Physical device tests.

docs/usage.rst

@@ -24,6 +24,7 @@ Start the serial multiplexer on a serial device, e.g., ``/dev/ttyUSB0``.
       Virtual serial device 1: /dev/pts/8
       Virtual serial device 2: /dev/pts/9
 
+    Press Ctrl+C to exit.
 
 Usage
 -----
@@ -44,9 +45,9 @@ second virtual serial device.
 ::
 
     $ picocom -q /dev/pts/9
-    System time: 3432
-    System time: 6860
-    System time: 10290
+    time: 3432
+    time: 6860
+    time: 10290
 
 
 .. _sketch: https://github.com/jfjlaros/serialMux/blob/master/examples/demo/demo.ino

serial_mux/cli.py

@@ -19,7 +19,7 @@ def serial_mux(
     """
     mux = SerialMux(device, baudrate, wait, log_handle)
     threads = [Thread(target=mux.update, daemon=True)]
-    threads[-1].start()
+    threads[0].start()
 
     handle.write('Detected {} virtual serial ports.\n'.format(
         len(mux.devices)))

tests/test_device.py

@@ -0,0 +1,33 @@
+from os.path import exists
+from pytest import mark
+from serial import Serial
+from time import sleep
+
+from serial_mux import SerialMux
+from sys import stderr
+
+
+_device = '/dev/ttyUSB0'
+
+
+@mark.skipif(not exists(_device), reason='device not connected')
+class TestDevice(object):
+    if exists(_device):
+        _mux = SerialMux(_device)
+
+    def test_ports(self: object) -> None:
+        assert len(self._mux.devices) == 2
+
+    def test_device1(self: object) -> None:
+        serial = Serial(self._mux.devices[0].name)
+        serial.write(b'\x01')
+        self._mux.devices[0]._update()
+        for _ in range(64):
+            self._mux._update()
+
+        assert serial.read(11) == b'received: 1'
+
+    def test_device2(self: object) -> None:
+        in_handle = open(self._mux.devices[1].name, 'rb')
+        self._mux._update()
+        assert in_handle.read(6) == b'time: '