Add transport policy config

tests/test_config.py

@@ -0,0 +1,74 @@
+from __future__ import annotations
+
+import tempfile
+import unittest
+from pathlib import Path
+
+from ampbrowser.config import ConfigError, load_config
+
+
+class ConfigTest(unittest.TestCase):
+    def test_missing_config_uses_defaults(self) -> None:
+        with tempfile.TemporaryDirectory() as tmp:
+            config = load_config(Path(tmp))
+
+        self.assertEqual(".ampb", config.state_dir)
+        self.assertEqual("adopt-or-prompt-manage", config.transport_mode("tor"))
+        self.assertEqual(".ampb/profiles/tor", config.profile_path("tor"))
+
+    def test_loads_transport_modes_and_state_dir(self) -> None:
+        with tempfile.TemporaryDirectory() as tmp:
+            path = Path(tmp) / "config.toml"
+            path.write_text(
+                """
+[browser]
+state_dir = ".local/ampb"
+
+[transports.tor]
+mode = "adopt"
+
+[transports.i2p]
+enabled = false
+""".strip(),
+                encoding="utf-8",
+            )
+
+            config = load_config(Path(tmp), path)
+
+        self.assertEqual(".local/ampb", config.state_dir)
+        self.assertEqual("adopt", config.transport_mode("tor"))
+        self.assertEqual("disabled", config.transport_mode("i2p"))
+        self.assertEqual(".local/ampb/profiles/i2p", config.profile_path("i2p"))
+
+    def test_accepts_adopt_or_manage_alias(self) -> None:
+        with tempfile.TemporaryDirectory() as tmp:
+            path = Path(tmp) / "config.toml"
+            path.write_text(
+                """
+[transports.tor]
+mode = "adopt-or-manage"
+""".strip(),
+                encoding="utf-8",
+            )
+
+            config = load_config(Path(tmp), path)
+
+        self.assertEqual("adopt-or-prompt-manage", config.transport_mode("tor"))
+
+    def test_rejects_unknown_mode(self) -> None:
+        with tempfile.TemporaryDirectory() as tmp:
+            path = Path(tmp) / "config.toml"
+            path.write_text(
+                """
+[transports.tor]
+mode = "surprise"
+""".strip(),
+                encoding="utf-8",
+            )
+
+            with self.assertRaises(ConfigError):
+                load_config(Path(tmp), path)
+
+
+if __name__ == "__main__":
+    unittest.main()