Move to multi-connection modality

tests/test_config.py

@@ -0,0 +1,82 @@
+"""Tests for configuration validation.
+
+These tests verify transport mutual exclusivity, BLE PIN requirement,
+and connection_type derivation.
+"""
+
+import pytest
+from pydantic import ValidationError
+
+from app.config import Settings
+
+
+class TestTransportExclusivity:
+    """Ensure only one transport can be configured at a time."""
+
+    def test_no_transport_defaults_to_serial(self):
+        """No transport env vars means serial auto-detect."""
+        s = Settings(serial_port="", tcp_host="", ble_address="")
+        assert s.connection_type == "serial"
+
+    def test_serial_only(self):
+        s = Settings(serial_port="/dev/ttyUSB0")
+        assert s.connection_type == "serial"
+
+    def test_tcp_only(self):
+        s = Settings(tcp_host="192.168.1.1")
+        assert s.connection_type == "tcp"
+
+    def test_tcp_with_custom_port(self):
+        s = Settings(tcp_host="192.168.1.1", tcp_port=5000)
+        assert s.connection_type == "tcp"
+        assert s.tcp_port == 5000
+
+    def test_tcp_default_port(self):
+        s = Settings(tcp_host="192.168.1.1")
+        assert s.tcp_port == 4000
+
+    def test_ble_only(self):
+        s = Settings(ble_address="AA:BB:CC:DD:EE:FF", ble_pin="123456")
+        assert s.connection_type == "ble"
+
+    def test_serial_and_tcp_rejected(self):
+        with pytest.raises(ValidationError, match="Only one transport"):
+            Settings(serial_port="/dev/ttyUSB0", tcp_host="192.168.1.1")
+
+    def test_serial_and_ble_rejected(self):
+        with pytest.raises(ValidationError, match="Only one transport"):
+            Settings(
+                serial_port="/dev/ttyUSB0",
+                ble_address="AA:BB:CC:DD:EE:FF",
+                ble_pin="123456",
+            )
+
+    def test_tcp_and_ble_rejected(self):
+        with pytest.raises(ValidationError, match="Only one transport"):
+            Settings(
+                tcp_host="192.168.1.1",
+                ble_address="AA:BB:CC:DD:EE:FF",
+                ble_pin="123456",
+            )
+
+    def test_all_three_rejected(self):
+        with pytest.raises(ValidationError, match="Only one transport"):
+            Settings(
+                serial_port="/dev/ttyUSB0",
+                tcp_host="192.168.1.1",
+                ble_address="AA:BB:CC:DD:EE:FF",
+                ble_pin="123456",
+            )
+
+
+class TestBLEPinRequirement:
+    """BLE address requires a PIN."""
+
+    def test_ble_address_without_pin_rejected(self):
+        with pytest.raises(ValidationError, match="MESHCORE_BLE_PIN is required"):
+            Settings(ble_address="AA:BB:CC:DD:EE:FF", ble_pin="")
+
+    def test_ble_address_with_pin_accepted(self):
+        s = Settings(ble_address="AA:BB:CC:DD:EE:FF", ble_pin="123456")
+        assert s.ble_address == "AA:BB:CC:DD:EE:FF"
+        assert s.ble_pin == "123456"