add test with no serial ports detected and with 2 serial ports detected

meshtastic/test/test_serial_interface.py

@@ -1,5 +1,8 @@
 """Meshtastic unit tests for serial_interface.py"""
 
+import re
+
+
 from unittest.mock import patch
 import pytest
 
@@ -8,11 +11,39 @@ from ..serial_interface import SerialInterface
 @pytest.mark.unit
 @patch('serial.Serial')
 @patch('meshtastic.util.findPorts', return_value=['/dev/ttyUSBfake'])
-def test_SerialInterface(mocked_findPorts, mocked_serial):
-    """Test that we can instantiate a SerialInterface"""
+def test_SerialInterface_single_port(mocked_findPorts, mocked_serial):
+    """Test that we can instantiate a SerialInterface with a single port"""
     iface = SerialInterface(noProto=True)
     iface.showInfo()
     iface.localNode.showInfo()
     iface.close()
     mocked_findPorts.assert_called()
     mocked_serial.assert_called()
+
+
+@pytest.mark.unit
+@patch('meshtastic.util.findPorts', return_value=[])
+def test_SerialInterface_no_ports(mocked_findPorts, capsys):
+    """Test that we can instantiate a SerialInterface with no ports"""
+    with pytest.raises(SystemExit) as pytest_wrapped_e:
+        SerialInterface(noProto=True)
+    mocked_findPorts.assert_called()
+    assert pytest_wrapped_e.type == SystemExit
+    assert pytest_wrapped_e.value.code == 1
+    out, err = capsys.readouterr()
+    assert re.search(r'Warning: No Meshtastic devices detected', out, re.MULTILINE)
+    assert err == ''
+
+
+@pytest.mark.unit
+@patch('meshtastic.util.findPorts', return_value=['/dev/ttyUSBfake1', '/dev/ttyUSBfake2'])
+def test_SerialInterface_multiple_ports(mocked_findPorts, capsys):
+    """Test that we can instantiate a SerialInterface with two ports"""
+    with pytest.raises(SystemExit) as pytest_wrapped_e:
+        SerialInterface(noProto=True)
+    mocked_findPorts.assert_called()
+    assert pytest_wrapped_e.type == SystemExit
+    assert pytest_wrapped_e.value.code == 1
+    out, err = capsys.readouterr()
+    assert re.search(r'Warning: Multiple serial ports were detected', out, re.MULTILINE)
+    assert err == ''