ci: install aiohttp for route tests

.github/workflows/validate.yml

@@ -26,7 +26,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           python -m pip install --index-url https://download.pytorch.org/whl/cpu "torch>=2.5,<3"
-          python -m pip install "numpy>=1.26,<3" "Pillow>=10,<13" "jsonschema>=4.20,<5"
+          python -m pip install "aiohttp>=3.10,<4" "numpy>=1.26,<3" "Pillow>=10,<13" "jsonschema>=4.20,<5"
 
       - name: Validate Python syntax
         run: python -m compileall -q __init__.py py

tests/test_ci_workflow.py

@@ -0,0 +1,15 @@
+import unittest
+from pathlib import Path
+
+
+class CiWorkflowTests(unittest.TestCase):
+    def test_python_route_test_dependencies_are_installed(self):
+        workflow = (
+            Path(__file__).parents[1] / ".github" / "workflows" / "validate.yml"
+        ).read_text(encoding="utf-8")
+
+        self.assertIn('"aiohttp>=3.10,<4"', workflow)
+
+
+if __name__ == "__main__":
+    unittest.main()