diff --git a/test/crossrunner/__init__.py b/test/crossrunner/__init__.py
index 49025ed..9d0b83a 100644
--- a/test/crossrunner/__init__.py
+++ b/test/crossrunner/__init__.py
@@ -17,7 +17,7 @@
 # under the License.
 #
 
-from .test import test_name
-from .collect import collect_cross_tests, collect_feature_tests
-from .run import TestDispatcher
-from .report import generate_known_failures, load_known_failures
+from .test import test_name  # noqa
+from .collect import collect_cross_tests, collect_feature_tests  # noqa
+from .run import TestDispatcher  # noqa
+from .report import generate_known_failures, load_known_failures  # noqa
diff --git a/test/crossrunner/run.py b/test/crossrunner/run.py
index 3f9aaa4..f522bb1 100644
--- a/test/crossrunner/run.py
+++ b/test/crossrunner/run.py
@@ -37,6 +37,10 @@
 RESULT_TIMEOUT = 128
 RESULT_ERROR = 64
 
+# globals
+ports = None
+stop = None
+
 
 class ExecutionContext(object):
     def __init__(self, cmd, cwd, env, report):
diff --git a/test/crossrunner/setup.cfg b/test/crossrunner/setup.cfg
new file mode 100644
index 0000000..7da1f96
--- /dev/null
+++ b/test/crossrunner/setup.cfg
@@ -0,0 +1,2 @@
+[flake8]
+max-line-length = 100