test: add pytest baseline

tests/test_project_setup.py

@@ -0,0 +1,8 @@
+from pathlib import Path
+
+
+def test_requirements_pin_test_framework():
+    requirements = Path("requirements.txt").read_text(encoding="utf-8").splitlines()
+
+    assert "Flask==3.0.3" in requirements
+    assert "pytest==8.3.5" in requirements