The cling tests appear to hang on OSX

.github/workflows/main.yml

@@ -11,13 +11,14 @@ on:
   - cron: "0 2 * * 1-5"  # run on weekdays at 2:00am UTC
 
 jobs:
-  run:
+  test-linux:
+
     runs-on: ${{ matrix.os }}
 
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-10.15]
+        os: [ubuntu-latest]
         python_version: ['3.7', '3.8', '3.9', '3.10']
 
     steps:
@@ -59,6 +60,51 @@ jobs:
       run: |
         python -m flake8 voila tests setup.py
 
+
+  test-osx:
+
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-10.15]
+        python_version: ['3.7', '3.8', '3.9', '3.10']
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Setup mamba
+      uses: conda-incubator/setup-miniconda@v2
+      with:
+        mamba-version: "*"
+        channels: conda-forge
+
+    - name: Create the conda environment
+      shell: bash -l {0}
+      run: mamba install -q python=${{ matrix.python_version }} pip jupyterlab_pygments==0.1.0 pytest-cov pytest-rerunfailures nodejs yarn flake8 ipywidgets matplotlib xeus-cling openssl=1.1.1l "traitlets>=5.0.3,<6"
+
+    - name: Install dependencies
+      shell: bash -l {0}
+      run: |
+        whereis python
+        python --version
+        yarn install --network-timeout 100000
+        python -m pip install ".[test]"
+        (cd tests/test_template; pip install .)
+        (cd tests/skip_template; pip install .)
+
+    - name: Run tests
+      shell: bash -l {0}
+      run: |
+        py.test tests/ --async-test-timeout=240 --reruns 2 --reruns-delay 1
+        voila --help  # Making sure we can run `voila --help`
+        # tests if voila sends a 'heartbeat' to avoid proxies from closing an apparently stale connection
+        # Note that wget is the only easily available software that has a read-timeout
+        voila tests/notebooks/sleep10seconds.ipynb --port=8878 --VoilaConfiguration.http_keep_alive_timeout=2 &
+        sleep 2
+        wget --read-timeout=5 --tries=1 http://localhost:8878
+
   test-win:
 
     runs-on: ${{ matrix.os }}