
         wfdef = yaml.safe_load(open(Path(".github", "workflows", wf)))
         for jobname, jobdef in wfdef["jobs"].items():