diff --git a/unittests/test_variable_substitutions.py b/unittests/test_variable_substitutions.py
index 1e4aa21b3c5c848a27051633b5f8f214d1ca8cd5..203197b7f8af51605a413ac354a0426d61c9c0cb 100644
--- a/unittests/test_variable_substitutions.py
+++ b/unittests/test_variable_substitutions.py
@@ -39,6 +39,7 @@ def crawler():
                             rfp("test_directories", "example_substitutions", "substitutions.yml"))
     return crawler
 
+
 @pytest.fixture
 def crawler_2():
     crawler = Crawler(debug=True)
@@ -68,12 +69,13 @@ def test_substitutions(crawler):
         assert subd[i]["Project"].get_property(
             "dates").value[0] == "2022-05-12"
 
+
 def test_substitutions_parents(crawler_2):
     # This is a test for:
     # https://gitlab.indiscale.com/caosdb/src/caosdb-crawler/-/issues/35
     # ... testing whether variable substitutions can be used in parent declarations.
     subd = crawler_2.debug_tree[dircheckstr(
-            "File", "ExperimentalData", "220512_data.dat")]
+        "File", "ExperimentalData", "220512_data.dat")]
     # subd[0] <- generalStore
     # subd[1] <- recordStore