add coverage.yml

Author: bobmyhill

.github/workflows/coverage.yml

@@ -0,0 +1,45 @@
+name: CodeCoverage
+
+on: [push, pull_request, workflow_dispatch]
+
+jobs:  
+  run:
+    runs-on: [ubuntu-24.04]
+
+    strategy:
+      matrix:
+        python-versions: ['3.12']
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-versions }}
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-versions }}
+    - name: setup
+      run: |
+        sudo apt update && sudo apt install --yes \
+         libcdd-dev \
+         libgmp-dev \
+         numdiff \
+         texlive \
+         texlive-latex-extra
+        python -m pip install --upgrade pip
+        pip install pycddlib autograd # this is optional
+        pip install coverage
+        python --version
+    - name: Generate Report
+      run: |
+        python -m pip install git+https://github.com/geodynamics/burnman@main
+        coverage run -m unittest discover ./tests
+        main_coverage=$(coverage report --precision=7 --format=total)
+        python -m pip install -q -e .[dev]
+        coverage run -m unittest discover ./tests
+        coverage report
+        new_coverage=$(coverage report --precision=7 --format=total)
+        echo "Main coverage: $main_coverage"
+        echo "New coverage: $new_coverage"
+        if (( $(echo "$new_coverage < $main_coverage" | bc -l) )); then
+          echo "Coverage decreased relative to main"
+          exit 1
+        fi