changed way to get enviroment variable

tangostationcontrol/tangostationcontrol/integration_test/default/devices/test_observation.py

@@ -6,6 +6,7 @@ from tangostationcontrol.integration_test import base
 from tangostationcontrol.devices.observation_control import observation_wrapper
 from tangostationcontrol.integration_test.device_proxy import TestDeviceProxy
 import numpy
+from os import environ
 
 from json import loads
 
@@ -25,7 +26,7 @@ class TestObservation(base.IntegrationTestCase):
         specification_dict = loads(TestObservationBase.VALID_JSON)
 
         # create an observation class using the dict and as host just get it using a util function
-        observation = observation_wrapper(specification=specification_dict, host=ApiUtil.get_env_var("TANGO_HOST"))
+        observation = observation_wrapper(specification=specification_dict, host=environ["TANGO_HOST"])
 
         # Assert the observation is running after starting it
         observation.start()