Reliably enable code coverage reporting

.coveragerc

@@ -3,6 +3,13 @@
 
 [run]
 branch = True
-source = spreadflow_xslt
+source_pkgs =
+    spreadflow_xslt
 omit =
-    spreadflow_xslt/test/*
+    /tmp/**
+    spreadflow_xslt/test/**
+
+[report]
+omit =
+    /tmp/**
+    spreadflow_xslt/test/**

.github/workflows/python-package.yml

@@ -0,0 +1,50 @@
+---
+name: Python package
+
+on:
+  push:
+    branches: [ "stable" ]
+  pull_request:
+    branches: [ "stable" ]
+
+jobs:
+  test:
+
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.7", "3.9", "3.11"]
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip wheel
+        python -m pip install --requirement test-requirements.txt
+        python -m pip install --editable .[tests]
+    - name: Test with trial
+      run: |
+        coverage run `which trial` spreadflow_xslt
+        coverage xml
+    - name: Coveralls Parallel
+      uses: coverallsapp/github-action@v2
+      with:
+        flag-name: run-${{ join(matrix.*, '-') }}
+        format: cobertura
+        parallel: true
+
+  finish:
+    needs: test
+    if: ${{ always() }}
+    runs-on: ubuntu-latest
+    steps:
+    - name: Coveralls Finished
+      uses: coverallsapp/github-action@v2
+      with:
+        parallel-finished: true
+        carryforward: "run-3.7,run-3.9,run-3.11"

setup.py

@@ -3,8 +3,9 @@
 tests_require = [
     'SpreadFlowDelta[tests]',
     'coveralls',
+    'fixtures',
     'mock',
-    'testtools'
+    'testtools',
 ]
 
 setup(