Add a test using pytest-freethreaded

.github/workflows/tests.yml

@@ -53,9 +53,10 @@ jobs:
           nogil: true
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip setuptools numpy hypothesis
+          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 --require-gil-disabled tests/test_free_threaded.py
   test-numpy2:
     runs-on: ubuntu-latest
     steps:

tests/test_free_threaded.py

@@ -0,0 +1,22 @@
+import numpy as np
+import pytest
+from cmaes import CMA
+
+
+@pytest.mark.freethreaded(threads=10, iterations=200)
+def test_simple_optimization():
+    optimizer = CMA(mean=np.zeros(2), sigma=1.3)
+
+    def quadratic(x1: float, x2: float) -> float:
+        return (x1 - 3) ** 2 + (10 * (x2 + 2)) ** 2
+
+    while True:
+        solutions = []
+        for _ in range(optimizer.population_size):
+            x = optimizer.ask()
+            value = quadratic(x[0], x[1])
+            solutions.append((x, value))
+        optimizer.tell(solutions)
+
+        if optimizer.should_stop():
+            break