Local Unit TUN Testing With Monitor Class Fails

[kb1lqc]

Likely due to threading, the unit testing fails when run locally but apparently passes both on Travis-CI builds as well as when I run each TUN test case individually. See below:

Pytest Failures

(.venv) bryce@bryce-ubuntu:~/Documents/git/faradayio$ sudo .venv/bin/python3 -m pytest
============================= test session starts ==============================
platform linux -- Python 3.5.2, pytest-3.3.2, py-1.5.2, pluggy-0.6.0
rootdir: /home/bryce/Documents/git/faradayio, inifile:
plugins: cov-2.5.1
collected 37 items                                                             

tests/test_serial.py .................................                   [ 89%]
tests/test_tun.py ...F                                                   [100%]

=================================== FAILURES ===================================
_______________________________ test_serialToTUN _______________________________

    def test_serialToTUN():
        """
        Test serial port to TUN link. Don't need a serial port but just assume that
        an IP packet was received from the serial port and properly decoded with
        SLIP. Send it to the TUN and verify that the IP:PORT receives the message.
        """
        # Create a test serial port for TUN Monitor class. Won't be used.
        serialInstance = faraday.SerialTestClass()
        serialPort = serialInstance.serialPort
    
        # Configure TUN IP:PORT and IP Packet source IP:PORT parameters for test
        sourceAddress = '10.0.0.2'
        sourcePort = 9998
        destPort = 9999
    
        # Start a TUN Monitor class
        isRunning = threading.Event()
        isRunning.set()
        TUNMonitor = faraday.Monitor(serialPort=serialPort,
>                                    isRunning=isRunning)

tests/test_tun.py:163: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
faradayio/faraday.py:146: in __init__
    mtu=mtu)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <faradayio.faraday.TunnelServer object at 0x7fb688fe04a8>
addr = '10.0.0.1', netmask = '255.255.255.0', mtu = 1500, name = 'Faraday'

    def __init__(self, addr,
                 netmask,
                 mtu,
                 name):
>       self._tun = pytun.TunTapDevice(name=name)
E       pytun.Error: [Errno 16] Device or resource busy

faradayio/faraday.py:99: Error
===================== 1 failed, 36 passed in 0.51 seconds ======================
TUN brought down...
Exception ignored in: <bound method TunnelServer.__del__ of <faradayio.faraday.TunnelServer object at 0x7fb688fe04a8>>
Traceback (most recent call last):
  File "/home/bryce/Documents/git/faradayio/faradayio/faraday.py", line 112, in __del__
AttributeError: 'TunnelServer' object has no attribute '_tun'

Individual Test Cases

(.venv) bryce@bryce-ubuntu:~/Documents/git/faradayio$ sudo .venv/bin/python3 -m pytest -k serialToTUN
============================= test session starts ==============================
platform linux -- Python 3.5.2, pytest-3.3.2, py-1.5.2, pluggy-0.6.0
rootdir: /home/bryce/Documents/git/faradayio, inifile:
plugins: cov-2.5.1
collected 37 items                                                             

tests/test_tun.py .                                                      [100%]

============================= 36 tests deselected ==============================
=================== 1 passed, 36 deselected in 0.33 seconds ====================

@hdkmike @reillyeon @lqdev This is an interesting observation. Any thoughts? Am I correct in suspecting the Monitor class (which inherits Threading.Thread) is suspect?