diff --git a/test/pyrostest/test_nodes.py b/test/pyrostest/test_nodes.py
index 6bb270a..e687cba 100644
--- a/test/pyrostest/test_nodes.py
+++ b/test/pyrostest/test_nodes.py
@@ -2,6 +2,7 @@
 
 import pyrostest
 
+
 class TestAddOne(pyrostest.RosTest):
     @pyrostest.launch_node('pyrostest', 'add_one.py')
     def test_add_one_node_single(self):
@@ -26,6 +27,7 @@ def test_unused_node(self):
             with self.check_topic('/pyrostest/add_one', Int32) as out:
                 pass
 
+
 class TestPubFoo(pyrostest.RosTest):
     @pyrostest.with_launch_file('pyrostest', 'launch.launch')
     @pyrostest.launch_node('pyrostest', 'pub_foo.py')
@@ -33,6 +35,7 @@ def test_foo_node(self):
         with self.check_topic('/pub_val', Int32) as out:
             assert out.message.data == 7
 
+
 class TestSequence(pyrostest.RosTest):
     @pyrostest.with_launch_file('pyrostest', 'launch.launch')
     @pyrostest.launch_node('pyrostest', 'pub_foo.py')