.

nessclient_tests/test_client.py

@@ -55,8 +55,11 @@ async def test_aux_off(connection, client):
 async def test_update(connection, client):
     await client.update()
     assert connection.write.call_count == 2
-    assert get_data(connection.write.call_args_list[0][0][0]) == b'S00'
-    assert get_data(connection.write.call_args_list[1][0][0]) == b'S14'
+    commands = {
+        get_data(connection.write.call_args_list[0][0][0]),
+        get_data(connection.write.call_args_list[1][0][0])
+    }
+    assert commands == {b'S00', b'S14'}
 
 
 @pytest.mark.asyncio

setup.py

@@ -1,4 +1,5 @@
 import os
+import sys
 
 from setuptools import setup
 
@@ -24,6 +25,9 @@ def get_version():
 except Exception:
     version = '0.0.0-dev'
 
+needs_pytest = {'pytest', 'test', 'ptr'}.intersection(sys.argv)
+pytest_runner = ['pytest-runner'] if needs_pytest else []
+
 setup(
     name='nessclient',
     version=version,
@@ -51,6 +55,6 @@ def get_version():
         'console_scripts': ['ness-cli=nessclient.cli.__main__:cli'],
     },
     test_suite='nessclient_tests',
-    setup_requires=['pytest-runner'],
-    tests_require=['pytest', 'pytest-asyncio', 'asynctest'],
+    setup_requires=[] + pytest_runner,
+    tests_require=['pytest==4.3.0', 'pytest-asyncio', 'asynctest'],
 )