fixes for working on mac air

meshtastic/tests/test_ble_interface.py

@@ -1,12 +1,14 @@
 """Meshtastic unit tests for ble_interface.py"""
 
 
+from unittest.mock import patch
 import pytest
 
 from ..ble_interface import BLEInterface
 
 @pytest.mark.unit
-def test_BLEInterface():
+@patch('platform.system', return_value='Linux')
+def test_BLEInterface(mock_platform):
     """Test that we can instantiate a BLEInterface"""
     iface = BLEInterface('foo', debugOut=True, noProto=True)
     iface.close()