Adding Python 3.14 testing to CI

Author: palemieux

.github/workflows/main.yml

@@ -4,24 +4,29 @@ on: [push, pull_request]
 
 jobs:
   run:
+    name: "Test"
+    strategy:
+      matrix:
+        python_version: ["3.7", "3.14"]
     runs-on: ubuntu-22.04
     if: github.event_name == 'push' || (github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != github.repository)
     steps:
 
-    - uses: actions/setup-python@v4
+    - uses: actions/setup-python@v6
       with:
-        python-version: '3.7'
+        python-version: ${{ matrix.python_version }}
 
     - name: Initialize pip environment
       run: python -m pip install pipenv
 
     - name: Checkout repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v5
       with:
         submodules : true
 
     - name: Install python environment
-      run: pipenv install --dev 
+      run: |
+        pipenv install --dev --skip-lock --python ${{ matrix.python_version }}
 
     - name: Run CI
       env:

src/main/python/ttconv/filters/isd_filter.py

@@ -30,6 +30,6 @@
 class ISDFilter:
   """Abstract base class for filters"""
 
-  def process(self, isd: ISD):
+  def process(self, isd: ISD): # pragma: no cover
     """Process the specified ISD and returns it."""
     raise NotImplementedError