diff --git a/src/caoscrawler/transformer_functions.py b/src/caoscrawler/transformer_functions.py
index 6b2fa57d056bef43e8ea8574c6314c0155a1e5e5..8901c2f53bcfbfb28333887a98576e67cff81386 100644
--- a/src/caoscrawler/transformer_functions.py
+++ b/src/caoscrawler/transformer_functions.py
@@ -30,7 +30,7 @@ from typing import Any
 def submatch(in_value: Any, in_parameters: dict):
     """
     Substitute the variable if it matches the regexp stored in "match".
-    
+
     Returns the "in" value if it does NOT match the reg exp of 'match'.
     Otherwise (if it matches) the value of 'then' stored in the second argument is returned.
     """
diff --git a/unittests/test_converters.py b/unittests/test_converters.py
index 35851a7aaf5ec5b9991b951b3f4ea100eccdf77b..42b078eb31c4bdfb0bdeea3d2a0b4fe1c4404ca7 100644
--- a/unittests/test_converters.py
+++ b/unittests/test_converters.py
@@ -168,7 +168,7 @@ def test_markdown_converter(converter_registry):
 
     test_readme2 = File(
         "README.md",
-        UNITTESTDIR/"test_directories" / "examples_article" /
+        UNITTESTDIR / "test_directories" / "examples_article" /
         "ExperimentalData" / "2020_SpeedOfLight" / "2020-01-01_TimeOfFlight" / "README.md"
     )
 
@@ -246,7 +246,7 @@ def test_json_converter(converter_registry):
 
     invalid_json = File(
         "invalidjson.json",
-        UNITTESTDIR/"test_directories" / "examples_json" / "invalidjson.json"
+        UNITTESTDIR / "test_directories" / "examples_json" / "invalidjson.json"
     )
     # Doesn't validate because of missing required 'name' property
     with pytest.raises(ConverterValidationError) as err:
@@ -255,7 +255,7 @@ def test_json_converter(converter_registry):
 
     broken_json = File(
         "brokenjson.json",
-        UNITTESTDIR/"test_directories" / "examples_json" / "brokenjson.json"
+        UNITTESTDIR / "test_directories" / "examples_json" / "brokenjson.json"
     )
     with pytest.raises(json.decoder.JSONDecodeError) as err:
         jsonconverter.create_children(None, broken_json)
@@ -320,7 +320,7 @@ def test_yaml_converter(converter_registry):
 
     invalid_yaml = File(
         "invalidyaml.yml",
-        UNITTESTDIR/"test_directories" / "test_yamls" / "invalidyaml.yml"
+        UNITTESTDIR / "test_directories" / "test_yamls" / "invalidyaml.yml"
     )
 
     # Doesn't validate because of missing required 'name' property
@@ -330,7 +330,7 @@ def test_yaml_converter(converter_registry):
 
     broken_yaml = File(
         "brokenyaml.yml",
-        UNITTESTDIR/"test_directories" / "test_yamls" / "brokenyaml.yml"
+        UNITTESTDIR / "test_directories" / "test_yamls" / "brokenyaml.yml"
     )
     with pytest.raises(yaml.parser.ParserError) as err:
         yamlconverter.create_children(None, broken_yaml)
@@ -379,7 +379,7 @@ def test_apply_transformers(converter_registry):
     values["a"] = "a|b|c"
 
     # transformer_functions  = create_transformer_registry(crawler_definition)
-    transformer_functions = {"split":  split}
+    transformer_functions = {"split": split}
 
     conv = ListElementConverter(definition=cfood_def, name='test',
                                 converter_registry=converter_registry)
diff --git a/unittests/test_scalars_cfood.py b/unittests/test_scalars_cfood.py
index 57a8083c2aace830115c410e0425a8af4da17a7b..ba604fe4f5b695506bf8df9dab79fc23232c546a 100644
--- a/unittests/test_scalars_cfood.py
+++ b/unittests/test_scalars_cfood.py
@@ -37,11 +37,11 @@ def test_handle_value():
 
 def test_record_structure_generation():
     dbt = DebugTree()
-    scan_directory(UNITTESTDIR/"test_directories" / "examples_article",
-                   UNITTESTDIR/"cfoods_scalar.yml",
+    scan_directory(UNITTESTDIR / "test_directories" / "examples_article",
+                   UNITTESTDIR / "cfoods_scalar.yml",
                    debug_tree=dbt)
     subd = dbt.debug_tree[dircheckstr(
-        UNITTESTDIR/"test_directories" / "examples_article", "DataAnalysis")]
+        UNITTESTDIR / "test_directories" / "examples_article", "DataAnalysis")]
     assert len(subd) == 2
     # variables store on Data Analysis node of debug tree
     if "Data" in subd[0]:
diff --git a/unittests/test_variable_substitutions.py b/unittests/test_variable_substitutions.py
index 9d1981c773e481e78eb4f82e785e27ee8f8d00d6..09f78df661d82970e7264996102eff8881ee19ec 100644
--- a/unittests/test_variable_substitutions.py
+++ b/unittests/test_variable_substitutions.py
@@ -41,7 +41,7 @@ from pytest import raises
 from utils import dircheckstr as dircheckstr_base
 
 UNITTESTDIR = Path(__file__).parent
-dircheckstr = partial(dircheckstr_base, UNITTESTDIR/"test_directories" /
+dircheckstr = partial(dircheckstr_base, UNITTESTDIR / "test_directories" /
                       "example_substitutions")