Add xarray groupby test

.github/workflows/ci.yaml

@@ -97,3 +97,46 @@ jobs:
         shell: bash -l {0}
         run: |
           pytest -n 2
+
+  xarray-groupby:
+    name: xarray-groupby
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash -l {0}
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          repository: 'pydata/xarray'
+          fetch-depth: 0 # Fetch all history for all branches and tags.
+      - name: Set up conda environment
+        uses: mamba-org/provision-with-micromamba@de032af7fb3675649f3d4bbdda85178ba412ee41
+        with:
+          environment-file: ci/requirements/environment.yml
+          environment-name: xarray-tests
+          extra-specs: |
+            python="3.10"
+      - name: Install xarray
+        run: |
+          python -m pip install --no-deps .
+      - name: Install upstream flox
+        run: |
+          python -m pip install --no-deps \
+            git+https://github.com/dcherian/flox.git@${{ github.ref }}
+      - name: Version info
+        run: |
+          conda info -a
+          conda list
+          python xarray/util/print_versions.py
+      - name: import xarray
+        run: |
+          python -c 'import xarray'
+      - name: import flox
+        run: |
+          python -c 'import flox'
+      - name: Run Tests
+        if: success()
+        id: status
+        run: |
+          set -euo pipefail
+          python -m pytest -n auto xarray/tests/test_groupby.py