diff --git a/oemof_b3/tools/testing_pipeline.py b/oemof_b3/tools/testing_pipeline.py
index 16a18591..ec3397cd 100644
--- a/oemof_b3/tools/testing_pipeline.py
+++ b/oemof_b3/tools/testing_pipeline.py
@@ -107,6 +107,7 @@ def remove_test_data(path):
     if os.path.isfile(path):
         os.remove(path)
 
+
 def get_abs_path_list(output_rule_list):
     """
     This function finds the absolut file path for each rule
@@ -130,6 +131,7 @@ def get_abs_path_list(output_rule_list):
 
     return absolute_path_list
 
+
 def pipeline_file_output_test(delete_switch, output_rule_list):
     # Loop over each rule which is tested in the snakemake pipeline
     for sublist in output_rule_list: