Add and debug PyBaMM test suite

.github/workflows/test_suite.yml

@@ -0,0 +1,41 @@
+name: How much does the test suite pass with PyBaMM wheels?
+
+on:
+  workflow_dispatch:
+  pull_request:
+
+env:
+  FORCE_COLOR: 3
+
+jobs:
+  run_unit_tests:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        python-version: ["3.11"]
+        pybamm-version: ["23.9", "24.1"]
+    name: Run test suite / ${{ matrix.os }} / py-${{ matrix.python-version }}
+
+    steps:
+      - name: Set up Python ${{ matrix.python-version }}
+        id: setup-python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install PyBaMM wheels
+        run: python -m pip install "pybamm[all,dev]==${{ matrix.pybamm-version }}"
+
+      - name: Checkout tests from PyBaMM repository
+        uses: actions/checkout@v4
+        with:
+          repository: pybamm-team/PyBaMM
+          ref: '${{ matrix.pybamm-version }}'
+          sparse-checkout: |
+            tests
+          sparse-checkout-cone-mode: true
+
+      - name: Run unit tests and integration tests with unittest
+        run: python -m unittest discover -s tests --verbose