Run pytest on macos in GH actions

.github/workflows/tests.yml

@@ -15,13 +15,36 @@ on:
 
 jobs:
   pytest:
-    name: Python ${{ matrix.python-version }}
+    name: pytest
 
-    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false  # false: try to complete all jobs
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        name:
+          - linux python-3.8
+          - linux python-3.9
+          - linux python-3.10
+          - linux python-3.11
+          - macos python-3.11
+
+        include:
+          - name: linux python-3.8
+            os: ubuntu-20.04
+            python-version: 3.8
+          - name: linux python-3.9
+            os: ubuntu-20.04
+            python-version: 3.9
+          - name: linux python-3.10
+            os: ubuntu-20.04
+            python-version: '3.10'
+          - name: linux python-3.11
+            os: ubuntu-20.04
+            python-version: 3.11
+          - name: macos python-3.11
+            os: macos-14
+            python-version: 3.11
+
+    runs-on: ${{ matrix.os }}
 
     steps:
       - uses: actions/checkout@v4
@@ -32,21 +55,37 @@ jobs:
           python-version: ${{ matrix.python-version }}
           cache: 'pip'
 
-      - name: Refresh package lists
+      - name: Refresh package lists and install Loki dependencies
         run: |
-          sudo apt-get -o Acquire::Retries=3 update || true
+          if [[ "${{ matrix.os }}" =~ macos ]]; then
+            brew install gcc@13 graphviz
+          else
+            sudo apt-get -o Acquire::Retries=3 update || true
+            sudo apt-get -o Acquire::Retries=3 install -y graphviz gfortran
+          fi
+
+      - name: Install OMNI + CLAW dependencies on Linux
+        if: ${{ ! startsWith(matrix.os, 'macos') }}
+        run: |
+          sudo apt-get -o Acquire::Retries=3 install -y byacc flex openjdk-11-jdk cmake ant
 
-      - name: Install Loki dependencies
+      - name: Install Loki on Linux
+        if: ${{ ! startsWith(matrix.os, 'macos') }}
         run: |
-          sudo apt-get -o Acquire::Retries=3 install -y graphviz gfortran
+          ./install --with-claw --with-ofp --with-examples --with-tests --with-dace
 
-      - name: Install OMNI + CLAW dependencies
+      - name: Install Loki on MacOS
+        if: ${{ startsWith(matrix.os, 'macos') }}
         run: |
-          sudo apt-get -o Acquire::Retries=3 install -y byacc flex openjdk-11-jdk cmake ant
+          export CC=gcc-13 CXX=g++-13 FC=gfortran-13 F90=gfortran-13
+          ./install --with-examples --with-tests
 
-      - name: Install Loki
+      - name: Add GNU compiler to environment on MacOS
+        if: ${{ startsWith(matrix.os, 'macos') }}
         run: |
-          ./install --with-claw --with-ofp --with-examples --with-tests --with-dace
+          echo "export PATH=/opt/homebrew/bin:\${PATH}" >> loki-activate
+          echo "export CC=gcc-13 FC=gfortran-13 F90=gfortran-13" >> loki-activate
+          cat loki-activate
 
       - name: Install up-to-date CMake
         run: |
@@ -60,6 +99,7 @@ jobs:
 
       - name: Upload loki coverage report to Codecov
         uses: codecov/codecov-action@v4
+        if: ${{ ! startsWith(matrix.os, 'macos') }}
         with:
           flags: loki
           files: ./coverage.xml
@@ -73,6 +113,7 @@ jobs:
 
       - name: Upload transformations coverage report to Codecov
         uses: codecov/codecov-action@v4
+        if: ${{ ! startsWith(matrix.os, 'macos') }}
         with:
           flags: transformations
           files: ./coverage.xml
@@ -86,6 +127,7 @@ jobs:
 
       - name: Upload lint_rules coverage report to Codecov
         uses: codecov/codecov-action@v4
+        if: ${{ ! startsWith(matrix.os, 'macos') }}
         with:
           flags: lint_rules
           files: ./coverage.xml