#285 Pair each Python version with a specific sympy version in CI

Author: kwabenantim

.github/workflows/pytest.yml

@@ -4,8 +4,19 @@ jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
-        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
+        include:
+          - python-version: "3.10"
+            sympy-version: "1.10"
+          - python-version: "3.11"
+            sympy-version: "1.11"
+          - python-version: "3.12"
+            sympy-version: "1.12"
+          - python-version: "3.13"
+            sympy-version: "1.13"
+          - python-version: "3.14"
+            sympy-version: "1.14"
     steps:
     - name: Checkout repository and submodules
       uses: actions/checkout@v7
@@ -20,6 +31,7 @@ jobs:
         python3 -m pip install --upgrade pip
         python3 -m pip install flake8 pytest
         python3 -m pip install .[test]
+        python3 -m pip install "sympy==${{ matrix.sympy-version }}"
     - name: Lint with flake8
       run: |
         python3 -m flake8