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import time

import pytest

from obd import commands, Unit

# NOTE: This is purposefully tuned slightly higher than the ELM's default

# message timeout of 200 milliseconds. This prevents us from

# inadvertently marking the first query of an async connection as

# null, since it may be the case that the first transaction incurs the

# ELM's internal timeout.

STANDARD_WAIT_TIME = 0.3

@pytest.fixture(scope="module")

def obd(request):

"""provides an OBD connection object for obdsim"""

import obd

port = request.config.getoption("--port")

return obd.OBD(port)

@pytest.fixture(scope="module")

def asynchronous(request):

"""provides an OBD *Async* connection object for obdsim"""

import obd

port = request.config.getoption("--port")

return obd.Async(port)

def good_rpm_response(r):

return (not r.is_null()) and \

(r.value.u == Unit.rpm) and \

(r.value >= 0.0 * Unit.rpm)

@pytest.fixture

def skip_if_port_unspecified(request):

if not request.config.getoption("--port"):

pytest.skip("needs --port=<port> to run")

def test_supports(skip_if_port_unspecified, obd):

assert (len(obd.supported_commands) > 0)

assert (obd.supports(commands.RPM))

def test_rpm(skip_if_port_unspecified, obd):

r = obd.query(commands.RPM)

assert (good_rpm_response(r))

# Async tests

def test_async_query(skip_if_port_unspecified, asynchronous):

rs = []

asynchronous.watch(commands.RPM)

asynchronous.start()

for i in range(5):

time.sleep(STANDARD_WAIT_TIME)

rs.append(asynchronous.query(commands.RPM))

asynchronous.stop()

asynchronous.unwatch_all()

# make sure we got data

assert (len(rs) > 0)

assert (all([good_rpm_response(r) for r in rs]))

def test_async_callback(skip_if_port_unspecified, asynchronous):

rs = []

asynchronous.watch(commands.RPM, callback=rs.append)

asynchronous.start()

time.sleep(STANDARD_WAIT_TIME)

asynchronous.stop()

asynchronous.unwatch_all()

# make sure we got data

assert (len(rs) > 0)

assert (all([good_rpm_response(r) for r in rs]))

def test_async_paused(skip_if_port_unspecified, asynchronous):

assert (not asynchronous.running)

asynchronous.watch(commands.RPM)

asynchronous.start()

assert asynchronous.running

with asynchronous.paused() as was_running:

assert not asynchronous.running

assert was_running

assert asynchronous.running

asynchronous.stop()

assert not asynchronous.running

def test_async_unwatch(skip_if_port_unspecified, asynchronous):

watched_rs = []

unwatched_rs = []

asynchronous.watch(commands.RPM)

asynchronous.start()

for i in range(5):

time.sleep(STANDARD_WAIT_TIME)

watched_rs.append(asynchronous.query(commands.RPM))

with asynchronous.paused():

asynchronous.unwatch(commands.RPM)

for i in range(5):

time.sleep(STANDARD_WAIT_TIME)

unwatched_rs.append(asynchronous.query(commands.RPM))

asynchronous.stop()

# the watched commands

assert (len(watched_rs) > 0)

assert (all([good_rpm_response(r) for r in watched_rs]))

# the unwatched commands

assert (len(unwatched_rs) > 0)

assert (all([r.is_null() for r in unwatched_rs]))

def test_async_unwatch_callback(skip_if_port_unspecified, asynchronous):

a_rs = []

b_rs = []

asynchronous.watch(commands.RPM, callback=a_rs.append)

asynchronous.watch(commands.RPM, callback=b_rs.append)

asynchronous.start()

time.sleep(STANDARD_WAIT_TIME)

with asynchronous.paused():

asynchronous.unwatch(commands.RPM, callback=b_rs.append)

time.sleep(STANDARD_WAIT_TIME)

asynchronous.stop()

asynchronous.unwatch_all()

assert (all([good_rpm_response(r) for r in a_rs + b_rs]))

assert (len(a_rs) > len(b_rs))