diff --git a/unittests/test_scanner.py b/unittests/test_scanner.py
index 52aa18f4d6e3849bf4de037e1f6069e2965cb91f..6aa7287b2449f49706cb352d24fa8abf66f87115 100644
--- a/unittests/test_scanner.py
+++ b/unittests/test_scanner.py
@@ -35,15 +35,15 @@ from utils import dircheckstr as dircheck_base
 
 UNITTESTDIR = Path(__file__).parent
 
-dircheckstr = partial(dircheck_base, UNITTESTDIR/"test_directories" / "examples_article")
+dircheckstr = partial(dircheck_base, UNITTESTDIR / "test_directories" / "examples_article")
 
 
 def test_scan_structure_elements():
     tmpfi = NamedTemporaryFile(delete=False)
-    with open(UNITTESTDIR/"example_datastructure.yml", "r") as f:
+    with open(UNITTESTDIR / "example_datastructure.yml", "r") as f:
         data = yaml.load(f, Loader=yaml.SafeLoader)
 
-    crawler_definition = load_definition(UNITTESTDIR/"example_cfood.yml")
+    crawler_definition = load_definition(UNITTESTDIR / "example_cfood.yml")
     converter_registry = create_converter_registry(crawler_definition)
     recs = scan_structure_elements(DictElement(name="", value=data), crawler_definition,
                                    converter_registry)
@@ -54,10 +54,10 @@ def test_provenance_debug_data():
     # TODO rewrite the test to use a smaller example setup
     tmpfi = NamedTemporaryFile(delete=False)
     debug_tree = DebugTree()
-    with open(UNITTESTDIR/"example_datastructure.yml", "r") as f:
+    with open(UNITTESTDIR / "example_datastructure.yml", "r") as f:
         data = yaml.load(f, Loader=yaml.SafeLoader)
 
-    crawler_definition = load_definition(UNITTESTDIR/"example_cfood.yml")
+    crawler_definition = load_definition(UNITTESTDIR / "example_cfood.yml")
     converter_registry = create_converter_registry(crawler_definition)
     stuff = scan_structure_elements(DictElement(name="", value=data), crawler_definition,
                                     converter_registry, debug_tree=debug_tree)
@@ -83,8 +83,8 @@ def test_record_structure_generation():
     # TODO test creation of debug information in a separate test
 
     dbt = DebugTree()
-    scan_directory(UNITTESTDIR/"test_directories" / "examples_article",
-                   UNITTESTDIR/"scifolder_cfood.yml",
+    scan_directory(UNITTESTDIR / "test_directories" / "examples_article",
+                   UNITTESTDIR / "scifolder_cfood.yml",
                    debug_tree=dbt)
     subd = dbt.debug_tree[dircheckstr("DataAnalysis")]
     subc = dbt.debug_metadata["copied"][dircheckstr("DataAnalysis")]
@@ -174,13 +174,13 @@ def test_record_generation():
     Test the correct list of returned records by the scanner using the
     scifolder example from the article.
     """
-    
-    records = scan_directory(UNITTESTDIR/"test_directories" / "examples_article",
-                             UNITTESTDIR/"scifolder_cfood.yml")
+
+    records = scan_directory(UNITTESTDIR / "test_directories" / "examples_article",
+                             UNITTESTDIR / "scifolder_cfood.yml")
 
     def parent_filter(parent_name):
         return [p for p in records if len(p.parents) == 1 and p.parents[0].name == parent_name]
-    
+
     def check_properties(records, check_props, check_additional=True):
         records_found = [0 for r in check_props]
         for rec in records: