Add testing CI (#12)

* Commit

* Include more python versions in the matrix

* Enable workflow for PRs

---------

Co-authored-by: Bodo Graumann <mail@bodograumann.de>

Author: StanFromIreland

.github/workflows/test.yml

@@ -0,0 +1,41 @@
+name: Test
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ["ubuntu-latest", "windows-latest", "macos-latest"]
+        python-version: ['3.6', '3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13', '3.14']
+
+    steps:
+    - uses: actions/checkout@v5
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v6
+      with:
+        python-version: ${{ matrix.python-version }}
+        allow-prereleases: true
+
+    - name: Install dependencies
+      if: runner.os == 'macOS'
+      run: brew install libiconv
+
+    - name: Install package
+      run: |
+        python -m pip install --upgrade pip
+        pip install -e .
+
+    - name: Run tests
+      run: |
+        python -m unittest -v