Add Github CI on Mac

.github/workflows/test-osx.yml

@@ -0,0 +1,23 b''
+name: Run tests
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: macos-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.7
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.7
+    - name: Install and update Python dependencies
+      run: |
+        python -m pip install --upgrade pip setuptools wheel
+        python -m pip install --upgrade -e file://$PWD#egg=ipython[test]
+        python -m pip install --upgrade --upgrade-strategy eager trio curio
+        python -m pip install --upgrade pytest pytest-trio 'matplotlib!=3.2.0'
+        python -m pip install --upgrade anyio
+    - name: pytest
+      run: pytest

.github/workflows/test.yml

@@ -1,36 +1,36 b''
 name: Run tests
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   test:
     runs-on: ubuntu-latest
     strategy:
       matrix:
         python-version: [3.7, 3.8, 3.9]
 
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install and update Python dependencies
       run: |
         python -m pip install --upgrade pip setuptools wheel
         python -m pip install --upgrade -e file://$PWD#egg=ipython[test]
         python -m pip install --upgrade --upgrade-strategy eager trio curio 
         python -m pip install --upgrade pytest pytest-trio 'matplotlib!=3.2.0'
         python -m pip install --upgrade check-manifest pytest-cov anyio
     - name: Check manifest
       run: check-manifest
     - name: iptest
       run: |
         cd /tmp && iptest --coverage xml && cd -
         cp /tmp/ipy_coverage.xml ./
         cp /tmp/.coverage ./
     - name: pytest
       run: |
         pytest
     - name: Upload coverage to Codecov
       uses: codecov/codecov-action@v1