Enforce fixture interaction policy

tests/test_interaction_policy.py

@@ -0,0 +1,36 @@
+from __future__ import annotations
+
+import unittest
+
+from ampbrowser.interaction_policy import interaction_failures
+
+
+class InteractionPolicyTest(unittest.TestCase):
+    def test_static_ipfs_is_allowed(self) -> None:
+        self.assertEqual(
+            [],
+            interaction_failures(
+                "ipfs",
+                tier="static",
+                identity="none",
+                payments="none",
+                realtime=False,
+                public_allowed=True,
+            ),
+        )
+
+    def test_public_allowed_false_fails(self) -> None:
+        failures = interaction_failures(
+            "tor",
+            tier="static",
+            identity="none",
+            payments="none",
+            realtime=False,
+            public_allowed=False,
+        )
+
+        self.assertEqual(["fixture is not public_allowed"], failures)
+
+
+if __name__ == "__main__":
+    unittest.main()