Test on MacOS in CI

.github/workflows/ci.yml

@@ -1,10 +1,10 @@
 name: CI
+on: [push]
 
-on:
- pull_request:
- push:
-   branches:
-    - main
+# Automatically stop old builds on the same branch/PR
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 
 defaults:
   run:
@@ -24,7 +24,7 @@ jobs:
       - name: Run pre-commit checks
         uses: pre-commit/[email protected]
 
-  tests:
+  tests-linux:
     name: "Linux - unit tests - Python ${{ matrix.PYTHON_VERSION }}"
     runs-on: ubuntu-latest
     env:
@@ -52,6 +52,34 @@ jobs:
           pip install .
           pytest
 
+  tests-macos:
+    name: "MacOS - unit tests - Python ${{ matrix.PYTHON_VERSION }}"
+    runs-on: macos-latest
+    env:
+      CI: True
+    strategy:
+      fail-fast: true
+      matrix:
+        PYTHON_VERSION: ['3.11']
+    steps:
+      - name: Checkout branch
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref }}
+      - uses: conda-incubator/setup-miniconda@v2
+        with:
+          python-version: ${{ matrix.PYTHON_VERSION }}
+          miniforge-variant: Mambaforge
+          miniforge-version: 4.11.0-2
+          use-mamba: true
+          environment-file: environment.yml
+          activate-environment: spox
+      - name: Run unit tests
+        shell: bash -l {0}
+        run: |
+          pip install .
+          pytest
+
   opset-generation:
     name: "Linux - opset generation - Python ${{ matrix.PYTHON_VERSION }}"
     runs-on: ubuntu-latest