[tests] Avoided duplicated config admin tests + minor cleanup

Author: nemesifier

openwisp_controller/connection/tests/test_admin.py

@@ -123,3 +123,6 @@ def test_credentials_jsonschema_view(self):
         response = self.client.get(url)
         ssh_schema = json.dumps(Ssh.schema)
         self.assertIn(ssh_schema, response.content.decode('utf8'))
+
+
+del TestConfigAdmin

runtests.py

@@ -12,15 +12,18 @@
 
     args = sys.argv
     args.insert(1, 'test')
+
     if not os.environ.get('SAMPLE_APP', False):
         args.insert(2, 'openwisp_controller')
     else:
         args.insert(2, 'openwisp2')
     execute_from_command_line(args)
+
     if not os.environ.get('SAMPLE_APP', False):
         file_name = 'openwisp_controller/geo/tests'
     else:
         file_name = 'tests/openwisp2/sample_geo'
+
     return_code = subprocess.call(
         'pytest --cov=openwisp_controller --cov-append '
         f'-c tests/pytest.ini {file_name}',