Modified to run tests with pytest instead of unittest

.github/workflows/tests.yml

@@ -38,9 +38,9 @@ jobs:
           architecture: x64
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip setuptools numpy scipy hypothesis
+          python -m pip install --upgrade pip setuptools numpy scipy hypothesis pytest
           pip install --progress-bar off .
-      - run: python -m unittest
+      - run: python -m pytest tests --ignore=tests/test_free_threaded.py
   test-free-threaded:
     runs-on: ubuntu-latest
     steps:
@@ -55,7 +55,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip setuptools numpy hypothesis pytest pytest-freethreaded
           pip install --progress-bar off .
-      - run: python -m unittest
+      - run: python -m pytest --threads 1 --iterations 1 tests --ignore=tests/test_free_threaded.py
       # TODO: Using `unittest` style causes `pytest-freethreaded` to fail with `ConcurrencyError`.
       #       Rewriting as top-level functions works,
       #       so a follow-up is needed to refactor from `unittest` to `pytest`.
@@ -70,7 +70,7 @@ jobs:
           architecture: x64
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip setuptools scipy hypothesis
+          python -m pip install --upgrade pip setuptools scipy hypothesis pytest
           python -m pip install --pre --upgrade numpy
           pip install --progress-bar off .
-      - run: python -m unittest
+      - run: python -m pytest tests --ignore=tests/test_free_threaded.py